Relative changes in the level of Lake Baikal, amounting to hundreds of meters in Quaternary time, are well documented. Data presented here show that tectonic displacements of the lake outlet or former shoreline features are entirely sufficient to explain these relative lake-level changes. In contrast, the morphology and hydrology of the lake make its level hydrologically insensitive to climate change. Available evidence indicates that, throughout the past several hundred thousand years, Lake Baikal was a dilute, through-flowing lake controlled by the level of its outlet. On the basis of geologic data alone, climatic effects on lake level, whatever their magnitude, are difficult to separate from those caused by active rift tectonism. However, consideration of (1) the hydrologic budget of the lake and (2) the configuration of the outlet suggests that potential lake-level fluctuations due solely to climate change were less than about 2 m.
The quality of water in the Upper Floridan aquifer near Valdosta, Georgia is affected locally by discharge of Withlacoochee River water through sinkholes in the river bed. Data on transient tracers and other dissolved substances, including Cl−, 3H, tritiogenic helium-3 (3He), chlorofluorocarbons (CFC-11, CFC-12, CFC-113), organic C (DOC), O2 (DO), H2S, CH4, δ18O, δD, and 14C were investigated as tracers of Withlacoochee River water in the Upper Floridan aquifer. The concentrations of all tracers were affected by dilution and mixing. Dissolved Cl−, δ18O, δD, CFC-12, and the quantity (3H+3He) are stable in water from the Upper Floridan aquifer, whereas DOC, DO, H2S, CH4, 14C, CFC-11, and CFC-113 are affected by microbial degradation and other geochemical processes occurring within the aquifer. Groundwater mixing fractions were determined by using dissolved Cl− and δ18O data, recognizing 3 end-member water types in the groundwater mixtures: (1) Withlacoochee River water (δ18O=−2.5±0.3‰, Cl−=12.2±2 mg/l), (2) regional infiltration water (δ18O=−4.2±0.1‰, Cl−=2.3±0.1 mg/l), and (3) regional paleowater resident in the Upper Floridan aquifer (δ18O=−3.4±0.1‰, Cl−=2.6±0.1 mg/l) (uncertainties are ±1σ). Error simulation procedures were used to define uncertainties in mixing fractions. Fractions of river water in groundwater range from 0 to 72% and average 10%. The influence of river-water discharge on the quality of water in the Upper Floridan aquifer was traced from the sinkhole area on the Withlacoochee River 25 km SE in the direction of regional groundwater flow. Infiltration of water is most significant to the N and NW of Valdosta, but becomes negligible to the S and SE in the direction of general thickening of post-Eocene confining beds overlying the Upper Floridan aquifer.
Thiosulfate (S2O32−), polythionate (SxO62−), dissolved sulfide (H2S), and sulfate (SO42−) concentrations in thirty-nine alkaline and acidic springs in Yellowstone National Park (YNP) were determined. The analyses were conducted on site, using ion chromatography for thiosulfate, polythionate, and sulfate, and using colorimetry for dissolved sulfide. Thiosulfate was detected at concentrations typically less than 2 μmol/L in neutral and alkaline chloride springs with low sulfate concentrations (Cl−/SO42− > 25). The thiosulfate concentration levels are about one to two orders of magnitude lower than the concentration of dissolved sulfide in these springs. In most acid sulfate and acid sulfate-chloride springs (Cl−/SO42− < 10), thiosulfate concentrations were also typically lower than 2 μmol/L. However, in some chloride springs enriched with sulfate (Cl−/SO42− between 10 to 25), thiosulfate was found at concentrations ranging from 9 to 95 μmol/L, higher than the concentrations of dissolved sulfide in these waters. Polythionate was detected only in Cinder Pool, Norris Geyser basin, at concentrations up to 8 μmol/L, with an average S-chain-length from 4.1 to 4.9 sulfur atoms.
The results indicate that no thiosulfate occurs in the deeper parts of the hydrothermal system. Thiosulfate may form, however, from (1) hydrolysis of native sulfur by hydrothermal solutions in the shallower parts (<50 m) of the system, (2) oxidation of dissolved sulfide upon mixing of a deep hydrothermal water with aerated shallow groundwater, and (3) the oxidation of dissolved sulfide by dissolved oxygen upon discharge of the hot spring. Upon discharge of a sulfide-containing hydrothermal water, oxidation proceeds rapidly as atmospheric oxygen enters the water. The transfer of oxygen is particularly effective if the hydrothermal discharge is turbulent and has a large surface area.
","language":"English","publisher":"Elsevier","doi":"10.1016/S0016-7037(98)00269-5","issn":"00167037","usgsCitation":"Xu, Y., Schoonen, M., Nordstrom, D.K., Cunningham, K., and Ball, J., 1998, Sulfur geochemistry of hydrothermal waters in Yellowstone National Park: I. The origin of thiosulfate in hot spring waters: Geochimica et Cosmochimica Acta, v. 62, no. 23-24, p. 3729-3743, https://doi.org/10.1016/S0016-7037(98)00269-5.","productDescription":"15 p.","startPage":"3729","endPage":"3743","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":230948,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":206847,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/S0016-7037(98)00269-5"}],"country":"United States","state":"Wyoming","otherGeospatial":"Yellowstone National Park","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -111.09374999999999,\n 42.50450285299051\n ],\n [\n -107.6220703125,\n 42.50450285299051\n ],\n [\n -107.6220703125,\n 44.99588261816546\n ],\n [\n -111.09374999999999,\n 44.99588261816546\n ],\n [\n -111.09374999999999,\n 42.50450285299051\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"62","issue":"23-24","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505b9dd6e4b08c986b31dafd","contributors":{"authors":[{"text":"Xu, Y.","contributorId":47816,"corporation":false,"usgs":true,"family":"Xu","given":"Y.","email":"","affiliations":[],"preferred":false,"id":386448,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Schoonen, M.A.A.","contributorId":82479,"corporation":false,"usgs":true,"family":"Schoonen","given":"M.A.A.","email":"","affiliations":[],"preferred":false,"id":386450,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Nordstrom, D. Kirk 0000-0003-3283-5136 dkn@usgs.gov","orcid":"https://orcid.org/0000-0003-3283-5136","contributorId":749,"corporation":false,"usgs":true,"family":"Nordstrom","given":"D.","email":"dkn@usgs.gov","middleInitial":"Kirk","affiliations":[{"id":37277,"text":"WMA - Earth System Processes Division","active":true,"usgs":true},{"id":5044,"text":"National Research Program - Central Branch","active":true,"usgs":true}],"preferred":false,"id":386451,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Cunningham, K.M.","contributorId":100020,"corporation":false,"usgs":true,"family":"Cunningham","given":"K.M.","email":"","affiliations":[],"preferred":false,"id":386452,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Ball, J.W.","contributorId":67507,"corporation":false,"usgs":true,"family":"Ball","given":"J.W.","affiliations":[],"preferred":false,"id":386449,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70020501,"text":"70020501 - 1998 - Bacillus arsenicoselenatis, sp. nov., and Bacillus selenitireducens, sp. nov.: Two haloalkaliphiles from Mono Lake, California that respire oxyanions of selenium and arsenic","interactions":[],"lastModifiedDate":"2019-01-30T09:09:03","indexId":"70020501","displayToPublicDate":"1998-01-01T00:00:00","publicationYear":"1998","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":889,"text":"Archives of Microbiology","active":true,"publicationSubtype":{"id":10}},"title":"Bacillus arsenicoselenatis, sp. nov., and Bacillus selenitireducens, sp. nov.: Two haloalkaliphiles from Mono Lake, California that respire oxyanions of selenium and arsenic","docAbstract":"Two gram-positive anaerobic bacteria (strains E1H and MLS10) were isolated from the anoxic muds of Mono Lake, California, an alkaline, hypersaline, arsenic-rich water body. Both grew by dissimilatory reduction of As(V) to As(III) with the concomitant oxidation of lactate to acetate plus CO2. Bacillus arsenicoselenatis (strain E1H) is a spore-forming rod that also grew by dissimilatory reduction of Se(VI) to Se(IV). Bacillus selenitireducens (strain MLS 10) is a short, non-spore-forming rod that grew by dissimilatory reduction of Se(IV) to Se(0). When the two isolates were cocultured, a complete reduction of Se(VI) to Se(0) was achieved. Both isolates are alkaliphiles and had optimal specific growth rates in the pH range of 8.5-10. Strain E1H had a salinity optimum at 60 g 1-1 NaCl, while strain MLS10 had optimal growth at lower salinities (24-60 g 1-1 NaCl). Both strains have limited abilities to grow with electron donors and acceptors other than those given above. Strain MLS10 demonstrated weak growth as a microaerophile and was also capable of fermentative growth on glucose, while strain E1H is a strict anaerobe. Comparative 16S rRNA gene sequence analysis placed the two isolates with other Bacillus spp. in the low G+C gram-positive group of