Mass distributions of different soil organic carbon (SOC) fractions are influenced by land use and management. Concentrations of C and N in light- and heavy fractions of bulk soils and aggregates in 0–20 cm were determined to evaluate the role of aggregation in SOC sequestration under conventional tillage (CT), no-till (NT), and forest treatments. Light- and heavy fractions of SOC were separated using 1.85 g mL−1 sodium polytungstate solution. Soils under forest and NT preserved, respectively, 167% and 94% more light fraction than those under CT. The mass of light fraction decreased with an increase in soil depth, but significantly increased with an increase in aggregate size. C concentrations of light fraction in all aggregate classes were significantly higher under NT and forest than under CT. C concentrations in heavy fraction averaged 20, 10, and 8 g kg−1 under forest, NT, and CT, respectively. Of the total SOC pool, heavy fraction C accounted for 76% in CT soils and 63% in forest and NT soils. These data suggest that there is a greater protection of SOC by aggregates in the light fraction of minimally disturbed soils than that of disturbed soil, and the SOC loss following conversion from forest to agriculture is attributed to reduction in C concentrations in both heavy and light fractions. In contrast, the SOC gain upon conversion from CT to NT is primarily attributed to an increase in C concentration in the light fraction.
","language":"English","publisher":"Elsevier","doi":"10.1016/j.still.2006.01.003","usgsCitation":"Tan, Z., Lal, R., Owens, L., and Izaurralde, R.C., 2007, Distribution of light and heavy fractions of soil organic carbon as related to land use and tillage practice: Soil and Tillage Research, v. 92, no. 1-2, p. 53-59, https://doi.org/10.1016/j.still.2006.01.003.","productDescription":"7 p.","startPage":"53","endPage":"59","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":222,"text":"Earth Resources Observation and Science (EROS) Center","active":true,"usgs":true}],"links":[{"id":311702,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"92","issue":"1-2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5655983ae4b071e7ea53defe","contributors":{"authors":[{"text":"Tan, Zhengxi 0000-0002-4136-0921 ztan@usgs.gov","orcid":"https://orcid.org/0000-0002-4136-0921","contributorId":2945,"corporation":false,"usgs":true,"family":"Tan","given":"Zhengxi","email":"ztan@usgs.gov","affiliations":[{"id":223,"text":"Earth Resources Observation and Science (EROS) Center (Geography)","active":false,"usgs":true}],"preferred":true,"id":578232,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Lal, R.","contributorId":18559,"corporation":false,"usgs":true,"family":"Lal","given":"R.","email":"","affiliations":[],"preferred":false,"id":578233,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Owens, L.","contributorId":104731,"corporation":false,"usgs":true,"family":"Owens","given":"L.","email":"","affiliations":[],"preferred":false,"id":578234,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Izaurralde, R. C.","contributorId":149248,"corporation":false,"usgs":false,"family":"Izaurralde","given":"R.","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":578235,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70186201,"text":"70186201 - 2007 - Seabirds as indicators of marine ecosystems: Introduction: A modern role for seabirds as indicators","interactions":[],"lastModifiedDate":"2017-03-31T13:14:18","indexId":"70186201","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2663,"text":"Marine Ecology Progress Series","active":true,"publicationSubtype":{"id":10}},"title":"Seabirds as indicators of marine ecosystems: Introduction: A modern role for seabirds as indicators","docAbstract":"A key requirement for implementing ecosystem-based management is to obtain timely information on significant fluctuations in the ecosystem (Botsford et al. 1997). However, obtaining all necessary information about physical and biological changes at appropriate temporal and spatial scales is a daunting task. Intuitively, one might assume that physical data are more important for the interpretation of ecosystem changes than biological data, but analyses of time series data suggest otherwise: physical data are more erratic and often confusing over the short term compared to biological data, which tend to fluctuate less on annual time scales (Hare & Mantua 2000). Even so, biological time-series may also be confusing when coexisting marine species respond differently to ecosystem variability. For example, while warming temperatures in the Gulf of Alaska following the 1976 to 1977 regime shift favored an increase in gadoids and flatfish, a variety of forage fish and pandalid shrimp species virtually disappeared (Anderson & Piatt 1999). Zooplankton communities in the Gulf of Alaska also demonstrated similar patterns of response (Francis et al. 1998). At the basin scale, favorable conditions for salmon in Alaska following the regime shift were matched inversely by poor conditions in the California Current (Francis et al. 1998). In marine birds, subtropical species increased, while subarctic ones decreased during a warming phase in the southern California Bight. Clearly, no single index can tell the whole story accurately. Multi-species, multi-region, and multi-trophic level approaches are needed to quantify fluctuations in marine ecosystem processes and in the distribution and abundance of its inhabitants, to determine critical parameter thresholds and to use this information in management and marine conservation.
","language":"English","publisher":"Inter-Research","doi":"10.3354/meps07070","usgsCitation":"Piatt, J.F., Sydeman, W., and Wiese, F., 2007, Seabirds as indicators of marine ecosystems: Introduction: A modern role for seabirds as indicators: Marine Ecology Progress Series, v. 352, p. 199-204, https://doi.org/10.3354/meps07070.","productDescription":"6 p.","startPage":"199","endPage":"204","costCenters":[{"id":114,"text":"Alaska Science Center","active":true,"usgs":true}],"links":[{"id":476940,"rank":0,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.3354/meps07070","text":"Publisher Index Page"},{"id":338964,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"352","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"58df6ac8e4b02ff32c6aea79","contributors":{"authors":[{"text":"Piatt, John F. 0000-0002-4417-5748 jpiatt@usgs.gov","orcid":"https://orcid.org/0000-0002-4417-5748","contributorId":3025,"corporation":false,"usgs":true,"family":"Piatt","given":"John","email":"jpiatt@usgs.gov","middleInitial":"F.","affiliations":[{"id":114,"text":"Alaska Science Center","active":true,"usgs":true},{"id":117,"text":"Alaska Science Center Biology WTEB","active":true,"usgs":true},{"id":116,"text":"Alaska Science Center Biology MFEB","active":true,"usgs":true}],"preferred":true,"id":687861,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Sydeman, William J.","contributorId":172574,"corporation":false,"usgs":false,"family":"Sydeman","given":"William J.","affiliations":[],"preferred":false,"id":687862,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Wiese, Francis","contributorId":172575,"corporation":false,"usgs":false,"family":"Wiese","given":"Francis","email":"","affiliations":[],"preferred":false,"id":687863,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70192571,"text":"70192571 - 2007 - Characterization of nutrient, organic carbon, and sediment loads and concentrations from the Mississippi River into the northern Gulf of Mexico","interactions":[],"lastModifiedDate":"2017-10-26T14:58:44","indexId":"70192571","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1584,"text":"Estuaries and Coasts","active":true,"publicationSubtype":{"id":10}},"title":"Characterization of nutrient, organic carbon, and sediment loads and concentrations from the Mississippi River into the northern Gulf of Mexico","docAbstract":"We synthesize and update the science supporting the Action Plan for Reducing, Mitigating, and Controlling Hypoxia in the Northern Gulf of Mexico (Mississippi River/Gulf of Mexico Watershed Nutrient Task Force 2001) with a focus on the spatial and temporal discharge and patterns of nutrient and organic carbon delivery to the northern Gulf of Mexico, including data through 2006. The discharge of the Mississippi River watershed over 200 years varies but is not demonstrably increasing or decreasing. About 30% of the Mississippi River was shunted westward to form the Atchafalaya River, which redistributed water and nutrient loads on the shelf. Data on nitrogen concentrations from the early 1900s demonstrate that the seasonal and annual concentrations in the lower river have increased considerably since then, including a higher spring loading, following the increase in fertilizer applications after World WarII. The loading of total nitrogen (TN) fell from 1990 to 2006, but the loading of total phosphorus (TP) has risen slightly, resulting in a decline in the TN:TP ratios. The present TN:TP ratios hover around an average indicative of potential nitrogen limitation on phytoplankton growth, or balanced growth limitation, but not phosphorus limitation. The dissolved nitrogen:dissolved silicate ratios are near the Redfield ratio indicative of growth limitations on diatoms. Although nutrient concentrations are relatively high compared to those in many other large rivers, the water quality in the Mississippi River is not unique in that nutrient loads can be described by a variety of land-use models. There is no net removal of nitrogen from water flowing through the Atchafalaya basin, but the concentrations of TP and suspended sediments are lower at the exit point (Morgan City, Louisiana) than in the water entering the Atchafalaya basin. The removal of nutrients entering offshore waters through diversion of river water into wetlands is presently less than 1% of the total loadings going directly offshore, and would be less than 8% if the 10,093 km2 of coastal wetlands were successfully engineered for that purpose. Wetland loss is an insignificant contribution to the carbon loading offshore, compared to in situ marine production. The science-based conclusions in the Action Plan about nutrient loads and sources to the hypoxic zone off Louisiana are sustained by research and monitoring occurring in the subsequent 10 years.