bacteria.","language":"English","publisher":"Springer","doi":"10.1007/s002030050673","issn":"03028933","usgsCitation":"Switzer, B.J., Burns, B.A., Buzzelli, J., Stolz, J., and Oremland, R., 1998, Bacillus arsenicoselenatis, sp. nov., and Bacillus selenitireducens, sp. nov.: Two haloalkaliphiles from Mono Lake, California that respire oxyanions of selenium and arsenic: Archives of Microbiology, v. 171, no. 1, p. 19-30, https://doi.org/10.1007/s002030050673.","productDescription":"12 p.","startPage":"19","endPage":"30","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":230985,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":206856,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/s002030050673"}],"volume":"171","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059ef8be4b0c8380cd4a2f6","contributors":{"authors":[{"text":"Switzer, Blum J.","contributorId":33076,"corporation":false,"usgs":true,"family":"Switzer","given":"Blum","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":386454,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Burns, Bindi A.","contributorId":24522,"corporation":false,"usgs":true,"family":"Burns","given":"Bindi","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":386453,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Buzzelli, J.","contributorId":33882,"corporation":false,"usgs":true,"family":"Buzzelli","given":"J.","email":"","affiliations":[],"preferred":false,"id":386455,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Stolz, J.F.","contributorId":94022,"corporation":false,"usgs":true,"family":"Stolz","given":"J.F.","email":"","affiliations":[],"preferred":false,"id":386456,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Oremland, R.S.","contributorId":97512,"corporation":false,"usgs":true,"family":"Oremland","given":"R.S.","email":"","affiliations":[],"preferred":false,"id":386457,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70020502,"text":"70020502 - 1998 - Isotopic composition of ice cores and meltwater from upper fremont glacier and Galena Creek rock glacier, Wyoming","interactions":[],"lastModifiedDate":"2019-02-04T08:11:53","indexId":"70020502","displayToPublicDate":"1998-01-01T00:00:00","publicationYear":"1998","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1768,"text":"Geografiska Annaler, Series A: Physical Geography","active":true,"publicationSubtype":{"id":10}},"title":"Isotopic composition of ice cores and meltwater from upper fremont glacier and Galena Creek rock glacier, Wyoming","docAbstract":"Meltwater runoff from glaciers can result from various sources, including recent precipitation and melted glacial ice. Determining the origin of the meltwater from glaciers through isotopic analysis can provide information about such things as the character and distribution of ablation on glaciers.
A 9.4 m ice core and meltwater were collected in 1995 and 1996 at the glacigenic Galena Creek rock glacier in Wyoming's Absaroka Mountains. Measurements of chlorine‐36 (36Cl), tritium (3H), sulphur‐35 (35S), and delta oxygen‐18 (δ18O) were compared to similar measurements from an ice core taken from the Upper Fremont Glacier in the Wind River Range of Wyoming collected in 1991–95. Meltwater samples from three sites on the rock glacier yielded 36Cl concentrations that ranged from 2.1±1.0×106 to 5.8±0.3×106 atoms/l. The ice‐core 36Cl concentrations from Galena Creek ranged from 3.4±0.3×105 to 1.0±0.1×106 atoms/l. Analysis of an ice core from the Upper Fremont Glacier yielded 36Cl concentrations of 1.2±0.2×106 and 5.2±0.2×106 atoms/l for pre‐1940 ice and between 2 ×106 and 3×106 atoms/l for post‐1980 ice. Purdue's PRIME Lab analyzed the ice from the Upper Fremont Glacier. The highest concentration of 36Cl in the ice was 77±2×106 atoms/l and was deposited during the peak of atmospheric nuclear weapons testing in the late 1950s. This is an order of magnitude greater than the largest measured concentration from both the Upper Fremont Glacier ice core that was not affected by weapons testing fallout and the ice core collected from the Galena Creek rock glacier.
Tritium concentrations from the rock glacier ranged from 9.2±0.6 to 13.2±0.8 tritium units (TU) in the meltwater to −1.3±1.3 TU in the ice core. Concentrations of 3H in the Upper Fremont Glacier ice core ranged from 0 TU in the ice older than 50 years to 6–12 TU in the ice deposited in the last 10 years. The maximum 3H concentration in ice from the Upper Fremont Glacier deposited in the early 1960s during peak weapons testing fallout for this isotope was 360 TU.
One meltwater sample from the rock glacier was analyzed for 35S with a measured concentration of 5.4±1.0 millibecquerel per liter (mBeq/l). Modern precipitation in the Rocky Mountains contains 35S from 10 to 40 mBeq/L. The δ18O results in meltwater from the Galena Creek rock glacier (−17.40±0.1 to −17.98±0.1 per mil) are similar to results for modern precipitation in the Rocky Mountains. Comparison of these isotopic concentrations from the two glaciers suggest that the meltwater at the Galena Creek site is composed mostly of melted snow and rain that percolates through the rock debris that covers the glacier. Additionally, this water from the rock debris is much younger (less than two years) than the reported age of about 2000 years for the subsurface ice at the mid‐glacier coring site. Thus the meltwater from the Galena Creek rock glacier is composed primarily of melted surface snow and rain water rather than melted glacier ice, supporting previous estimates of slow ablation rates beneath the surface debris of the rock glacier.
","language":"English","publisher":"Taylor & Francis","doi":"10.1111/j.0435-3676.1998.00044.x","issn":"04353676","usgsCitation":"Cecil, L., Green, J., Vogt, S., Michel, R., and Cottrell, G., 1998, Isotopic composition of ice cores and meltwater from upper fremont glacier and Galena Creek rock glacier, Wyoming: Geografiska Annaler, Series A: Physical Geography, v. 80, no. 3-4, p. 287-292, https://doi.org/10.1111/j.0435-3676.1998.00044.x.","productDescription":"6 p.","startPage":"287","endPage":"292","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":230986,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"80","issue":"3-4","noUsgsAuthors":false,"publicationDate":"2016-11-15","publicationStatus":"PW","scienceBaseUri":"505a3fa0e4b0c8380cd6468f","contributors":{"authors":[{"text":"Cecil, L. DeWayne","contributorId":66856,"corporation":false,"usgs":true,"family":"Cecil","given":"L. DeWayne","affiliations":[],"preferred":false,"id":386460,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Green, J.R.","contributorId":31146,"corporation":false,"usgs":true,"family":"Green","given":"J.R.","email":"","affiliations":[],"preferred":false,"id":386458,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Vogt, S.","contributorId":86126,"corporation":false,"usgs":true,"family":"Vogt","given":"S.","email":"","affiliations":[],"preferred":false,"id":386461,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Michel, R.","contributorId":101042,"corporation":false,"usgs":true,"family":"Michel","given":"R.","affiliations":[],"preferred":false,"id":386462,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Cottrell, G.","contributorId":58417,"corporation":false,"usgs":true,"family":"Cottrell","given":"G.","email":"","affiliations":[],"preferred":false,"id":386459,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70020518,"text":"70020518 - 1998 - Relation of usage to the occurrence of cotton and rice herbicides in three streams of the Mississippi delta","interactions":[],"lastModifiedDate":"2019-02-04T10:04:31","indexId":"70020518","displayToPublicDate":"1998-01-01T00:00:00","publicationYear":"1998","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1565,"text":"Environmental Science & Technology","onlineIssn":"1520-5851","printIssn":"0013-936X","active":true,"publicationSubtype":{"id":10}},"title":"Relation of usage to the occurrence of cotton and rice herbicides in three streams of the Mississippi delta","docAbstract":"During the 1995 growing season water samples were collected from three streams in the Mississippi delta and were analyzed for selected cotton and rice herbicides and metabolites. The purpose of the study was to relate the use of these herbicides to their occurrence in streams of the delta, to describe how the geochemistry of these herbicides affects their occurrence, and to report the occurrence of selected metabolites. The total concentration of eight herbicides and their metabolites exceeded 5 μg/L throughout most of the growing season with a median total of 15 μg/L. The order of occurrence was molinate > fluometuron > cyanazine > metolachlor > norflurazon > atrazine > prometryn > propanil. The distribution and duration of the total herbicide concentration found in this study are much different from that found in regional studies of herbicides in the U.S. Midwest. In the Midwest, the total herbicide concentration in surface water showed a sharp peak during the spring immediately after application of herbicides to crops, followed by a gradual decrease. In the Mississippi delta, the total herbicide concentration in surface water was more sustained, with multiple peaks due to different application times and postemergent applications to cotton and rice.