","language":"English","publisher":"Springer","doi":"10.1007/BF02841333","usgsCitation":"Turner, R., Rabalais, N.N., Alexander, R.B., McIsaac, G., and Howarth, R.W., 2007, Characterization of nutrient, organic carbon, and sediment loads and concentrations from the Mississippi River into the northern Gulf of Mexico: Estuaries and Coasts, v. 30, no. 5, p. 773-790, https://doi.org/10.1007/BF02841333.","productDescription":"18 p.","startPage":"773","endPage":"790","ipdsId":"IP-003277","costCenters":[{"id":451,"text":"National Water Quality Assessment Program","active":true,"usgs":true}],"links":[{"id":347502,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","otherGeospatial":"Gulf of Mexico, Mississippi River","volume":"30","issue":"5","publishingServiceCenter":{"id":9,"text":"Reston PSC"},"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5a07fcf2e4b09af898c8ce3a","contributors":{"authors":[{"text":"Turner, R.E.","contributorId":39749,"corporation":false,"usgs":false,"family":"Turner","given":"R.E.","email":"","affiliations":[{"id":16756,"text":"Louisiana State University, Baton Rouge, LA","active":true,"usgs":false}],"preferred":false,"id":716458,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Rabalais, N. N.","contributorId":198497,"corporation":false,"usgs":false,"family":"Rabalais","given":"N.","email":"","middleInitial":"N.","affiliations":[{"id":12699,"text":"Louisiana Universities Marine Consortium","active":true,"usgs":false}],"preferred":false,"id":716459,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Alexander, Richard B. 0000-0001-9166-0626 ralex@usgs.gov","orcid":"https://orcid.org/0000-0001-9166-0626","contributorId":541,"corporation":false,"usgs":true,"family":"Alexander","given":"Richard","email":"ralex@usgs.gov","middleInitial":"B.","affiliations":[{"id":503,"text":"Office of Water Quality","active":true,"usgs":true},{"id":451,"text":"National Water Quality Assessment Program","active":true,"usgs":true}],"preferred":true,"id":716460,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"McIsaac, G.","contributorId":198496,"corporation":false,"usgs":false,"family":"McIsaac","given":"G.","email":"","affiliations":[{"id":16984,"text":"University of Illinois at Urbana-Champaign","active":true,"usgs":false}],"preferred":false,"id":716461,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Howarth, R. W.","contributorId":48126,"corporation":false,"usgs":false,"family":"Howarth","given":"R.","email":"","middleInitial":"W.","affiliations":[{"id":12722,"text":"Cornell University","active":true,"usgs":false}],"preferred":false,"id":716462,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70194183,"text":"70194183 - 2007 - Seasonal and interannual variability in the taxonomic composition and production dynamics of phytoplankton assemblages in Crater Lake, Oregon","interactions":[],"lastModifiedDate":"2017-11-22T18:06:53","indexId":"70194183","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1919,"text":"Hydrobiologia","onlineIssn":"1573-5117","printIssn":"0018-8158","active":true,"publicationSubtype":{"id":10}},"title":"Seasonal and interannual variability in the taxonomic composition and production dynamics of phytoplankton assemblages in Crater Lake, Oregon","docAbstract":"Taxonomic composition and production dynamics of phytoplankton assemblages in Crater Lake, Oregon, were examined during time periods between 1984 and 2000. The objectives of the study were (1) to investigate spatial and temporal patterns in species composition, chlorophyll concentration, and primary productivity relative to seasonal patterns of water circulation; (2) to explore relationships between water column chemistry and the taxonomic composition of the phytoplankton; and (3) to determine effects of primary and secondary consumers on the phytoplankton assemblage. An analysis of 690 samples obtained on 50 sampling dates from 14 depths in the water column found a total of 163 phytoplankton taxa, 134 of which were identified to genus and 101 were identified to the species or variety level of classification. Dominant species by density or biovolume included Nitzschia gracilis, Stephanodiscus hantzschii, Ankistrodesmus spiralis, Mougeotia parvula, Dinobryon sertularia, Tribonema affine, Aphanocapsa delicatissima, Synechocystis sp., Gymnodinium inversum, and Peridinium inconspicuum. When the lake was thermally stratified in late summer, some of these species exhibited a stratified vertical distribution in the water column. A cluster analysis of these data also revealed a vertical stratification of the flora from the middle of the summer through the early fall. Multivariate test statistics indicated that there was a significant relationship between the species composition of the phytoplankton and a corresponding set of chemical variables measured for samples from the water column. In this case, concentrations of total phosphorus, ammonia, total Kjeldahl nitrogen, and alkalinity were associated with interannual changes in the flora; whereas pH and concentrations of dissolved oxygen, orthophosphate, nitrate, and silicon were more closely related to spatial variation and thermal stratification. The maximum chlorophyll concentration when the lake was thermally stratified in August and September was usually between depths of 100 m and 120 m. In comparison, the depth of maximum primary production ranged from 60 m to 80 m at this time of year. Regression analysis detected a weak negative relationship between chlorophyll concentration and Secchi disk depth, a measure of lake transparency. However, interannual changes in chlorophyll concentration and the species composition of the phytoplankton could not be explained by the removal of the septic field near Rim Village or by patterns of upwelling from the deep lake. An alternative trophic hypothesis proposes that the productivity of Crater Lake is controlled primarily by long-term patterns of climatic change that regulate the supply of allochthonous nutrients.
","language":"English","publisher":"Springer","doi":"10.1007/s10750-006-0352-4","usgsCitation":"C. David, M., Larson, G.L., and Truitt, R.E., 2007, Seasonal and interannual variability in the taxonomic composition and production dynamics of phytoplankton assemblages in Crater Lake, Oregon: Hydrobiologia, v. 574, no. 1, p. 179-204, https://doi.org/10.1007/s10750-006-0352-4.","productDescription":"26 p.","startPage":"179","endPage":"204","costCenters":[{"id":290,"text":"Forest and Rangeland Ecosystem Science Center","active":false,"usgs":true}],"links":[{"id":349023,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Crater Lake","otherGeospatial":"Oregon","volume":"574","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5a6111a7e4b06e28e9c2582d","contributors":{"authors":[{"text":"C. David, McIntire","contributorId":93669,"corporation":false,"usgs":false,"family":"C. David","given":"McIntire","email":"","affiliations":[],"preferred":false,"id":722563,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Larson, Gary L. gary_l._larson@usgs.gov","contributorId":2990,"corporation":false,"usgs":true,"family":"Larson","given":"Gary","email":"gary_l._larson@usgs.gov","middleInitial":"L.","affiliations":[],"preferred":true,"id":722564,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Truitt, Robert E.","contributorId":168619,"corporation":false,"usgs":false,"family":"Truitt","given":"Robert","email":"","middleInitial":"E.","affiliations":[],"preferred":false,"id":722565,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70009844,"text":"70009844 - 2007 - A rapid method to characterize seabed habitats and associated macro-organisms","interactions":[],"lastModifiedDate":"2012-03-12T17:18:20","indexId":"70009844","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3458,"text":"Special Paper - Geological Association of Canada","active":true,"publicationSubtype":{"id":10}},"title":"A rapid method to characterize seabed habitats and associated macro-organisms","docAbstract":"This study presents a method for rapidly collecting, processing, and interrogating real-time abiotic and biotic seabed data to determine seabed habitat classifications. This is done from data collected over a large area of an acoustically derived seabed map, along multidirectional transects, using a towed small camera-sled. The seabed, within the newly designated Point Harris Marine Reserve on the northern coast of San Miguel Island, California, was acoustically imaged using sidescan sonar then ground-truthed using a towed small camera-sled. Seabed characterizations were made from video observations, and were logged to a laptop computer (PC) in real time. To ground-truth the acoustic mosaic, and to characterize abiotic and biotic aspects of the seabed, a three-tiered characterization scheme was employed that described the substratum type, physical structure (i.e., bedform or vertical relief), and the occurrence of benthic macrofauna and flora. A crucial advantage of the method described here, is that preliminary seabed characterizations can be interrogated and mapped over the sidescan mosaic and other seabed information within hours of data collection. This ability to rapidly process seabed data is invaluable to scientists and managers, particularly in modifying concurrent or planning subsequent surveys.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Special Paper - Geological Association of Canada","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","issn":"00721042","isbn":"9781897095331","usgsCitation":"Anderson, T., Cochrane, G., Roberts, D., Chezar, H., and Hatcher, G., 2007, A rapid method to characterize seabed habitats and associated macro-organisms: Special Paper - Geological Association of Canada, no. 47, p. 71-79.","startPage":"71","endPage":"79","numberOfPages":"9","costCenters":[],"links":[{"id":218829,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"issue":"47","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059e52de4b0c8380cd46bb0","contributors":{"editors":[{"text":"Todd B.J.Greene H.G.","contributorId":128294,"corporation":true,"usgs":false,"organization":"Todd B.J.Greene H.G.","id":536240,"contributorType":{"id":2,"text":"Editors"},"rank":1}],"authors":[{"text":"Anderson, T.J.","contributorId":63157,"corporation":false,"usgs":true,"family":"Anderson","given":"T.J.","email":"","affiliations":[],"preferred":false,"id":357270,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Cochrane, G.R.","contributorId":104002,"corporation":false,"usgs":true,"family":"Cochrane","given":"G.R.","email":"","affiliations":[],"preferred":false,"id":357272,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Roberts, D.A.","contributorId":74505,"corporation":false,"usgs":true,"family":"Roberts","given":"D.A.","email":"","affiliations":[],"preferred":false,"id":357271,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Chezar, H.","contributorId":52321,"corporation":false,"usgs":true,"family":"Chezar","given":"H.","email":"","affiliations":[],"preferred":false,"id":357269,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Hatcher, G.","contributorId":29127,"corporation":false,"usgs":true,"family":"Hatcher","given":"G.","email":"","affiliations":[],"preferred":false,"id":357268,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70195443,"text":"70195443 - 2007 - Thermal maturation history of the Wilcox group (Paleocene-Eocene), Texas: Results of regional-scale multi-1D modeling","interactions":[],"lastModifiedDate":"2018-02-15T15:09:37","indexId":"70195443","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"seriesNumber":"27","title":"Thermal maturation history of the Wilcox group (Paleocene-Eocene), Texas: Results of regional-scale multi-1D modeling","docAbstract":"The thermal maturation history of the Paleocene-Eocene Wilcox Group has been reconstructed based on burial history models of 53 wells in the Texas coastal plain. This modeling study has been conducted in conjunction with a geologically based assessment of the oil and gas resources in Cenozoic strata of the Gulf of Mexico coastal plain and state waters. In the onshore Texas coastal plain, coals and organic-rich shales, predominantly of terrestrial origin, within the Wilcox Group are the primary source of oil (Wenger et al., 1994) as well as a source of gas. The Wilcox, however, is modeled as a single unit, without subdivision into source rock and non-source rock intervals.