Fluxes of CO2 and CH4 through a seasonal snowpack were measured in and adjacent to a subalpine wetland in Rocky Mountain National Park, Colorado. Gas diffusion through the snow was controlled by gas production or consumption in the soil and by physical snowpack properties. The snowpack insulated soils from cold midwinter air temperatures allowing microbial activity to continue through the winter. All soil types studied were net sources of CO2 to the atmosphere through the winter, whereas saturated soils in the wetland center were net emitters of CH4 and soils adjacent to the wetland were net CH4 consumers. Most sites showed similar temporal patterns in winter gas fluxes; the lowest fluxes occurred in early winter, and maximum fluxes occurred at the onset of snowmelt. Temporal changes in fluxes probably were related to changes in soil-moisture conditions and hydrology because soil temperatures were relatively constant under the snowpack. Average winter CO2 fluxes were 42.3, 31.2, and 14.6 mmol m−2 d−1 over dry, moist, and saturated soils, respectively, which accounted for 8 to 23% of the gross annual CO2emissions from these soils. Average winter CH4 fluxes were −0.016, 0.274, and 2.87 mmol m−2 d−1over dry, moist, and saturated soils, respectively. Microbial activity under snow cover accounted for 12% of the annual CH4 consumption in dry soils and 58 and 12% of the annual CH4 emitted from moist and saturated soils, respectively. The observed ranges in CO2 and CH4 flux through snow indicated that winter fluxes are an important part of the annual carbon budget in seasonally snow-covered terrains.
","language":"English","publisher":"AGU Publications","doi":"10.1029/98GB02313","issn":"08866236","usgsCitation":"Mast, M.A., Wickland, K.P., Striegl, R.G., and Clow, D.W., 1998, Winter fluxes of CO2 and CH4 from subalpine soils in Rocky Mountain National Park, Colorado: Global Biogeochemical Cycles, v. 12, no. 4, p. 607-620, https://doi.org/10.1029/98GB02313.","productDescription":"14 p.","startPage":"607","endPage":"620","numberOfPages":"14","costCenters":[{"id":191,"text":"Colorado Water Science Center","active":true,"usgs":true}],"links":[{"id":487315,"rank":1,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1029/98gb02313","text":"Publisher Index Page"},{"id":231105,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"12","issue":"4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505bd14ee4b08c986b32f356","contributors":{"authors":[{"text":"Mast, M. Alisa 0000-0001-6253-8162 mamast@usgs.gov","orcid":"https://orcid.org/0000-0001-6253-8162","contributorId":827,"corporation":false,"usgs":true,"family":"Mast","given":"M.","email":"mamast@usgs.gov","middleInitial":"Alisa","affiliations":[{"id":191,"text":"Colorado Water Science Center","active":true,"usgs":true}],"preferred":true,"id":386633,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Wickland, Kimberly P. 0000-0002-6400-0590 kpwick@usgs.gov","orcid":"https://orcid.org/0000-0002-6400-0590","contributorId":1835,"corporation":false,"usgs":true,"family":"Wickland","given":"Kimberly","email":"kpwick@usgs.gov","middleInitial":"P.","affiliations":[{"id":5044,"text":"National Research Program - Central Branch","active":true,"usgs":true},{"id":37277,"text":"WMA - Earth System Processes Division","active":true,"usgs":true},{"id":36183,"text":"Hydro-Ecological Interactions Branch","active":true,"usgs":true}],"preferred":true,"id":386631,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Striegl, Robert G. 0000-0002-8251-4659 rstriegl@usgs.gov","orcid":"https://orcid.org/0000-0002-8251-4659","contributorId":1630,"corporation":false,"usgs":true,"family":"Striegl","given":"Robert","email":"rstriegl@usgs.gov","middleInitial":"G.","affiliations":[{"id":5044,"text":"National Research Program - Central Branch","active":true,"usgs":true},{"id":37277,"text":"WMA - Earth System Processes Division","active":true,"usgs":true},{"id":36183,"text":"Hydro-Ecological Interactions Branch","active":true,"usgs":true},{"id":200,"text":"Coop Res Unit Seattle","active":true,"usgs":true}],"preferred":false,"id":386634,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Clow, David W. 0000-0001-6183-4824 dwclow@usgs.gov","orcid":"https://orcid.org/0000-0001-6183-4824","contributorId":1671,"corporation":false,"usgs":true,"family":"Clow","given":"David","email":"dwclow@usgs.gov","middleInitial":"W.","affiliations":[{"id":191,"text":"Colorado Water Science Center","active":true,"usgs":true}],"preferred":true,"id":386632,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70020555,"text":"70020555 - 1998 - Development and testing of a contamination potential mapping system for a portion of the General Separations Area, Savannah River Site, South Carolina","interactions":[],"lastModifiedDate":"2017-01-18T12:48:56","indexId":"70020555","displayToPublicDate":"1998-01-01T00:00:00","publicationYear":"1998","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1539,"text":"Environmental Geology","active":true,"publicationSubtype":{"id":10}},"title":"Development and testing of a contamination potential mapping system for a portion of the General Separations Area, Savannah River Site, South Carolina","docAbstract":"A methodology was developed to evaluate and map the contamination potential or aquifer sensitivity of the upper groundwater flow system of a portion of the General Separations Area (GSA) at the Department of Energy's Savannah River Site (SRS) in South Carolina. A Geographic Information System (GIS) was used to integrate diverse subsurface geologic data, soils data, and hydrology utilizing a stack-unit mapping approach to construct mapping layers. This is the first time that such an approach has been used to delineate the hydrogeology of a coastal plain environment. Unit surface elevation maps were constructed for the tops of six Tertiary units derived from over 200 boring logs. Thickness or isopach maps were created for five hydrogeologic units by differencing top and basal surface elevations. The geologic stack-unit map was created by stacking the five isopach maps and adding codes for each stack-unit polygon. Stacked-units were rated according to their hydrogeologic properties and ranked using a logarithmic approach (utility theory) to establish a contamination potential index. Colors were assigned to help display relative importance of stacked-units in preventing or promoting transport of contaminants. The sensitivity assessment included the effects of surface soils on contaminants which are particularly important for evaluating potential effects from surface spills. Hydrogeologic/hydrologic factors did not exhibit sufficient spatial variation to warrant incorporation into contamination potential assessment. Development of this contamination potential mapping system provides a useful tool for site planners, environmental scientists, and regulatory agencies.A methodology was developed to evaluate and map the contamination potential or aquifer sensitivity of the upper groundwater flow system of a portion of the General Separations Area (GSA) at the Department of Energy's Savannah River Site (SRS) in South Carolina. A Geographic Information System (GIS) was used to integrate diverse subsurface geologic data, soils data, and hydrology utilizing a stack-unit mapping approach to construct mapping layers. This is the first time that such an approach has been used to delineate the hydrogeology of a coastal plain environment. Unit surface elevation maps were constructed for the tops of six Tertiary units derived from over 200 boring logs. Thickness or isopach maps were created for five hydrogeologic units by differencing top and basal surface elevations. The geologic stack-unit map was created by stacking the five isopach maps and adding codes for each stack-unit polygon. Stacked-units were rated according to their hydrogeologic properties and ranked using a logarithmic approach (utility theory) to establish a contamination potential index. Colors were assigned to help display relative importance of stacked-units in preventing or promoting transport of contaminants. The sensitivity assessment included the effects of surface soils on contaminants which are particularly important for evaluating potential effects from surface spills. Hydrogeologic/hydrologic factors did not exhibit sufficient spatial variation to warrant incorporation into contamination potential assessment. Development of this contamination potential mapping system provides a useful tool for site planners, environmental scientists, and regulatory agencies.