Generation of oil from Type III kerogen within the Wilcox Group is modeled using hydrous pyrolysis reaction kinetic parameters (Lewan, M.D., written communication, 2006). Gas generation from Type III kerogen is represented using calculated Ro values. The models are calibrated with bottom hole temperature (BHT), and vitrinite reflectance (Ro %) data for the Wilcox Group. Ro data from near-coastal sites have been selected to minimize the possible effects of uplift and erosion and then composited to give a regional Rodepth trend.
Model calculations for the study area, the onshore Texas coastal plain, indicate that downdip portions of the basal Wilcox had reached sufficient thermal maturity to generate hydrocarbons by early Eocene (~50 Ma). This relatively early maturation is explained by rapid sediment accumulation in the early Tertiary combined with the reaction kinetic parameters used in the models. Thermal maturation increases through time with increasing burial depth and temperature, gradually moving the maturation front updip. At present day, hydrocarbon generation is complete in the downdip Wilcox within the study area but is currently ongoing in the updip portions of the formation.
","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"The Paleogene of the Gulf of Mexico and Caribbean basins: Processes, events, and petroleum systems","largerWorkSubtype":{"id":12,"text":"Conference publication"},"conferenceTitle":"27th Annual Gulf Coast Section SEPM Foundation Bob F. Perkins Research Conference","conferenceDate":"December 2-5, 2007","conferenceLocation":"Houston, TX","language":"English","publisher":"SEPM Society for Sedimentary Geology","doi":"10.5724/gcs.07.27.0714","isbn":"978-0-9836096-3-6","usgsCitation":"Rowan, E., Warwick, P.D., and Pitman, J.K., 2007, Thermal maturation history of the Wilcox group (Paleocene-Eocene), Texas: Results of regional-scale multi-1D modeling, in The Paleogene of the Gulf of Mexico and Caribbean basins: Processes, events, and petroleum systems, Houston, TX, December 2-5, 2007, p. 714-743, https://doi.org/10.5724/gcs.07.27.0714.","productDescription":"30 p.","startPage":"714","endPage":"743","costCenters":[],"links":[{"id":351667,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":351666,"rank":1,"type":{"id":15,"text":"Index Page"},"url":"https://www.gcssepm.org/conference/2007_conference.htm"}],"country":"United States","state":"Texas","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5afeff77e4b0da30c1bfcb88","contributors":{"editors":[{"text":"Kennan, Lorcan","contributorId":102036,"corporation":false,"usgs":false,"family":"Kennan","given":"Lorcan","email":"","affiliations":[],"preferred":false,"id":728633,"contributorType":{"id":2,"text":"Editors"},"rank":1},{"text":"Pindell, James","contributorId":86137,"corporation":false,"usgs":false,"family":"Pindell","given":"James","email":"","affiliations":[],"preferred":false,"id":728634,"contributorType":{"id":2,"text":"Editors"},"rank":2},{"text":"Rosen, Norman C.","contributorId":40565,"corporation":false,"usgs":false,"family":"Rosen","given":"Norman","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":728635,"contributorType":{"id":2,"text":"Editors"},"rank":3}],"authors":[{"text":"Rowan, E. L. 0000-0001-5753-6189","orcid":"https://orcid.org/0000-0001-5753-6189","contributorId":34921,"corporation":false,"usgs":true,"family":"Rowan","given":"E. L.","affiliations":[],"preferred":false,"id":728636,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Warwick, Peter D. 0000-0002-3152-7783 pwarwick@usgs.gov","orcid":"https://orcid.org/0000-0002-3152-7783","contributorId":762,"corporation":false,"usgs":true,"family":"Warwick","given":"Peter","email":"pwarwick@usgs.gov","middleInitial":"D.","affiliations":[{"id":241,"text":"Eastern Energy Resources Science Center","active":true,"usgs":true}],"preferred":false,"id":728637,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Pitman, Janet K. 0000-0002-0441-779X jpitman@usgs.gov","orcid":"https://orcid.org/0000-0002-0441-779X","contributorId":767,"corporation":false,"usgs":true,"family":"Pitman","given":"Janet","email":"jpitman@usgs.gov","middleInitial":"K.","affiliations":[{"id":164,"text":"Central Energy Resources Science Center","active":true,"usgs":true},{"id":241,"text":"Eastern Energy Resources Science Center","active":true,"usgs":true}],"preferred":true,"id":728638,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70031076,"text":"70031076 - 2007 - Using pebble lithology and roundness to interpret gravel provenance in piedmont fluvial systems of the Rocky Mountains, USA","interactions":[],"lastModifiedDate":"2012-03-12T17:21:16","indexId":"70031076","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3368,"text":"Sedimentary Geology","active":true,"publicationSubtype":{"id":10}},"title":"Using pebble lithology and roundness to interpret gravel provenance in piedmont fluvial systems of the Rocky Mountains, USA","docAbstract":"Clast populations in piedmont fluvial systems are products of complex histories that complicate provenance interpretation. Although pebble counts of lithology are widely used, the information provided by a pebble count has been filtered by a potentially large number of processes and circumstances. Counts of pebble lithology and roundness together offer more power than lithology alone for the interpretation of provenance. In this study we analyze pebble counts of lithology and roundness in two contrasting fluvial systems of Pleistocene age to see how provenance varies with drainage size. The two systems are 1) a group of small high-gradient incised streams that formed alluvial fans and terraces and 2) a piedmont river that formed terraces in response to climate-driven cycles of aggradation and incision. We first analyze the data from these systems within their geographic and geologic context. After this is done, we employ contingency table analysis to complete the interpretation of pebble provenance. Small tributary streams that drain rugged mountains on both sides of the Santa Cruz River, southeast Arizona, deposited gravel in fan and terrace deposits of Pleistocene age. Volcanic, plutonic and, to a lesser extent, sedimentary rocks are the predominant pebble lithologies. Large contrasts in gravel lithology are evident among adjacent fans. Subangular to subrounded pebbles predominate. Contingency table analysis shows that hard volcanic rocks tend to remain angular and, even though transport distances have been short, soft tuff and sedimentary rocks tend to become rounded. The Wind River, a major piedmont stream in Wyoming, drains rugged mountains surrounding the northwest part of the Wind River basin. Under the influence of climate change and glaciation during the Pleistocene, the river deposited an extensive series of terrace gravels. In contrast to Santa Cruz tributary gravel, most of the Wind River gravel is relatively homogenous in lithology and is rounded to well-rounded. Detailed analysis reveals a multitude of sources in the headwaters and the basin itself, but lithologies from these sources are combined downstream. Well-rounded volcanic and recycled quartzite clasts were derived from the headwaters. Precambrian igneous and metamorphic clasts were brought down tributary valleys to the Wind River by glaciers, and sandstone was added where the river enters the Wind River structural basin.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Sedimentary Geology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1016/j.sedgeo.2007.02.006","issn":"00370738","usgsCitation":"Lindsey, D.A., Langer, W.H., and Van Gosen, B.S., 2007, Using pebble lithology and roundness to interpret gravel provenance in piedmont fluvial systems of the Rocky Mountains, USA: Sedimentary Geology, v. 199, no. 3-4, p. 223-232, https://doi.org/10.1016/j.sedgeo.2007.02.006.","startPage":"223","endPage":"232","numberOfPages":"10","costCenters":[],"links":[{"id":238908,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":211594,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.sedgeo.2007.02.006"}],"volume":"199","issue":"3-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505bc08ee4b08c986b32a1c3","contributors":{"authors":[{"text":"Lindsey, D. A.","contributorId":49814,"corporation":false,"usgs":true,"family":"Lindsey","given":"D.","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":429927,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Langer, W. H.","contributorId":44932,"corporation":false,"usgs":true,"family":"Langer","given":"W.","email":"","middleInitial":"H.","affiliations":[],"preferred":false,"id":429926,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Van Gosen, B. S. 0000-0003-4214-3811","orcid":"https://orcid.org/0000-0003-4214-3811","contributorId":97907,"corporation":false,"usgs":true,"family":"Van Gosen","given":"B.","middleInitial":"S.","affiliations":[],"preferred":false,"id":429928,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70174202,"text":"70174202 - 2007 - Weirs: Counting and sampling adult salmonids in streams and rivers","interactions":[],"lastModifiedDate":"2016-06-29T12:43:14","indexId":"70174202","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":5,"text":"Book chapter"},"publicationSubtype":{"id":24,"text":"Book Chapter"},"title":"Weirs: Counting and sampling adult salmonids in streams and rivers","docAbstract":"Weirs—which function as porous barriers built across stream—have long been used to capture migrating fish in flowing waters. For example, the Netsilik peoples of northern Canada used V-shaped weirs constructed of river rocks gathered onsite to capture migrating Arctic char Salvelinus alpinus (Balikci 1970). Similarly, fences constructed of stakes and a latticework of willow branches or staves were used by Native Americans to capture migrating salmon in streams along the West Coast of North America (Stewart 1994). In modern times, weirs have also been used in terminal fisheries and to capture brood fish for use in fish culture. Weirs have been used to gather data on age structure, condition, sex ratio, spawning escapement, abundance, and migratory patterns of fish in streams. One of the critical elements of fisheries management and stock assessment of salmonids is a count of adult fish returning to spawn. Weirs are frequently used to capture or count fish to determine status and trends of populations or direct inseason management of fisheries; generally, weirs are the standard against which other techniques are measured. To evaluate fishery management actions, the number of fish escaping to spawn is often compared to river-specific target spawning requirements (O’Connell and Dempson 1995). A critical factor in these analyses is the determination of total run size (O’Connell 2003). O’Connell compared methods of run-size estimation against absolute counts from a rigid weir and concluded that, given the uncertainty of estimators, the absolute counts obtained at the weir wer significantly better than modeled estimates, which deviated as much as 50–60% from actual counts. The use of weirs is generally restricted to streams and small rivers because of construction expense, formation of navigation barriers, and the tendency of weirs to clog with debris, which can cause flooding and collapse of the structure (Hubert 1996). When feasible, however, weirs are generally regarded as the most accurate technique available to quantify escapement as the result is supposedly an absolute count (Cousens et al. 1982). Weirs also provide the opportunity to capture fish for observation and sampling of biological characteristics and tissues; they may also serve as recapture sites for basin-wide, mark–recapture population estimates. Temporary weirs are useful in monitoring wild populations of salmonids as well as for capturing broodstock for artificial propagation.