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Environmental Geology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","publisher":"Springer-Verlag GmbH & Company KG","publisherLocation":"Berlin, Germany","doi":"10.1007/s002540050313","issn":"09430105","usgsCitation":"Rine, J., Berg, R.C., Shafer, J., Covington, E., Reed, J., Bennett, C., and Trudnak, J., 1998, Development and testing of a contamination potential mapping system for a portion of the General Separations Area, Savannah River Site, South Carolina: Environmental Geology, v. 35, no. 4, p. 263-277, https://doi.org/10.1007/s002540050313.","startPage":"263","endPage":"277","numberOfPages":"15","costCenters":[{"id":13634,"text":"South Atlantic Water Science Center","active":true,"usgs":true}],"links":[{"id":231305,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":206942,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/s002540050313"}],"country":"United States","state":"South Carolina","otherGeospatial":"Savannah River Site","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -81.9854736328125,\n 32.87382044499353\n ],\n [\n -81.9854736328125,\n 33.42341844641943\n ],\n [\n -81.26174926757812,\n 33.42341844641943\n ],\n [\n -81.26174926757812,\n 32.87382044499353\n ],\n [\n -81.9854736328125,\n 32.87382044499353\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"35","issue":"4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a0027e4b0c8380cd4f5fc","contributors":{"authors":[{"text":"Rine, J.M.","contributorId":53145,"corporation":false,"usgs":true,"family":"Rine","given":"J.M.","email":"","affiliations":[],"preferred":false,"id":386682,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Berg, R. C.","contributorId":11673,"corporation":false,"usgs":true,"family":"Berg","given":"R.","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":386680,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Shafer, J.M.","contributorId":72995,"corporation":false,"usgs":true,"family":"Shafer","given":"J.M.","email":"","affiliations":[],"preferred":false,"id":386686,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Covington, E.R.","contributorId":58157,"corporation":false,"usgs":true,"family":"Covington","given":"E.R.","email":"","affiliations":[],"preferred":false,"id":386684,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Reed, J.K.","contributorId":38031,"corporation":false,"usgs":true,"family":"Reed","given":"J.K.","email":"","affiliations":[],"preferred":false,"id":386681,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Bennett, C.B.","contributorId":61308,"corporation":false,"usgs":true,"family":"Bennett","given":"C.B.","email":"","affiliations":[],"preferred":false,"id":386685,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Trudnak, J.E.","contributorId":56938,"corporation":false,"usgs":true,"family":"Trudnak","given":"J.E.","email":"","affiliations":[],"preferred":false,"id":386683,"contributorType":{"id":1,"text":"Authors"},"rank":7}]}} ,{"id":70020570,"text":"70020570 - 1998 - Hydrologic influence on methane and carbon dioxide dynamics at two north-central Minnesota lakes","interactions":[],"lastModifiedDate":"2018-01-30T20:57:33","indexId":"70020570","displayToPublicDate":"1998-01-01T00:00:00","publicationYear":"1998","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2620,"text":"Limnology and Oceanography","active":true,"publicationSubtype":{"id":10}},"title":"Hydrologic influence on methane and carbon dioxide dynamics at two north-central Minnesota lakes","docAbstract":"Annual emissions of (CH4 + CO2) to the atmosphere were proportional to net hydrologic inputs of C, mostly by groundwater, at two lakes in the Shingobee River watershed in north-central Minnesota. Williams Lake (WL), a closed basin lake near the top of the watershed, had a hydraulic residence time of 2-4 yr and groundwater exchange of about +2 mol dissolved inorganic carbon (DIC) and -0.1 mol dissolved organic carbon (DOC) m-2 lake area yr-1. The Shingobee River flows through Shingobee Lake (SL) that had a hydraulic residence of 0.3-0.4 yr and received net groundwater plus surface-water inputs of +5.3 to +7.3 mol DIC and fewer than +1.3 mol (DOC + particulate organic carbon) m-2 yr-1. Approximately 60-80% of net annual C input to SL was from groundwater. Lake storage of CH4 and CO2 was greatest in late winter, with maximum emissions to the atmosphere immediately following ice melt. The lakes emitted CH4 continuously during open water, having annual losses of -1.6 mol CH4 m-2 yr-1 at WL and -1.9 mol CH4 m-2 yr-1 at SL. Although the WL epilimnion was CO2 depleted throughout summer, net annual CO2 exchange with the atmosphere was near zero because springtime emission offset summertime uptake. CO2 supersaturation resulted in emission of -8.0 mol CO2 m-2 yr-1 at SL.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Limnology and Oceanography","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","issn":"00243590","usgsCitation":"Striegl, R.G., and Michmerhuizen, C., 1998, Hydrologic influence on methane and carbon dioxide dynamics at two north-central Minnesota lakes: Limnology and Oceanography, v. 43, no. 7, p. 1519-1529.","startPage":"1519","endPage":"1529","numberOfPages":"11","costCenters":[],"links":[{"id":230909,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"43","issue":"7","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a3639e4b0c8380cd6053b","contributors":{"authors":[{"text":"Striegl, Robert G. 0000-0002-8251-4659 rstriegl@usgs.gov","orcid":"https://orcid.org/0000-0002-8251-4659","contributorId":1630,"corporation":false,"usgs":true,"family":"Striegl","given":"Robert","email":"rstriegl@usgs.gov","middleInitial":"G.","affiliations":[{"id":37277,"text":"WMA - Earth System Processes Division","active":true,"usgs":true},{"id":200,"text":"Coop Res Unit Seattle","active":true,"usgs":true},{"id":5044,"text":"National Research Program - Central Branch","active":true,"usgs":true},{"id":36183,"text":"Hydro-Ecological Interactions Branch","active":true,"usgs":true}],"preferred":false,"id":386726,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Michmerhuizen, C.M.","contributorId":6205,"corporation":false,"usgs":true,"family":"Michmerhuizen","given":"C.M.","email":"","affiliations":[],"preferred":false,"id":386725,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70020579,"text":"70020579 - 1998 - Changes in production and respiration during a spring phytoplankton bloom in San Francisco Bay, California, USA: Implications for net ecosystem metabolism","interactions":[],"lastModifiedDate":"2019-02-01T06:52:35","indexId":"70020579","displayToPublicDate":"1998-01-01T00:00:00","publicationYear":"1998","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":"Changes in production and respiration during a spring phytoplankton bloom in San Francisco Bay, California, USA: Implications for net ecosystem metabolism","docAbstract":"We present results of an intensive sampling program designed to measure weekly changes in ecosystem respiration (oxygen consumption in the water column and sediments) around the 1996 spring bloom in South San Francisco Bay, California, USA. Measurements were made at a shallow site (2 m, where mean photic depth was 60% of the water column height) and a deep site (15 m, mean photic depth was only 20% of the water column). We also estimated phytoplankton primary production weekly at both sites to develop estimates of net oxygen flux as the sum of pelagic production (PP), pelagic respiration (PR) and benthic respiration (BR). Over the 14 wk period from February 5 to May 14, PP ranged from 2 to 210, PR from 9 to 289, and BR from 0.1 to 48 mmol O2 m-2 d-1, illustrating large variability of estuarine oxygen fluxes at the weekly time scale. Pelagic production exceeded total respiration at the shallow site, but not at the deep site, demonstrating that the shallow domains are net autotrophic but the deep domains are net heterotrophic, even during the period of the spring bloom. If we take into account the potential primary production by benthic microalgae, the estuary as a whole is net autotrophic during spring, net heterotrophic during the nonbloom seasons, and has a balanced net metabolism over a full annual period. The seasonal shift from net autotrophy to heterotrophy during the transition from spring to summer was accompanied by a large shift from dominance by pelagic respiration to dominance by benthic respiration. This suggests that changes in net ecosystem metabolism can reflect changes in the pathways of energy flow in shallow coastal ecosystems.