","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"Salmonid field protocols handbook: techniques for assessing status and trends in salmon and trout populations.","largerWorkSubtype":{"id":14,"text":"Instruction"},"language":"English","publisher":"American Fisheries Society","isbn":"978-1-888569-92-6","usgsCitation":"Zimmerman, C.E., and Zabkar, L.M., 2007, Weirs: Counting and sampling adult salmonids in streams and rivers, chap. of Salmonid field protocols handbook: techniques for assessing status and trends in salmon and trout populations., p. 385-398.","productDescription":"14 p.","startPage":"385","endPage":"398","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":114,"text":"Alaska Science Center","active":true,"usgs":true}],"links":[{"id":324617,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5774f315e4b07dd077c6aef5","contributors":{"compilers":[{"text":"Johnson, David H.","contributorId":172563,"corporation":false,"usgs":false,"family":"Johnson","given":"David","email":"","middleInitial":"H.","affiliations":[],"preferred":false,"id":641267,"contributorType":{"id":3,"text":"Compilers"},"rank":1},{"text":"Shrier, Brianna M.","contributorId":172557,"corporation":false,"usgs":false,"family":"Shrier","given":"Brianna","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":641268,"contributorType":{"id":3,"text":"Compilers"},"rank":2},{"text":"O’Neal, Jennifer S.","contributorId":147875,"corporation":false,"usgs":false,"family":"O’Neal","given":"Jennifer","email":"","middleInitial":"S.","affiliations":[],"preferred":false,"id":641269,"contributorType":{"id":3,"text":"Compilers"},"rank":3},{"text":"Knutzen, John A.","contributorId":172558,"corporation":false,"usgs":false,"family":"Knutzen","given":"John","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":641270,"contributorType":{"id":3,"text":"Compilers"},"rank":4},{"text":"Augerot, Xanthippe","contributorId":172559,"corporation":false,"usgs":false,"family":"Augerot","given":"Xanthippe","email":"","affiliations":[],"preferred":false,"id":641271,"contributorType":{"id":3,"text":"Compilers"},"rank":5},{"text":"O’Neal, Thomas A.","contributorId":172560,"corporation":false,"usgs":false,"family":"O’Neal","given":"Thomas","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":641272,"contributorType":{"id":3,"text":"Compilers"},"rank":6},{"text":"Pearsons, Todd N.","contributorId":95345,"corporation":false,"usgs":true,"family":"Pearsons","given":"Todd N.","affiliations":[],"preferred":false,"id":641273,"contributorType":{"id":3,"text":"Compilers"},"rank":7}],"authors":[{"text":"Zimmerman, Christian E. 0000-0002-3646-0688 czimmerman@usgs.gov","orcid":"https://orcid.org/0000-0002-3646-0688","contributorId":410,"corporation":false,"usgs":true,"family":"Zimmerman","given":"Christian","email":"czimmerman@usgs.gov","middleInitial":"E.","affiliations":[{"id":116,"text":"Alaska Science Center Biology MFEB","active":true,"usgs":true},{"id":114,"text":"Alaska Science Center","active":true,"usgs":true},{"id":120,"text":"Alaska Science Center Water","active":true,"usgs":true}],"preferred":true,"id":641265,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Zabkar, Laura M.","contributorId":172562,"corporation":false,"usgs":false,"family":"Zabkar","given":"Laura","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":641266,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70030116,"text":"70030116 - 2007 - A model for estimating passive integrated transponder (PIT) tag antenna efficiencies for interval-specific emigration rates","interactions":[],"lastModifiedDate":"2012-03-12T17:21:09","indexId":"70030116","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3624,"text":"Transactions of the American Fisheries Society","active":true,"publicationSubtype":{"id":10}},"title":"A model for estimating passive integrated transponder (PIT) tag antenna efficiencies for interval-specific emigration rates","docAbstract":"Our goal was to understand movement and its interaction with survival for populations of stream salmonids at long-term study sites in the northeastern United States by employing passive integrated transponder (PIT) tags and associated technology. Although our PIT tag antenna arrays spanned the stream channel (at most flows) and were continuously operated, we are aware that aspects of fish behavior, environmental characteristics, and electronic limitations influenced our ability to detect 100% of the emigration from our stream site. Therefore, we required antenna efficiency estimates to adjust observed emigration rates. We obtained such estimates by testing a full-scale physical model of our PIT tag antenna array in a laboratory setting. From the physical model, we developed a statistical model that we used to predict efficiency in the field. The factors most important for predicting efficiency were external radio frequency signal and tag type. For most sampling intervals, there was concordance between the predicted and observed efficiencies, which allowed us to estimate the true emigration rate for our field populations of tagged salmonids. One caveat is that the model's utility may depend on its ability to characterize external radio frequency signals accurately. Another important consideration is the trade-off between the volume of data necessary to model efficiency accurately and the difficulty of storing and manipulating large amounts of data.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Transactions of the American Fisheries Society","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1577/T06-053.1","issn":"00028487","usgsCitation":"Horton, G., Dubreuil, T., and Letcher, B., 2007, A model for estimating passive integrated transponder (PIT) tag antenna efficiencies for interval-specific emigration rates: Transactions of the American Fisheries Society, v. 136, no. 5, p. 1165-1176, https://doi.org/10.1577/T06-053.1.","startPage":"1165","endPage":"1176","numberOfPages":"12","costCenters":[],"links":[{"id":212938,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1577/T06-053.1"},{"id":240506,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"136","issue":"5","noUsgsAuthors":false,"publicationDate":"2011-01-09","publicationStatus":"PW","scienceBaseUri":"5059e469e4b0c8380cd46643","contributors":{"authors":[{"text":"Horton, G.E.","contributorId":8594,"corporation":false,"usgs":true,"family":"Horton","given":"G.E.","email":"","affiliations":[],"preferred":false,"id":425770,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Dubreuil, T.L.","contributorId":106697,"corporation":false,"usgs":true,"family":"Dubreuil","given":"T.L.","email":"","affiliations":[],"preferred":false,"id":425772,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Letcher, B. H. 0000-0003-0191-5678","orcid":"https://orcid.org/0000-0003-0191-5678","contributorId":48132,"corporation":false,"usgs":true,"family":"Letcher","given":"B.","middleInitial":"H.","affiliations":[{"id":365,"text":"Leetown Science Center","active":true,"usgs":true}],"preferred":false,"id":425771,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70033643,"text":"70033643 - 2007 - Characterization of microtopography and its influence on vegetation patterns in created wetlands","interactions":[],"lastModifiedDate":"2020-09-10T19:16:52.949649","indexId":"70033643","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3750,"text":"Wetlands","onlineIssn":"1943-6246","printIssn":"0277-5212","active":true,"publicationSubtype":{"id":10}},"title":"Characterization of microtopography and its influence on vegetation patterns in created wetlands","docAbstract":"Created wetlands are increasingly used to mitigate wetland loss. Thus, identifying wetland creation methods that enhance ecosystem development might increase the likelihood of mitigation success. Noting that the microtopographic variation found in natural wetland settings may not commonly be found in created wetlands, this study explores relationships between induced microtopography, hydrology, and plant species richness/diversity in non-tidal freshwater wetlands, comparing results from two created wetland complexes with those from a mature reference wetland complex in northern Virginia. Elevation, steel rod oxidation depth, and species cover were measured along replicate multiscale (0.5 m-, 1 m-, 2 m-, and 4 m-diameter) tangentially conjoined circular transects in each wetland. Microtopography was surveyed using a total station and results used to derive three roughness indices: tortuosity, limiting slope, and limiting elevation difference. Steel rod oxidation depth was used to estimate water table depth, with data collected four times during the growing season for each study site. Plant species cover was estimated visually in 0.2 m2 plots surveyed at peak growth and used to assess species richness, diversity, and wetland prevalence index. Differences in each attribute were examined among disked and non-disked created wetlands and compared to a natural wetland as a reference. Disked and non-disked created wetlands differed in microtopography, both in terms of limiting elevation difference and tortuosity. However, both were within the range of microtopography encompassed by natural wetlands. Disked wetlands supported higher plant diversity and species richness than either natural or non-disked wetlands, as well as greater within-site species assemblage variability than non-disked wetlands. Irrespective of creation method, plant diversity in created wetlands was correlated with tortuosity and limiting elevation difference, similar to correlations observed for natural wetlands. Vegetation was more hydrophytic at disked sites than at non-disked sites, and of equivalent wetland indicator status to natural sites, even though all sites appeared comparable in terms of hydrology. Results suggest that disking may enhance vegetation community development, thus better supporting the goals of wetland mitigation.
","language":"English","publisher":"Springer","doi":"10.1672/0277-5212(2007)27[1081:COMAII]2.0.CO;2","usgsCitation":"Moser, K., Ahn, C., and Noe, G.E., 2007, Characterization of microtopography and its influence on vegetation patterns in created wetlands: Wetlands, v. 27, no. 4, p. 1081-1097, https://doi.org/10.1672/0277-5212(2007)27[1081:COMAII]2.0.CO;2.","productDescription":"17 p.","startPage":"1081","endPage":"1097","numberOfPages":"17","costCenters":[{"id":40020,"text":"Florence Bascom Geoscience Center","active":true,"usgs":true}],"links":[{"id":242159,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Virginia","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -77.62321472167969,\n 38.656560576727024\n ],\n [\n -76.9097900390625,\n 38.656560576727024\n ],\n [\n -76.9097900390625,\n 39.05651736286005\n ],\n [\n -77.62321472167969,\n 39.05651736286005\n ],\n [\n -77.62321472167969,\n 38.656560576727024\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"27","issue":"4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059f4d1e4b0c8380cd4bf42","contributors":{"authors":[{"text":"Moser, K.","contributorId":63607,"corporation":false,"usgs":true,"family":"Moser","given":"K.","email":"","affiliations":[],"preferred":false,"id":441811,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Ahn, C.","contributorId":22589,"corporation":false,"usgs":true,"family":"Ahn","given":"C.","email":"","affiliations":[],"preferred":false,"id":441810,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Noe, Gregory E. 0000-0002-6661-2646 gnoe@usgs.gov","orcid":"https://orcid.org/0000-0002-6661-2646","contributorId":139100,"corporation":false,"usgs":true,"family":"Noe","given":"Gregory","email":"gnoe@usgs.gov","middleInitial":"E.","affiliations":[{"id":37277,"text":"WMA - Earth System Processes Division","active":true,"usgs":true},{"id":436,"text":"National Research Program - Eastern Branch","active":true,"usgs":true},{"id":40020,"text":"Florence Bascom Geoscience Center","active":true,"usgs":true},{"id":36183,"text":"Hydro-Ecological Interactions Branch","active":true,"usgs":true}],"preferred":true,"id":441812,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70034543,"text":"70034543 - 2007 - Improved outgassing models for the Landsat-5 thematic mapper","interactions":[],"lastModifiedDate":"2022-05-18T15:07:28.918166","indexId":"70034543","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"Improved outgassing models for the Landsat-5 thematic mapper","docAbstract":"The Landsat-5 (L5) Thematic Mapper (TM) detectors of the short wave infrared (SWIR) bands 5 and 7 are maintained on cryogenic temperatures to minimize thermal noise and allow adequate detection of scene energy. Over the instrument's lifetime, gain oscillations are observed in these bands that are caused by an ice-like contaminant that gradually builds up on the window of a dewar that houses these bands' detectors. This process of icing, an effect of material outgassing in space, is detected and characterized through observations of Internal Calibrator (IC) data. Analyses of IC data indicated three to five percent uncertainty in absolute gain estimates due to this icing phenomenon. The thin-film interference lifetime models implemented in the image product generation systems at the U.S. Geological Survey (USGS) Center for Earth Resources Observation and Science (EROS) successfully remove up to 80 percent of the icing effects for the image acquisition period from the satellite's launch in 1984 until 2001; however, their correction ability was found to be much lower for the time thereafter. This study concentrates on improving the estimates of the contaminant film growth rate and the associated change in the period of gain oscillations. The goal is to provide model parameters with the potential to correct 70 to 80 percent of gain uncertainties caused by outgassing effects in L5 TM bands 5 and 7 over the instrument's entire lifetime.
","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"International Geoscience and Remote Sensing Symposium (IGARSS)","largerWorkSubtype":{"id":12,"text":"Conference publication"},"conferenceTitle":"2007 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2007","conferenceDate":"June 23-28, 2007","conferenceLocation":"Barcelona, Spain","language":"English","publisher":"IEEE","doi":"10.1109/IGARSS.2007.4423440","usgsCitation":"Micijevic, E., Chander, G., and Hayes, R.W., 2007, Improved outgassing models for the Landsat-5 thematic mapper, in International Geoscience and Remote Sensing Symposium (IGARSS), Barcelona, Spain, June 23-28, 2007, p. 2860-2863, https://doi.org/10.1109/IGARSS.2007.4423440.","productDescription":"4 p.","startPage":"2860","endPage":"2863","costCenters":[{"id":222,"text":"Earth Resources Observation and Science (EROS) Center","active":true,"usgs":true}],"links":[{"id":243598,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a3961e4b0c8380cd618d7","contributors":{"authors":[{"text":"Micijevic, E. 0000-0002-3828-9239","orcid":"https://orcid.org/0000-0002-3828-9239","contributorId":59939,"corporation":false,"usgs":true,"family":"Micijevic","given":"E.","affiliations":[],"preferred":false,"id":446312,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Chander, G.","contributorId":51449,"corporation":false,"usgs":true,"family":"Chander","given":"G.","affiliations":[],"preferred":false,"id":446311,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Hayes, R. W.","contributorId":105493,"corporation":false,"usgs":true,"family":"Hayes","given":"R.","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":446313,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70029702,"text":"70029702 - 2007 - Comparison of four approaches to a rock facies classification problem","interactions":[],"lastModifiedDate":"2012-03-12T17:21:06","indexId":"70029702","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1315,"text":"Computers & Geosciences","printIssn":"0098-3004","active":true,"publicationSubtype":{"id":10}},"title":"Comparison of four approaches to a rock facies classification problem","docAbstract":"In this study, seven classifiers based on four different approaches were tested in a rock facies classification problem: classical parametric methods using Bayes' rule, and non-parametric methods using fuzzy logic, k-nearest neighbor, and feed forward-back propagating artificial neural network. Determining the most effective classifier for geologic facies prediction in wells without cores in the Panoma gas field, in Southwest Kansas, was the objective. Study data include 3600 samples with known rock facies class (from core) with each sample having either four or five measured properties (wire-line log curves), and two derived geologic properties (geologic constraining variables). The sample set was divided into two subsets, one for training and one for testing the ability of the trained classifier to correctly assign classes. Artificial neural networks clearly outperformed all other classifiers and are effective tools for this particular classification problem. Classical parametric models were inadequate due to the nature of the predictor variables (high dimensional and not linearly correlated), and feature space of the classes (overlapping). The other non-parametric methods tested, k-nearest neighbor and fuzzy logic, would need considerable improvement to match the neural network effectiveness, but further work, possibly combining certain aspects of the three non-parametric methods, may be justified. ?? 2006 Elsevier Ltd. All rights reserved.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Computers and Geosciences","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1016/j.cageo.2006.08.011","issn":"00983004","usgsCitation":"Dubois, M., Bohling, G.C., and Chakrabarti, S., 2007, Comparison of four approaches to a rock facies classification problem: Computers & Geosciences, v. 33, no. 5, p. 599-617, https://doi.org/10.1016/j.cageo.2006.08.011.","startPage":"599","endPage":"617","numberOfPages":"19","costCenters":[],"links":[{"id":212885,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.cageo.2006.08.011"},{"id":240445,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"33","issue":"5","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059f864e4b0c8380cd4d086","contributors":{"authors":[{"text":"Dubois, M.K.","contributorId":50695,"corporation":false,"usgs":true,"family":"Dubois","given":"M.K.","email":"","affiliations":[],"preferred":false,"id":423922,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Bohling, Geoffrey C.","contributorId":43109,"corporation":false,"usgs":false,"family":"Bohling","given":"Geoffrey","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":423920,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Chakrabarti, S.","contributorId":43173,"corporation":false,"usgs":true,"family":"Chakrabarti","given":"S.","email":"","affiliations":[],"preferred":false,"id":423921,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70029703,"text":"70029703 - 2007 - Biological uptake of polychlorinated biphenyls by Macoma balthica from sediment amended with activated carbon","interactions":[],"lastModifiedDate":"2023-08-22T11:16:52.003308","indexId":"70029703","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1571,"text":"Environmental Toxicology and Chemistry","active":true,"publicationSubtype":{"id":10}},"title":"Biological uptake of polychlorinated biphenyls by Macoma balthica from sediment amended with activated carbon","docAbstract":"This work characterizes the efficacy of activated carbon amendment in reducing polychlorinated biphenyl (PCB) bioavailability to clams (Macoma balthica) from field-contaminated sediment (Hunters Point Naval Shipyard, San Francisco Bay, CA, USA). Test methods were developed for the use of clams to investigate the effects of sediment amendment on biological uptake. Sediment was mixed with activated carbon for one month. Bioaccumulation tests (28 d) were employed to assess the relationships between carbon dose and carbon particle size on observed reductions in clam biological uptake of PCBs. Extraction and cleanup protocols were developed for the clam tissue. Efficacy of activated carbon treatment was found to increase with both increasing carbon dose and decreasing carbon particle size. Average reductions in bioaccumulation of 22, 64, and 84% relative to untreated Hunters Point sediment were observed for carbon amendments of 0.34, 1.7, and 3.4%, respectively. Average bioaccumulation reductions of 41, 73, and 89% were observed for amendments (dose = 1.7% dry wt) with carbon particles of 180 to 250, 75 to 180, and 25 to 75 μm, respectively, in diameter, indicating kinetic phenomena in these tests. Additionally, a biodynamic model quantifying clam PCB uptake from water and sediment as well as loss through elimination provided a good fit of experimental data. Model predictions suggest that the sediment ingestion route contributed 80 to 95% of the PCB burdens in the clams.