","language":"English","publisher":"Inter-Research","doi":"10.3354/meps172001","issn":"01718630","usgsCitation":"Caffrey, J., Cloern, J., and Grenz, C., 1998, Changes in production and respiration during a spring phytoplankton bloom in San Francisco Bay, California, USA: Implications for net ecosystem metabolism: Marine Ecology Progress Series, v. 172, p. 1-12, https://doi.org/10.3354/meps172001.","productDescription":"12 p.","startPage":"1","endPage":"12","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":154,"text":"California Water Science Center","active":true,"usgs":true},{"id":552,"text":"San Francisco Bay-Delta","active":false,"usgs":true},{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true},{"id":5079,"text":"Pacific Regional Director's Office","active":true,"usgs":true}],"links":[{"id":479869,"rank":1,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.3354/meps172001","text":"Publisher Index Page"},{"id":231031,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":266006,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.3354/meps172001"}],"country":"United States","state":"California","otherGeospatial":"San Francisco Bay","volume":"172","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059f420e4b0c8380cd4bb68","contributors":{"authors":[{"text":"Caffrey, J.M.","contributorId":98750,"corporation":false,"usgs":true,"family":"Caffrey","given":"J.M.","email":"","affiliations":[],"preferred":false,"id":386756,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Cloern, J. E.","contributorId":59453,"corporation":false,"usgs":true,"family":"Cloern","given":"J. E.","affiliations":[],"preferred":false,"id":386755,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Grenz, C.","contributorId":40753,"corporation":false,"usgs":true,"family":"Grenz","given":"C.","affiliations":[],"preferred":false,"id":386754,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70020580,"text":"70020580 - 1998 - Plant taphonomy in incised valleys: Implications for interpreting paleoclimate from fossil plants","interactions":[],"lastModifiedDate":"2024-01-12T14:50:18.73407","indexId":"70020580","displayToPublicDate":"1998-01-01T00:00:00","publicationYear":"1998","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1796,"text":"Geology","active":true,"publicationSubtype":{"id":10}},"title":"Plant taphonomy in incised valleys: Implications for interpreting paleoclimate from fossil plants","docAbstract":"Paleoclimatic interpretations of the Upper Triassic Chinle Formation (Colorado Plateau) based on plants conflict with those based on the sedimentary rocks. The plants are suggestive of a humid, equable climate, whereas the rocks are more consistent with deposition under highly seasonal precipitation and ground-water conditions. Fossil plant assemblages are limited to the lower members of the Chinle Formation, which were deposited within incised valleys that were cut into underlying Lower to Middle Triassic and older rocks. In contrast, the upper members of the formation, which were deposited across the fluvial plain after the incised valleys were filled, have few preserved fossil plants. The taphonomic characteristics of the plant fossil assemblages, within the stratigraphic and hydrologic context of the incised valley-fill sequence, explain the vertical and lateral distribution of these assemblages. The depositional, hydrological, and near-surface geochemical conditions were more conducive to preservation of the plants. Fossil plant assemblages in fully terrestrial incised-valley fills should be taphonomically biased toward riparian wetland environments. If those assemblages are used to interpret paleoclimate, the paleoclimatic interpretations will also be biased. The bias may be particularly strong in climates such as those during deposition of the Chinle Formation, when the riparian wetlands may reflect local hydrologic conditions rather than regional climate, and should be taken into account when using these types of plant assemblages in paleoclimatic interpretations.
A conceptual model of the patterns and residence times of groundwater seepage to gaining streams indicates that groundwater seepage originates from sources that are both near and far from the stream. Consequently, the age of groundwater seepage across a stream-channel transect increases from its banks to its center and becomes progressively older with distance downstream. A groundwater flow model and particle-tracking analysis of the Cohansey River Basin in the New Jersey Coastal Plain supports this conceptual model and demonstrates that the orientation of the stream channels with respect to the regional groundwater flow direction, and the heterogeneities of the aquifer and stream-channel patterns, can shift source area locations and distributions of groundwater residence time from those expected. Groundwater samples collected from stream transects were analyzed for nitrogen, representative of widespread agricultural land use in the basin in recent decades, and for chlorofluorocarbons, used to estimate groundwater ages. The patterns of nitrogen concentration and the age of groundwater entering the stream channel corroborate model inferences. The conceptual model of groundwater seepage to streams presented herein is relevant to unconfined aquifer systems with gaining streams and demonstrates how nonpoint-source contaminants are transported to streams by groundwater. Results are useful for the design of programs needed to monitor stream-water quality.
","language":"English","publisher":"American Geophysical Union","doi":"10.1029/98WR02472","usgsCitation":"Modica, E., Buxton, H., and Plummer, N., 1998, Evaluating the source and residence times of groundwater seepage to streams, New Jersey Coastal Plain: Water Resources Research, v. 34, no. 11, p. 2797-2810, https://doi.org/10.1029/98WR02472.","productDescription":"14 p.","startPage":"2797","endPage":"2810","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":479828,"rank":1,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1029/98wr02472","text":"Publisher Index Page"},{"id":231107,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"New Jersey","volume":"34","issue":"11","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a0bffe4b0c8380cd529b6","contributors":{"authors":[{"text":"Modica, E.","contributorId":69735,"corporation":false,"usgs":true,"family":"Modica","given":"E.","affiliations":[],"preferred":false,"id":386770,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Buxton, H. T.","contributorId":67873,"corporation":false,"usgs":true,"family":"Buxton","given":"H. T.","affiliations":[],"preferred":false,"id":386769,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Plummer, Niel 0000-0002-4020-1013 nplummer@usgs.gov","orcid":"https://orcid.org/0000-0002-4020-1013","contributorId":190100,"corporation":false,"usgs":true,"family":"Plummer","given":"Niel","email":"nplummer@usgs.gov","affiliations":[{"id":436,"text":"National Research Program - Eastern Branch","active":true,"usgs":true}],"preferred":true,"id":386771,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70020591,"text":"70020591 - 1998 - Flow of river water into a karstic limestone aquifer: 2. Dating the young fraction in groundwater mixtures in the Upper Floridan aquifer near Valdosta, Georgia","interactions":[],"lastModifiedDate":"2019-02-04T08:44:50","indexId":"70020591","displayToPublicDate":"1998-01-01T00:00:00","publicationYear":"1998","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":835,"text":"Applied Geochemistry","active":true,"publicationSubtype":{"id":10}},"title":"Flow of river water into a karstic limestone aquifer: 2. Dating the young fraction in groundwater mixtures in the Upper Floridan aquifer near Valdosta, Georgia","docAbstract":"Tritium/helium-3 (3H/3He) and chlorofluorocarbon (CFCs, CFC–11, CFC–12, CFC–113) data are used to date the young fraction in groundwater mixtures from a karstic limestone aquifer near Valdosta, Georgia, where regional paleowater in the Upper Floridan aquifer receives recharge from two young sources—the flow of Withlacoochee River water through sinkholes in the river bed, and leakage of infiltration water through post-Eocene semi-confining beds above the Upper Floridan aquifer. In dating the young fraction of mixtures using CFCs, it is necessary to reconstruct the CFC concentration that was in the young fraction prior to mixing. The 3H/3He age is independent of the extent of dilution with older (3H-free and 3Hetrit-free) water. The groundwater mixtures are designated as Type-1 for mixtures of regional paleowater and regional infiltration water and Type-2 for mixtures containing more than approximately 4% of river water. The fractions of regional paleowater, regional infiltration water, and Withlacoochee River water in the groundwater mixtures were determined from Cl− and δ18O data for water from the Upper Floridan aquifer at Valdosta, Georgia.