Translocation could be used as a tool in conservation of the threatened Mojave Desert Tortoise (Gopherus agassizii) by moving individuals from harm's way and into areas where they could contribute to conservation of the species. Numerous factors may affect the success of translocations, including the conditions experienced by tortoises in holding facilities while awaiting translocation. The tortoises available for our translocation study had been provided supplemental water during their years spent in a captive holding facility, potentially inducing carelessness in water conservation. In addition to generally investigating the efficacy of translocation, we compared the effects of continuing with the effects of ceasing the holding facility's water supplementation regimen. After exposure to one of the two water regimens, all tortoises were given the opportunity to hydrate immediately prior to release. We examined behavior, body mass, carapace length, movement, and mortality of tortoises for two activity seasons following release to the wild. Water supplementation was correlated with high rates of carapace growth and distant movements by males after release. Lengthy movements following translocation may be problematic for conservation planning, but this should be evaluated in light of the goals and circumstances of each translocation project. Although the mortality rate was 21.4% in 1997, data suggest that drought conditions at the site rather than the translocation itself negatively affected the tortoises. None of the tortoises died during their second season at the site. Our results indicate that translocation should be considered a useful tool in conservation of the Desert Tortoise.
","language":"English","publisher":"Elsevier Science","doi":"10.1016/j.biocon.2006.11.022","issn":"00063207","usgsCitation":"Field, K., Tracy, C., Medica, P., Marlow, R., and Corn, P., 2007, Return to the wild: Translocation as a tool in conservation of the desert tortoise (Gopherus agassizii): Biological Conservation, v. 136, no. 2, p. 232-245, https://doi.org/10.1016/j.biocon.2006.11.022.","productDescription":"14 p.","startPage":"232","endPage":"245","numberOfPages":"14","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":481,"text":"Northern Rocky Mountain Science Center","active":true,"usgs":true}],"links":[{"id":240478,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":212913,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.biocon.2006.11.022"}],"country":"United States","state":"Nevada","otherGeospatial":"Mojave 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\"}}]}","volume":"136","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505aac2de4b0c8380cd86bd1","contributors":{"authors":[{"text":"Field, K.J.","contributorId":30451,"corporation":false,"usgs":true,"family":"Field","given":"K.J.","affiliations":[],"preferred":false,"id":423928,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Tracy, C.R.","contributorId":73524,"corporation":false,"usgs":true,"family":"Tracy","given":"C.R.","email":"","affiliations":[],"preferred":false,"id":423930,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Medica, P.A.","contributorId":77079,"corporation":false,"usgs":true,"family":"Medica","given":"P.A.","email":"","affiliations":[],"preferred":false,"id":423931,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Marlow, R.W.","contributorId":20276,"corporation":false,"usgs":true,"family":"Marlow","given":"R.W.","email":"","affiliations":[],"preferred":false,"id":423927,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Corn, P.S.","contributorId":63751,"corporation":false,"usgs":true,"family":"Corn","given":"P.S.","affiliations":[],"preferred":false,"id":423929,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70029705,"text":"70029705 - 2007 - Recent climate trends and implications for water resources in the Catskill Mountain region, New York, USA","interactions":[],"lastModifiedDate":"2016-08-17T11:54:12","indexId":"70029705","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2342,"text":"Journal of Hydrology","active":true,"publicationSubtype":{"id":10}},"title":"Recent climate trends and implications for water resources in the Catskill Mountain region, New York, USA","docAbstract":"Climate scientists have concluded that the earth’s surface air temperature warmed by 0.6 °C during the 20th century, and that warming induced by increasing concentrations of greenhouse gases is likely to continue in the 21st century, accompanied by changes in the hydrologic cycle. Climate change has important implications in the Catskill region of southeastern New York State, because the region is a source of water supply for New York City. We used the non-parametric Mann–Kendall test to evaluate annual, monthly, and multi-month trends in air temperature, precipitation amount, stream runoff, and potential evapotranspiration (PET) in the region during 1952–2005 based on data from 9 temperature sites, 12 precipitation sites, and 8 stream gages. A general pattern of warming temperatures and increased precipitation, runoff, and PET is evident in the region. Regional annual mean air temperature increased significantly by 0.6 °C per 50 years during the period; the greatest increases and largest number of significant upward trends were in daily minimum air temperature. Daily maximum air temperature showed the greatest increase during February through April, whereas minimum air temperature showed the greatest increase during May through September. Regional mean precipitation increased significantly by 136 mm per 50 years, nearly double that of the regional mean increase in runoff, which was not significant. Regional mean PET increased significantly by 19 mm per 50 years, about one-seventh that of the increase in precipitation amount, and broadly consistent with increased runoff during 1952–2005, despite the lack of significance in the mean regional runoff trend. Peak snowmelt as approximated by the winter–spring center of volume of stream runoff generally shifted from early April at the beginning of the record to late March at the end of the record, consistent with a decreasing trend in April runoff and an increasing trend in maximum March air temperature. This change indicates an increased supply of water to reservoirs earlier in the year. Additionally, the supply of water to reservoirs at the beginning of winter is greater as indicated by the timing of the greatest increases in precipitation and runoff—both occurred during summer and fall. The future balance between changes in air temperature and changes in the timing and amount of precipitation in the region will have important implications for the available water supply in the region.
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2007 - Isotopic characterization of three groundwater recharge sources and inferences for selected aquifers in the upper Klamath Basin of Oregon and California, USA","interactions":[],"lastModifiedDate":"2012-03-12T17:21:05","indexId":"70029706","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2342,"text":"Journal of Hydrology","active":true,"publicationSubtype":{"id":10}},"title":"Isotopic characterization of three groundwater recharge sources and inferences for selected aquifers in the upper Klamath Basin of Oregon and California, USA","docAbstract":"Stable isotope (??D and ??18O) signatures of three principal groundwater recharge areas in the 21,000-km2 upper Klamath Basin are used to infer recharge sources for aquifers in the interior parts of the basin. Two of the principal recharge areas, the Cascade Range on the western and southern margin of the basin and uplands along the eastern margin, are defined by mean annual precipitation that exceeds approximately 60 cm. A third recharge area coincides with the extensive irrigation canal system in the south central part of the basin. The stable isotope signature for Cascade Range groundwater falls near the global meteoric water line (GMWL). The stable isotope signature for the groundwater of the eastern basin uplands also falls near the GMWL, but is depleted in heavy isotopes relative to the Cascade Range groundwater. The stable isotope signature for water from the irrigation canal system deviates from the GMWL in a manner indicative of fractionation by evaporation. Groundwater provenance was previously unknown for two aquifers of interest: that supplying deep (225-792 m), large-capacity irrigation wells along the Oregon-California border, and that of the geothermal system near Klamath Falls. Groundwater produced by the deep irrigation wells along the Oregon-California border appears to be a mixture of eastern-basin groundwater and water with an evaporative isotopic signature. The component with an evaporative isotopic signature appears in some places to consist of infiltrated irrigation water. Chloride data suggest that much of the component with the evaporative isotopic signature may be coming from an adjacent subbasin. After accounting for the 18O shift common in geothermal waters, isotope data suggest that the geothermal groundwater in the upper Klamath Basin may emanate from the eastern basin uplands. Findings demonstrate that stable isotope and chloride data can illuminate certain details of a regional groundwater flow system in a complex geologic setting where other hydrologic data are ambiguous. ?? 2007 Elsevier B.V. All rights reserved.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of Hydrology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1016/j.jhydrol.2006.12.008","issn":"00221694","usgsCitation":"Palmer, P., Gannett, M.W., and Hinkle, S., 2007, Isotopic characterization of three groundwater recharge sources and inferences for selected aquifers in the upper Klamath Basin of Oregon and California, USA: Journal of Hydrology, v. 336, no. 1-2, p. 17-29, https://doi.org/10.1016/j.jhydrol.2006.12.008.","startPage":"17","endPage":"29","numberOfPages":"13","costCenters":[],"links":[{"id":212943,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.jhydrol.2006.12.008"},{"id":240512,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"336","issue":"1-2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a3f9be4b0c8380cd64661","contributors":{"authors":[{"text":"Palmer, P.C.","contributorId":86972,"corporation":false,"usgs":true,"family":"Palmer","given":"P.C.","email":"","affiliations":[],"preferred":false,"id":423937,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Gannett, M. W.","contributorId":75569,"corporation":false,"usgs":true,"family":"Gannett","given":"M.","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":423936,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Hinkle, S.R.","contributorId":74778,"corporation":false,"usgs":true,"family":"Hinkle","given":"S.R.","email":"","affiliations":[],"preferred":false,"id":423935,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70029707,"text":"70029707 - 2007 - PVTx properties of the CO2-H2O and CO2-H2O-NaCl systems below 647 K: assessment of experimental data and thermodynamic models","interactions":[],"lastModifiedDate":"2015-04-13T10:38:13","indexId":"70029707","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1213,"text":"Chemical Geology","active":true,"publicationSubtype":{"id":10}},"title":"PVTx properties of the CO2-H2O and CO2-H2O-NaCl systems below 647 K: assessment of experimental data and thermodynamic models","docAbstract":"Evaluation of CO2 sequestration in formation brine or in seawater needs highly accurate experimental data or models of pressure–volume–temperature-composition (PVTx) properties for the CO2–H2O and CO2–H2O–NaCl systems. This paper presents a comprehensive review of the experimental PVTx properties and the thermodynamic models of these two systems. The following conclusions are drawn from the review: (1) About two-thirds of experimental data are consistent with each other, where the uncertainty in liquid volumes is within 0.5%, and that in gas volumes within 2%. However, this accuracy is not sufficient for assessing CO2 sequestration. Among the data sets for liquids, only a few are available for accurate modeling of CO2 sequestration. These data have an error of about 0.1% on average, roughly covering from 273 to 642 K and from 1 to 35 MPa; (2) There is a shortage of volumetric data of saturated vapor phase. (3) There are only a few data sets for the ternary liquids, and they are inconsistent with each other, where only a couple of data sets can be used to test a predictive density model for CO2 sequestration; (4) Although there are a few models with accuracy close to that of experiments, none of them is accurate enough for CO2 sequestration modeling, which normally needs an accuracy of density better than 0.1%. Some calculations are made available on www.geochem-model.org.