The chlorofluorocarbons CFC–11 and CFC–113 are removed by microbial degradation and/or sorption processes in most anaerobic (Type-2) groundwater at Valdosta, but are present in some aerobic Type-1 water. CFC–12 persists in both SO4-reducing and methanogenic water. The very low detection limits for CFCs (approximately 0.3 pg kg−1) permitted CFC–11 and CFC–12 dating of the fraction of regional infiltration water in Type-1 mixtures, and CFC-12 dating of the river-water fraction in Type-2 mixtures. Overall, approximately 50% of the 85 water samples obtained from the Upper Floridan aquifer have CFC–12-based ages of the young fraction that are consistent with the 3H concentration of the groundwater. Because of uncertainties associated with very low 3H and 3He content in dilute mixtures, 3H/3He dating is limited to the river-water fraction in Type-2 mixtures containing more than about 10% river water. Of the 41 water samples measured for 3H/3He dating, dilution of 3H and low 3He concentration limited 3H/3He dating to 16 mixtures in which 3H/3He ages are defined with errors ranging from ±2 to ±7.5 a (1 σ). After correction for dilution with (assumed) CFC-free regional infiltration water and regional paleowater in the Upper Floridan aquifer, adjusted CFC–12 ages agree with 3H/3He ages within 5 a or less in 7 of the 9 co-dated Type-2 mixtures.
Tritium data and dating based on both CFC–11 and CFC–12 in Type-1 mixtures indicate that travel times of infiltration water through the overlying Post-Eocene semi-confining beds exceed 35 a. The CFC and 3H/3He dating indicate that the river fraction in most groundwater entered the groundwater reservoir in the past 20 to 30 a. Few domestic and municipal supply wells sampled intercept water younger than 5 a. Calculated velocities of river water in the Upper Floridan aquifer downgradient of the sinkhole area range from 0.4 to 8.2 m/d. Radiocarbon data indicate that ages of the regional paleowater are on the 10 000-a time scale. An average lag time of approximately 10 to 25 a is determined for discharge of groundwater from the surficial and intermediate aquifers above the Upper Floridan aquifer to the Withlacoochee River.
","language":"English","publisher":"Elsevier","doi":"10.1016/S0883-2927(98)00032-8","issn":"08832927","usgsCitation":"Plummer, N., Busenberg, E., Drenkard, S., Schlosser, P., Ekwurzel, B., Weppernig, R., McConnell, J.B., and Michel, R.L., 1998, Flow of river water into a karstic limestone aquifer: 2. Dating the young fraction in groundwater mixtures in the Upper Floridan aquifer near Valdosta, Georgia: Applied Geochemistry, v. 13, no. 8, p. 1017-1043, https://doi.org/10.1016/S0883-2927(98)00032-8.","productDescription":"27 p.","startPage":"1017","endPage":"1043","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":487347,"rank":10000,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1016/s0883-2927(98)00032-8","text":"Publisher Index Page"},{"id":231269,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":206928,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/S0883-2927(98)00032-8"}],"country":"United States","state":"Georgia","county":"Lowndes County 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P.","contributorId":106656,"corporation":false,"usgs":true,"family":"Schlosser","given":"P.","email":"","affiliations":[],"preferred":false,"id":386800,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Ekwurzel, B.","contributorId":27223,"corporation":false,"usgs":true,"family":"Ekwurzel","given":"B.","affiliations":[],"preferred":false,"id":386794,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Weppernig, R.","contributorId":57616,"corporation":false,"usgs":true,"family":"Weppernig","given":"R.","affiliations":[],"preferred":false,"id":386796,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"McConnell, J. B.","contributorId":25577,"corporation":false,"usgs":true,"family":"McConnell","given":"J.","email":"","middleInitial":"B.","affiliations":[],"preferred":false,"id":386793,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"Michel, R. L.","contributorId":86375,"corporation":false,"usgs":true,"family":"Michel","given":"R.","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":386798,"contributorType":{"id":1,"text":"Authors"},"rank":8}]}} ,{"id":70020592,"text":"70020592 - 1998 - Difluoromethane, a new and improved inhibitor of methanotrophy","interactions":[],"lastModifiedDate":"2023-01-12T21:07:41.228976","indexId":"70020592","displayToPublicDate":"1998-01-01T00:00:00","publicationYear":"1998","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":850,"text":"Applied and Environmental Microbiology","active":true,"publicationSubtype":{"id":10}},"title":"Difluoromethane, a new and improved inhibitor of methanotrophy","docAbstract":"Difluoromethane (HFC-32; DFM) is compared to acetylene and methyl fluoride as an inhibitor of methanotrophy in cultures and soils. DFM was found to be a reversible inhibitor of CH4 oxidation byMethylococcus capsulatus (Bath). Consumption of CH4 in soil was blocked by additions of low levels of DFM (0.03 kPa), and this inhibition was reversed by DFM removal. Although a small quantity of DFM was consumed during these incubations, its remaining concentration was sufficiently elevated to sustain inhibition. Methanogenesis in anaerobic soil slurries, including acetoclastic methanogenesis, was unaffected by levels of DFM which inhibit methanotrophy. Low levels of DFM (0.03 kPa) also inhibited nitrification and N2O production by soils. DFM is proposed as an improved inhibitor of CH4 oxidation over acetylene and/or methyl fluoride on the basis of its reversibility, its efficacy at low concentrations, its lack of inhibition of methanogenesis, and its low cost.
","language":"English","publisher":"American Society for Microbiology","doi":"10.1128/AEM.64.11.4357-4362.1998","issn":"00992240","usgsCitation":"Miller, L., Sasson, C., and Oremland, R., 1998, Difluoromethane, a new and improved inhibitor of methanotrophy: Applied and Environmental Microbiology, v. 64, no. 11, p. 4357-4362, https://doi.org/10.1128/AEM.64.11.4357-4362.1998.","productDescription":"6 p.","startPage":"4357","endPage":"4362","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":479726,"rank":2,"type":{"id":41,"text":"Open Access External Repository Page"},"url":"https://doi.org/10.1128/aem.64.11.4357-4362.1998","text":"External Repository"},{"id":231306,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"64","issue":"11","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a0114e4b0c8380cd4fab5","contributors":{"authors":[{"text":"Miller, L.G.","contributorId":32522,"corporation":false,"usgs":true,"family":"Miller","given":"L.G.","email":"","affiliations":[],"preferred":false,"id":386801,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Sasson, C.","contributorId":104663,"corporation":false,"usgs":true,"family":"Sasson","given":"C.","email":"","affiliations":[],"preferred":false,"id":386803,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Oremland, R.S.","contributorId":97512,"corporation":false,"usgs":true,"family":"Oremland","given":"R.S.","email":"","affiliations":[],"preferred":false,"id":386802,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70020594,"text":"70020594 - 1998 - Changes in the isotopic and chemical composition of ground water resulting from a recharge pulse from a sinking stream","interactions":[],"lastModifiedDate":"2018-12-21T07:52:32","indexId":"70020594","displayToPublicDate":"1998-01-01T00:00:00","publicationYear":"1998","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":"Changes in the isotopic and chemical composition of ground water resulting from a recharge pulse from a sinking stream","docAbstract":"The Little River, an ephemeral stream that drains a watershed of approximately 88 km2 in northern Florida, disappears into a series of sinkholes along the Cody Scarp and flows directly into the carbonate Upper Floridan aquifer, the source of water supply in northern Florida. The changes in the geochemistry of ground water caused by a major recharge pulse from the sinking stream were investigated using chemical and isotopic tracers and mass-balance modeling techniques. Nine monitoring wells were installed open to the uppermost part of the aquifer in areas near the sinks where numerous subterranean karst solution features were identified using ground penetrating radar. During high-flow conditions in the Little River, the chemistry of water in some of the monitoring wells changed, reflecting the mixing of river water with ground water. Rapid recharge of river water into some parts of the aquifer during high-flow conditions was indicated by enriched values of delta 18O and delta deuterium (-1.67 to -3.17 per mil and -9.2 to -15.6 per mil, respectively), elevated concentrations of tannic acid, higher (more radiogenic) 87Sr/86Sr ratios, and lower concentrations of 222Rn, silica, and alkalinity compared to low-flow conditions. The proportion of river water that mixed with ground water ranged from 0.10 to 0.67 based on binary mixing models using the tracers 18O, deuterium, tannic acid, silica, 222Rn, and 87Sr/86Sr. On the basis of mass-balance modeling during steady-state flow conditions, the dominant processes controlling carbon cycling in