","language":"English","publisher":"Elsevier","doi":"10.1016/j.chemgeo.2006.11.011","issn":"00092541","usgsCitation":"Hu, J., Duan, Z., Zhu, C., and Chou, I., 2007, PVTx properties of the CO2-H2O and CO2-H2O-NaCl systems below 647 K: assessment of experimental data and thermodynamic models: Chemical Geology, v. 238, no. 3-4, p. 249-267, https://doi.org/10.1016/j.chemgeo.2006.11.011.","productDescription":"19 p.","startPage":"249","endPage":"267","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[],"links":[{"id":240513,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":212944,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.chemgeo.2006.11.011"}],"volume":"238","issue":"3-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a7387e4b0c8380cd770ca","contributors":{"authors":[{"text":"Hu, Jiawen","contributorId":41630,"corporation":false,"usgs":true,"family":"Hu","given":"Jiawen","email":"","affiliations":[],"preferred":false,"id":423939,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Duan, Zhenhao","contributorId":71302,"corporation":false,"usgs":true,"family":"Duan","given":"Zhenhao","email":"","affiliations":[],"preferred":false,"id":423941,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Zhu, Chen","contributorId":6244,"corporation":false,"usgs":true,"family":"Zhu","given":"Chen","email":"","affiliations":[],"preferred":false,"id":423938,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Chou, I.-M. 0000-0001-5233-6479","orcid":"https://orcid.org/0000-0001-5233-6479","contributorId":44283,"corporation":false,"usgs":true,"family":"Chou","given":"I.-M.","affiliations":[{"id":245,"text":"Eastern Mineral and Environmental Resources Science Center","active":true,"usgs":true}],"preferred":false,"id":423940,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70029709,"text":"70029709 - 2007 - Human influence on California fire regimes","interactions":[],"lastModifiedDate":"2012-03-12T17:21:09","indexId":"70029709","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1450,"text":"Ecological Applications","active":true,"publicationSubtype":{"id":10}},"title":"Human influence on California fire regimes","docAbstract":"Periodic wildfire maintains the integrity and species composition of many ecosystems, including the mediterranean-climate shrublands of California. However, human activities alter natural fire regimes, which can lead to cascading ecological effects. Increased human ignitions at the wildland-urban interface (WUI) have recently gained attention, but fire activity and risk are typically estimated using only biophysical variables. Our goal was to determine how humans influence fire in California and to examine whether this influence was linear, by relating contemporary (2000) and historic (1960-2000) fire data to both human and biophysical variables. Data for the human variables included fine-resolution maps of the WUI produced using housing density and land cover data. Interface WUI, where development abuts wildland vegetation, was differentiated from intermix WUI, where development intermingles with wildland vegetation. Additional explanatory variables included distance to WUI, population density, road density, vegetation type, and ecoregion. All data were summarized at the county level and analyzed using bivariate and multiple regression methods. We found highly significant relationships between humans and fire on the contemporary landscape, and our models explained fire frequency (R2 = 0.72) better than area burned (R2 = 0.50). Population density, intermix WUI, and distance to WUI explained the most variability in fire frequency, suggesting that the spatial pattern of development may be an important variable to consider when estimating fire risk. We found nonlinear effects such that fire frequency and area burned were highest at intermediate levels of human activity, but declined beyond certain thresholds. Human activities also explained change in fire frequency and area burned (1960-2000), but our models had greater explanatory power during the years 1960-1980, when there was more dramatic change in fire frequency. Understanding wildfire as a function of the spatial arrangement of ignitions and fuels on the landscape, in addition to nonlinear relationships, will be important to fire managers and conservation planners because fire risk may be related to specific levels of housing density that can be accounted for in land use planning. With more fires occurring in close proximity to human infrastructure, there may also be devastating ecological impacts if development continues to grow farther into wildland vegetation. ?? 2007 by the Ecological Society of America.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Ecological Applications","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1890/06-1128.1","issn":"10510761","usgsCitation":"Syphard, A., Radeloff, V.C., Keeley, J., Hawbaker, T., Clayton, M., Stewart, S.I., and Hammer, R.B., 2007, Human influence on California fire regimes: Ecological Applications, v. 17, no. 5, p. 1388-1402, https://doi.org/10.1890/06-1128.1.","startPage":"1388","endPage":"1402","numberOfPages":"15","costCenters":[],"links":[{"id":212997,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1890/06-1128.1"},{"id":240575,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"17","issue":"5","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a327fe4b0c8380cd5e858","contributors":{"authors":[{"text":"Syphard, A.D.","contributorId":68950,"corporation":false,"usgs":true,"family":"Syphard","given":"A.D.","email":"","affiliations":[],"preferred":false,"id":423947,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Radeloff, V. C.","contributorId":58467,"corporation":false,"usgs":false,"family":"Radeloff","given":"V.","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":423946,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Keeley, Jon E. 0000-0002-4564-6521","orcid":"https://orcid.org/0000-0002-4564-6521","contributorId":69082,"corporation":false,"usgs":true,"family":"Keeley","given":"Jon E.","affiliations":[],"preferred":false,"id":423948,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Hawbaker, T. J.","contributorId":98118,"corporation":false,"usgs":true,"family":"Hawbaker","given":"T. J.","affiliations":[],"preferred":false,"id":423950,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Clayton, M.K.","contributorId":38365,"corporation":false,"usgs":true,"family":"Clayton","given":"M.K.","email":"","affiliations":[],"preferred":false,"id":423945,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Stewart, S. I.","contributorId":99779,"corporation":false,"usgs":false,"family":"Stewart","given":"S.","email":"","middleInitial":"I.","affiliations":[],"preferred":false,"id":423951,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Hammer, R. B.","contributorId":77744,"corporation":false,"usgs":false,"family":"Hammer","given":"R.","email":"","middleInitial":"B.","affiliations":[],"preferred":false,"id":423949,"contributorType":{"id":1,"text":"Authors"},"rank":7}]}} ,{"id":70029714,"text":"70029714 - 2007 - Correcting acoustic Doppler current profiler discharge measurement bias from moving-bed conditions without global positioning during the 2004 Glen Canyon Dam controlled flood on the Colorado River","interactions":[],"lastModifiedDate":"2012-03-12T17:21:38","indexId":"70029714","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2622,"text":"Limnology and Oceanography: Methods","active":true,"publicationSubtype":{"id":10}},"title":"Correcting acoustic Doppler current profiler discharge measurement bias from moving-bed conditions without global positioning during the 2004 Glen Canyon Dam controlled flood on the Colorado River","docAbstract":"Discharge measurements were made by acoustic Doppler current profiler at two locations on the Colorado River during the 2004 controlled flood from Glen Canyon Dam, Arizona. Measurement hardware and software have constantly improved from the 1980s such that discharge measurements by acoustic profiling instruments are now routinely made over a wide range of hydrologic conditions. However, measurements made with instruments deployed from moving boats require reliable boat velocity data for accurate measurements of discharge. This is normally accomplished by using special acoustic bottom track pings that sense instrument motion over bottom. While this method is suitable for most conditions, high current flows that produce downstream bed sediment movement create a condition known as moving bed that will bias velocities and discharge to lower than actual values. When this situation exists, one solution is to determine boat velocity with satellite positioning information. Another solution is to use a lower frequency instrument. Discharge measurements made during the 2004 Glen Canyon controlled flood were subject to moving-bed conditions and frequent loss of bottom track. Due to site conditions and equipment availability, the measurements were conducted without benefit of external positioning information or lower frequency instruments. This paper documents and evaluates several techniques used to correct the resulting underestimated discharge measurements. One technique produces discharge values in good agreement with estimates from numerical model and measured hydrographs during the flood. ?? 2007, by the American Society of Limnology and Oceanography, Inc.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Limnology and Oceanography: Methods","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","issn":"15415856","usgsCitation":"Gartner, J.W., and Ganju, N., 2007, Correcting acoustic Doppler current profiler discharge measurement bias from moving-bed conditions without global positioning during the 2004 Glen Canyon Dam controlled flood on the Colorado River: Limnology and Oceanography: Methods, v. 5, no. JUN, p. 156-162.","startPage":"156","endPage":"162","numberOfPages":"7","costCenters":[],"links":[{"id":240641,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"5","issue":"JUN","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059fc1ee4b0c8380cd4e11d","contributors":{"authors":[{"text":"Gartner, J. W.","contributorId":81903,"corporation":false,"usgs":false,"family":"Gartner","given":"J.","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":423973,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Ganju, N. K. 0000-0002-1096-0465","orcid":"https://orcid.org/0000-0002-1096-0465","contributorId":64782,"corporation":false,"usgs":true,"family":"Ganju","given":"N. K.","affiliations":[],"preferred":false,"id":423972,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70029717,"text":"70029717 - 2007 - Latin hypercube approach to estimate uncertainty in ground water vulnerability","interactions":[],"lastModifiedDate":"2012-03-12T17:21:39","indexId":"70029717","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1861,"text":"Ground Water","active":true,"publicationSubtype":{"id":10}},"title":"Latin hypercube approach to estimate uncertainty in ground water vulnerability","docAbstract":"A methodology is proposed to quantify prediction uncertainty associated with ground water vulnerability models that were developed through an approach that coupled multivariate logistic regression with a geographic information system (GIS). This method uses Latin hypercube sampling (LHS) to illustrate the propagation of input error and estimate uncertainty associated with the logistic regression predictions of ground water vulnerability. Central to the proposed method is the assumption that prediction uncertainty in ground water vulnerability models is a function of input error propagation from uncertainty in the estimated logistic regression model coefficients (model error) and the values of explanatory variables represented in the GIS (data error). Input probability distributions that represent both model and data error sources of uncertainty were simultaneously sampled using a Latin hypercube approach with logistic regression calculations of probability of elevated nonpoint source contaminants in ground water. The resulting probability distribution represents the prediction intervals and associated uncertainty of the ground water vulnerability predictions. The method is illustrated through a ground water vulnerability assessment of the High Plains regional aquifer. Results of the LHS simulations reveal significant prediction uncertainties that vary spatially across the regional aquifer. Additionally, the proposed method enables a spatial deconstruction of the prediction uncertainty that can lead to improved prediction of ground water vulnerability. ?? 2007 National Ground Water Association.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Ground Water","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1111/j.1745-6584.2006.00298.x","issn":"0017467X","usgsCitation":"Gurdak, J., McCray, J., Thyne, G., and Qi, S., 2007, Latin hypercube approach to estimate uncertainty in ground water vulnerability: Ground Water, v. 45, no. 3, p. 348-361, https://doi.org/10.1111/j.1745-6584.2006.00298.x.","startPage":"348","endPage":"361","numberOfPages":"14","costCenters":[],"links":[{"id":213084,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1111/j.1745-6584.2006.00298.x"},{"id":240673,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"45","issue":"3","noUsgsAuthors":false,"publicationDate":"2007-03-20","publicationStatus":"PW","scienceBaseUri":"505a4580e4b0c8380cd6738a","contributors":{"authors":[{"text":"Gurdak, J.J.","contributorId":35119,"corporation":false,"usgs":true,"family":"Gurdak","given":"J.J.","email":"","affiliations":[],"preferred":false,"id":423983,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"McCray, J.E.","contributorId":31985,"corporation":false,"usgs":true,"family":"McCray","given":"J.E.","affiliations":[],"preferred":false,"id":423982,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Thyne, G.","contributorId":20983,"corporation":false,"usgs":true,"family":"Thyne","given":"G.","affiliations":[],"preferred":false,"id":423981,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Qi, S.L.","contributorId":76140,"corporation":false,"usgs":true,"family":"Qi","given":"S.L.","email":"","affiliations":[],"preferred":false,"id":423984,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70029718,"text":"70029718 - 2007 - Comparison of the dust distributions in the innermost comae of comets-1P/Halley and 19P/Borrelly spacecraft observations","interactions":[],"lastModifiedDate":"2012-03-12T17:21:07","indexId":"70029718","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3083,"text":"Planetary and Space Science","active":true,"publicationSubtype":{"id":10}},"title":"Comparison of the dust distributions in the innermost comae of comets-1P/Halley and 19P/Borrelly spacecraft observations","docAbstract":"We present a comparative study of the inner comae of comets 1P/Halley and 19P/Borrelly using data from the Halley Multicolour Camera (HMC) onboard Giotto and the Miniature Integrated Camera and Spectrometer onboard Deep Space 1 (DS1). We show that the dust brightness dependence as a function of radial distance is different for both comets. We suggest that optical depth or fragmentation effects dominate the brightness distribution at comet 1P/Halley whereas acceleration or non-point source geometry effects dominate at comet 19P/Borrelly. The nightside profiles of comet 19P/Borrelly suggest a continuing non-radial outflow from the nucleus out to several tens of kilometres. This modifies the observed dayside to nightside brightness ratio with distance and offers a further constraint on dust emission models. By setting up a linear system of equations to fit the dust intensity distribution, better fits could be obtained by incorporating acceleration into the equation of free-radial outflow. Finally, we estimate the dust production rate of 19P/Borrelly at the time of DS1 encounter as no higher than 324 kg/s based on comparisons with HMC intensity measurements. ?? 2007 Elsevier Ltd. All rights reserved.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Planetary and Space Science","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1016/j.pss.2006.12.004","issn":"00320633","usgsCitation":"Ho, T., Thomas, N., Boice, D.C., Combi, M., Soderblom, L., and Tenishev, V., 2007, Comparison of the dust distributions in the innermost comae of comets-1P/Halley and 19P/Borrelly spacecraft observations: Planetary and Space Science, v. 55, no. 7-8, p. 974-985, https://doi.org/10.1016/j.pss.2006.12.004.","startPage":"974","endPage":"985","numberOfPages":"12","costCenters":[],"links":[{"id":212648,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.pss.2006.12.004"},{"id":240167,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"55","issue":"7-8","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059f89ae4b0c8380cd4d1f7","contributors":{"authors":[{"text":"Ho, T.-M.","contributorId":101434,"corporation":false,"usgs":true,"family":"Ho","given":"T.-M.","email":"","affiliations":[],"preferred":false,"id":423989,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Thomas, N.","contributorId":72490,"corporation":false,"usgs":true,"family":"Thomas","given":"N.","email":"","affiliations":[],"preferred":false,"id":423988,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Boice, D. C.","contributorId":103043,"corporation":false,"usgs":false,"family":"Boice","given":"D.","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":423990,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Combi, M.","contributorId":43171,"corporation":false,"usgs":true,"family":"Combi","given":"M.","email":"","affiliations":[],"preferred":false,"id":423987,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Soderblom, L.A. 0000-0002-0917-853X","orcid":"https://orcid.org/0000-0002-0917-853X","contributorId":6139,"corporation":false,"usgs":true,"family":"Soderblom","given":"L.A.","affiliations":[],"preferred":false,"id":423985,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Tenishev, V.","contributorId":23337,"corporation":false,"usgs":true,"family":"Tenishev","given":"V.","email":"","affiliations":[],"preferred":false,"id":423986,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}} ,{"id":70029719,"text":"70029719 - 2007 - Shoreline change as a proxy for subaerial beach volume change","interactions":[],"lastModifiedDate":"2018-04-09T12:36:18","indexId":"70029719","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2220,"text":"Journal of Coastal Research","active":true,"publicationSubtype":{"id":10}},"title":"Shoreline change as a proxy for subaerial beach volume change","docAbstract":"It is difficult and expensive to calculate changes in sediment volume for large sections of sandy beaches. Shoreline change could be a useful proxy for volume change because it can be collected quickly and relatively easily over long distances. In this paper, we summarize several studies that find a high correlation between shoreline change and subaerial volume change. We also examine three new data sets. On Cape Cod, Massachusetts, the correlation coefficients between the time series of shoreline change and subaerial volume change at two locations are 0.73 and 0.96. On Assateague Island, the correlation coefficient between along-coast variations in shoreline change and subaerial volume change is 0.71. On the Outer Banks of North Carolina, the average correlation coefficient between temporal variations in shoreline change and subaerial volume change is 0.84. For spatial variations, the average correlation coefficient is 0.88. It is therefore concluded that shoreline change is a useful proxy for subaerial volume change.
","language":"English","publisher":"Coastal Education and Research Foundation","doi":"10.2112/05-0442.1","issn":"07490208","usgsCitation":"Farris, A., and List, J., 2007, Shoreline change as a proxy for subaerial beach volume change: Journal of Coastal Research, v. 23, no. 3, p. 740-748, https://doi.org/10.2112/05-0442.1.","productDescription":"9 p.","startPage":"740","endPage":"748","costCenters":[{"id":186,"text":"Coastal and Marine Geology Program","active":true,"usgs":true},{"id":678,"text":"Woods Hole Coastal and Marine Science Center","active":true,"usgs":true}],"links":[{"id":477100,"rank":1,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.2112/05-0442.1","text":"Publisher Index Page"},{"id":240168,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Massachusetts, Maryland, North Carolina, Virginia","city":"Cape Cod","otherGeospatial":"Assateague Island, Outer Banks","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -76.5,35.75 ], [ -76.5,42.083333 ], [ -69.833333,42.083333 ], [ -69.833333,35.75 ], [ -76.5,35.75 ] ] ] } } ] }","volume":"23","issue":"3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505b8e91e4b08c986b3189f1","contributors":{"authors":[{"text":"Farris, Amy S.","contributorId":28075,"corporation":false,"usgs":true,"family":"Farris","given":"Amy S.","affiliations":[],"preferred":false,"id":423992,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"List, Jeffrey H. jlist@usgs.gov","contributorId":2416,"corporation":false,"usgs":true,"family":"List","given":"Jeffrey H.","email":"jlist@usgs.gov","affiliations":[{"id":186,"text":"Coastal and Marine Geology Program","active":true,"usgs":true}],"preferred":false,"id":423991,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70029729,"text":"70029729 - 2007 - Understanding shallow gas occurrences in the Gulf of Lions","interactions":[],"lastModifiedDate":"2023-08-08T11:11:14.774827","indexId":"70029729","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1742,"text":"Geo-Marine Letters","active":true,"publicationSubtype":{"id":10}},"title":"Understanding shallow gas occurrences in the Gulf of Lions","docAbstract":"New coring data have been acquired along the western Gulf of Lions showing anomalous concentrations of methane (up to 95,700 ppm) off the Rhône prodelta and the head of the southern canyons Lacaze-Duthiers and Cap de Creus. Sediment cores were acquired with box and kasten cores during 2004–2005 on several EuroSTRATAFORM cruises. Anomalous methane concentrations are discussed and integrated with organic carbon data. Sampled sites include locations where previous surveys identified acoustic anomalies in high-resolution seismic profiles, which may be related to the presence of gas. Interpretation of the collected data has enabled us to discuss the nature of shallow gas along the Gulf of Lions, and its association with recent sedimentary dynamics. The Rhône prodelta flood deposits deliver significant amounts of terrigenous organic matter that can be rapidly buried, effectively removing this organic matter from aerobic oxidation and biological uptake, and leading to the potential for methanogenesis with burial. Away from the flood-related sediments off the Rhône delta, the organic matter is being reworked and remineralized on its way along the western coast of the Gulf of Lions, with the result that the recent deposits in the canyon contain little reactive carbon. In the southernmost canyons, Lacaze-Duthiers and Cap de Creus, the gas analyses show relatively little shallow gas in the core samples. Samples with anomalous gas (up to 5,000 ppm methane) are limited to local areas where the samples also show higher amounts of organic matter. The anomalous samples at the head of the southern canyons may be related to methanogenesis of recent drape or of older sidewall canyon infills.