ground water are the dissolution of calcite and dolomite in aquifer material, and aerobic degradation of organic matter.The Little River of northern Florida disappears into a series of sinkholes along the Cody Scarp and flows directly into the carbonate Upper Floridan aquifer. The changes in the geochemistry of ground water caused by a major recharge pulse from the sinking stream were investigated using chemical and isotopic tracers and mass-balance modeling techniques. Nine monitoring wells were installed open to the uppermost part of the aquifer. During high-flow conditions in the Little River, the chemistry of water in some of the monitoring wells changed, reflecting the mixing of river water with ground water. Based on mass-balance modeling during steady-state flow conditions, it was found that the dominant processes controlling carbon cycling in ground water are the dissolution of calcite and dolomite in aquifer material, and aerobic degradation of organic matter.","language":"English","publisher":"Elsevier ","doi":"10.1016/S0022-1694(98)00236-4","issn":"00221694","usgsCitation":"Katz, B., Catches, J., Bullen, T., and Michel, R.L., 1998, Changes in the isotopic and chemical composition of ground water resulting from a recharge pulse from a sinking stream: Journal of Hydrology, v. 211, no. 1-4, p. 178-207, https://doi.org/10.1016/S0022-1694(98)00236-4.","productDescription":"30 p.","startPage":"178","endPage":"207","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":231343,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":206954,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/S0022-1694(98)00236-4"}],"volume":"211","issue":"1-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059f432e4b0c8380cd4bbcd","contributors":{"authors":[{"text":"Katz, B. G.","contributorId":82702,"corporation":false,"usgs":true,"family":"Katz","given":"B. G.","affiliations":[],"preferred":false,"id":386808,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Catches, J.S.","contributorId":75702,"corporation":false,"usgs":true,"family":"Catches","given":"J.S.","email":"","affiliations":[],"preferred":false,"id":386806,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Bullen, T.D.","contributorId":79911,"corporation":false,"usgs":true,"family":"Bullen","given":"T.D.","email":"","affiliations":[],"preferred":false,"id":386807,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Michel, R. L.","contributorId":86375,"corporation":false,"usgs":true,"family":"Michel","given":"R.","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":386809,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70020595,"text":"70020595 - 1998 - Type curves to determine the relative importance of advection and dispersion for solute and vapor transport","interactions":[],"lastModifiedDate":"2019-02-01T06:23:19","indexId":"70020595","displayToPublicDate":"1998-01-01T00:00:00","publicationYear":"1998","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":"Type curves to determine the relative importance of advection and dispersion for solute and vapor transport","docAbstract":"The relative importance of advection and dispersion for both solute and vapor transport can be determined from type curves or concentration, flux, or cumulative flux. The dimensionless form of the type curves provides a means to directly evaluate the importance of mass transport by advection relative to that of mass transport by diffusion and dispersion. Type curves based on an analytical solution to the advection-dispersion equation are plotted in terms of dimensionless time and Peclet number. Flux and cumulative flux type curves provide additional rationale for transport regime determination in addition to the traditional concentration type curves. The extension of type curves to include vapor transport with phase partitioning in the unsaturated zone is a new development. Type curves for negative Peclet numbers also are presented. A negative Peclet number characterizes a problem in which one direction of flow is toward the contamination source, and thereby diffusion and advection can act in opposite directions. Examples are the diffusion of solutes away from the downgradient edge of a pump-and-treat capture zone, the upward diffusion of vapors through the unsaturated zone with recharge, and the diffusion of solutes through a low hydraulic conductivity cutoff wall with an inward advective gradient.","largerWorkTitle":"Wiley","language":"English","doi":"10.1111/j.1745-6584.1998.tb02102.x","issn":"0017467X","usgsCitation":"Garges, J., and Baehr, A.L., 1998, Type curves to determine the relative importance of advection and dispersion for solute and vapor transport: Ground Water, v. 36, no. 6, p. 959-965, https://doi.org/10.1111/j.1745-6584.1998.tb02102.x.","productDescription":"7 p.","startPage":"959","endPage":"965","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":231344,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"36","issue":"6","noUsgsAuthors":false,"publicationDate":"2005-08-04","publicationStatus":"PW","scienceBaseUri":"5059fd1ce4b0c8380cd4e630","contributors":{"authors":[{"text":"Garges, J.A.","contributorId":8253,"corporation":false,"usgs":true,"family":"Garges","given":"J.A.","affiliations":[],"preferred":false,"id":386810,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Baehr, A. L.","contributorId":59831,"corporation":false,"usgs":true,"family":"Baehr","given":"A.","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":386811,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70020607,"text":"70020607 - 1998 - Noble gases, stable isotopes, and radiocarbon as tracers of flow in the Dakota aquifer, Colorado and Kansas","interactions":[],"lastModifiedDate":"2012-03-12T17:19:42","indexId":"70020607","displayToPublicDate":"1998-01-01T00:00:00","publicationYear":"1998","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":"Noble gases, stable isotopes, and radiocarbon as tracers of flow in the Dakota aquifer, Colorado and Kansas","docAbstract":"A suite of chemical and isotope tracers (dissolved noble gases, stable isotopes of water, radiocarbon, and CI) have been analyzed along a flow path in the Dakota aquifer system to determine likely recharge sources, ground water residence times, and the extent of mixing between local and intermediate flow systems, presumably caused by large well screens. Three water types were distinguished with the tracers, each having a very different history. Two of the water types were found in south-eastern Colorado where the Dakota is poorly confined. The tracer data suggest that the first group recharged locally during the last few thousand years and the second group was composed of ground water that recharged earlier during a cooler climate, presumably during the last glacial period (LGP) and mixed aged water. The paleotemperature record archived in this groundwater system indicates that south-eastern Colorado was about 5??C cooler during the LGP than during the late Holocene. Similar temperature changes derived from dissolved noble gases in other aquifer systems have been reported earlier for the south-western United States. The third water type was located down gradient of the first two in the confined Dakota in western and central Kansas. Groundwater residence time of this water mass is on the order of 104-105 yrs and its recharge location is near the Colorado and Kansas border down gradient of the other water types. The study shows the importance of using multiple tracers when investigating ground water systems.A suite of chemical and isotope tracers (dissolved noble gases, stable isotopes of water, radiocarbon, and CL) were analyzed along a flow path in the Dakota aquifer system to determine likely recharge sources, ground water residence times, and the extent of mixing between local and intermediate flow systems. Three water types were distinguished with the tracers, each having a very different history. Two of the water types were located in south-eastern Colorado where the Dakota is poorly confined. The third water type was located down gradient of the first two in the confined Dakota in western and central Kansas.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of Hydrology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","publisher":"Elsevier Sci B.V.","publisherLocation":"Amsterdam, Netherlands","doi":"10.1016/S0022-1694(98)00233-9","issn":"00221694","usgsCitation":"Clark, J., Davisson, M., Hudson, G., and Macfarlane, P.A., 1998, Noble gases, stable isotopes, and radiocarbon as tracers of flow in the Dakota aquifer, Colorado and Kansas: Journal of Hydrology, v. 211, no. 1-4, p. 151-167, https://doi.org/10.1016/S0022-1694(98)00233-9.","startPage":"151","endPage":"167","numberOfPages":"17","costCenters":[],"links":[{"id":487330,"rank":10000,"type":{"id":41,"text":"Open Access External Repository Page"},"url":"https://escholarship.org/uc/item/3wz4z3z0","text":"External Repository"},{"id":206840,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/S0022-1694(98)00233-9"},{"id":230913,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"211","issue":"1-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a6724e4b0c8380cd731d5","contributors":{"authors":[{"text":"Clark, J.F.","contributorId":24124,"corporation":false,"usgs":true,"family":"Clark","given":"J.F.","email":"","affiliations":[],"preferred":false,"id":386845,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Davisson, M.L.","contributorId":62277,"corporation":false,"usgs":true,"family":"Davisson","given":"M.L.","email":"","affiliations":[],"preferred":false,"id":386847,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Hudson, G.B.","contributorId":28768,"corporation":false,"usgs":true,"family":"Hudson","given":"G.B.","email":"","affiliations":[],"preferred":false,"id":386846,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Macfarlane, P. A.","contributorId":14597,"corporation":false,"usgs":true,"family":"Macfarlane","given":"P.","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":386844,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70020616,"text":"70020616 - 1998 - Hydrologic and water-chemistry data from the Cretaceous-aquifers test well (BFT-2055), Beaufort County, South Carolina","interactions":[],"lastModifiedDate":"2016-11-30T10:21:11","indexId":"70020616","displayToPublicDate":"1998-01-01T00:00:00","publicationYear":"1998","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3443,"text":"Southeastern Geology","active":true,"publicationSubtype":{"id":10}},"title":"Hydrologic and water-chemistry data from the Cretaceous-aquifers test well (BFT-2055), Beaufort County, South Carolina","docAbstract":"Test well BFT-2055 was drilled through the entire thickness of Coastal Plain sediments beneath central Hilton Head Island, South Carolina, and terminated in bedrock at a depth of 3833 feet. The well was drilled to evaluate the hydraulic properties of the Cretaceous formations beneath Hilton Head Island as a potential source of supplemental water to supplies currently withdrawn from the Upper Floridan aquifer. The intervals tested include sediments of the Cape Fear and Middendorf Formations. Results from aquifer tests indicate that the transmissivity of the formations screened ranges from 1300 to 3000 feet squared per day and an average hydraulic conductivity of about 15 feet per day. Formation-fluid pressure tests indicate that the potential exists for upward ground-water flow from higher fluid pressures in the deeper Cape Fear and Middendorf Formations to lower fluid pressures in the Black Creek Formation and shallower units. A flowmeter test indicated that greater than 75 percent of the natural, unpumped flow in the well is from the screened intervals no deeper than 3100 feet. Water-chemistry analyses indicate that the water sampled from the Middendorf and Cape Fear has about 1450 milligrams per liter dissolved solids, 310 to 1000 milligrams per liter sodium, and 144 to 1600 milligrams per liter chloride. Because these chloride concentrations would render water pumped from these aquifers as nonpotable, it is unlikely that these aquifers will be used as a supplemental source of water for island residents without some form of pretreatment. Similar chloride concentrations are present in some wells in the Upper Floridan aquifer adjacent to Port Royal Sound, and these chloride concentrations were the primary reason for drilling the test well in the Cretaceous formations as a possible source of more potable water.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Southeastern Geology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","issn":"00383678","usgsCitation":"Landmeyer, J., and Bradley, P., 1998, Hydrologic and water-chemistry data from the Cretaceous-aquifers test well (BFT-2055), Beaufort County, South Carolina: Southeastern Geology, v. 37, no. 3, p. 141-148.","startPage":"141","endPage":"148","numberOfPages":"8","costCenters":[{"id":13634,"text":"South Atlantic Water Science Center","active":true,"usgs":true}],"links":[{"id":231108,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"South Carolina","county":"Beaufort County","volume":"37","issue":"3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a355de4b0c8380cd5fe61","contributors":{"authors":[{"text":"Landmeyer, J. E.","contributorId":91140,"corporation":false,"usgs":true,"family":"Landmeyer","given":"J. E.","affiliations":[],"preferred":false,"id":386878,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Bradley, P. M. 0000-0001-7522-8606","orcid":"https://orcid.org/0000-0001-7522-8606","contributorId":29465,"corporation":false,"usgs":true,"family":"Bradley","given":"P. M.","affiliations":[],"preferred":false,"id":386877,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70020624,"text":"70020624 - 1998 - Size-selective predation on groundwater bacteria by nanoflagellates in an organic-contaminated aquifer","interactions":[],"lastModifiedDate":"2023-01-12T20:19:48.917401","indexId":"70020624","displayToPublicDate":"1998-01-01T00:00:00","publicationYear":"1998","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":850,"text":"Applied and Environmental Microbiology","active":true,"publicationSubtype":{"id":10}},"title":"Size-selective predation on groundwater bacteria by nanoflagellates in an organic-contaminated aquifer","docAbstract":"Time series incubations were conducted to provide estimates for the size selectivities and rates of protistan grazing that may be occurring in a sandy, contaminated aquifer. The experiments involved four size classes of fluorescently labeled groundwater bacteria (FLB) and 2- to 3-μm-long nanoflagellates, primarily Spumella guttula(Ehrenberg) Kent, that were isolated from contaminated aquifer sediments (Cape Cod, Mass.). The greatest uptake and clearance rates (0.77 bacteria · flagellate−1 · h−1 and 1.4 nl · flagellate−1 · h−1, respectively) were observed for 0.8- to 1.5-μm-long FLB (0.21-μm3 average cell volume), which represent the fastest growing bacteria within the pore fluids of the contaminated aquifer sediments. The 19:1 to 67:1 volume ratios of nanoflagellate predators to preferred bacterial prey were in the lower end of the range commonly reported for other aquatic habitats. The grazing data suggest that the aquifer nanoflagellates can consume as much as 12 to 74% of the unattached bacterial community in 1 day and are likely to have a substantive effect upon bacterial degradation of organic groundwater contaminants.
The first phase of intensive data collection for the National Water-Quality Assessment (NAWQA) was completed during 1993−1995 in 20 major hydrologic basins of the United States. Groundwater land-use studies, designed to sample recently recharged groundwater (generally within 10 years) beneath specific land-use and hydrogeologic settings, are a major component of the groundwater quality as sessment for NAWQA. Pesticide results from the 41 land-use studies conducted during 1993−1995 indicate that pesticides were commonly detected in shallow groundwater, having been found at 54.4% of the 1034 sites sampled in agricultural and urban settings across the United States. Pesticide concentrations were generally low, with over 95% of the detections at concentrations less than 1 μg/L. Of the 46 pesticide compounds examined, 39 were detected. The compounds detected most frequently were atrazine (38.2%), deethylatrazine (34.2%), simazine (18.0%), metolachlor (14.6%), and prometon (13.9%). Statistically significant relations were observed between frequencies of detection and the use, mobility, and persistence of these compounds. Pesticides were commonly detected in both agricultural (56.4%; 813 sites) and urban (46.6%; 221 sites) settings. Frequent detections of pesticides in urban areas indicate that, as is the case with agricultural pesticide use in agricultural areas, urban and suburban pesticide use significantly contribute to pesticide occurrence in shallow groundwater. Although pesticides were detected in groundwater sampled in urban areas and all nine of the agricultural land-use categories examined, significant variations in occurrence were observed among these categories. Maximum contaminant levels (MCLs) established by the U.S. Environmental Protection Agency for drinking water were exceeded for only one pesticide (atrazine, 3 μg/L) at a single location. However, MCLs have been established for only 25 of the 46 pesticide compounds examined, do not cover pesticide degradates, and, at present, do not take into account additive or synergistic effects of combinations of pesticide compounds or potential effects on nearby aquatic ecosystems.
","language":"English","publisher":"American Chemical Society","publisherLocation":"Washington, DC","doi":"10.1021/es970412g","issn":"0013936X","usgsCitation":"Kolpin, D.W., Barbash, J.E., and Gilliom, R.J., 1998, Occurrence of pesticides in shallow groundwater of the United States: initial results from the National Water-Quality Assessment program: Environmental Science & Technology, v. 32, no. 5, p. 558-566, https://doi.org/10.1021/es970412g.","productDescription":"9 p.","startPage":"558","endPage":"566","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":351,"text":"Iowa Water Science Center","active":true,"usgs":true},{"id":622,"text":"Washington Water Science Center","active":true,"usgs":true}],"links":[{"id":230994,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":206860,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1021/es970412g"}],"country":"United 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