Geology, geochronology, and paleogeography of the southern Sonoma volcanic field and adjacent areas, northern San Francisco Bay region, California
David L. Wagner, George J. Saucedo, Kevin B. Clahan, Robert J. Fleck, Victoria E. Langenheim, Robert J. McLaughlin, Andrei M. Sarna-Wojcicki, James R. Allen, Alan L. Deino
2011, Geosphere (7) 658-683
Recent geologic mapping in the northern San Francisco Bay region (California, USA) supported by radiometric dating and tephrochronologic correlations, provides insights into the framework geology, stratigraphy, tectonic evolution, and geologic history of this part of the San Andreas transform plate boundary. There are 25 new and existing radiometric dates that...
Molecular detection of vertebrates in stream water: A demonstration using rocky mountain tailed frogs and Idaho giant salamanders
C.S. Goldberg, D. S. Pilliod, R.S. Arkle, L.P. Waits
2011, PLoS ONE (6)
Stream ecosystems harbor many secretive and imperiled species, and studies of vertebrates in these systems face the challenges of relatively low detection rates and high costs. Environmental DNA (eDNA) has recently been confirmed as a sensitive and efficient tool for documenting aquatic vertebrates in wetlands and in a large river...
A first look at the petroleum geology of the Lomonosov Ridge microcontinent, Arctic Ocean
Thomas E. Moore, Arthur Grantz, Janet K. Pitman, Philip J. Brown
2011, Geological Society Memoir (35) 751-769
The Lomonosov microcontinent is an elongated continental fragment that transects the Arctic Ocean between North America and Siberia via the North Pole. Although it lies beneath polar pack ice, the geological framework of the microcontinent is inferred from sparse seismic reflection data, a few cores, potential field data and the...
Canine detection of free-ranging brown treesnakes on Guam
Julie A. Savidge, James W. Stanford, Robert Reed, Ginger R. Haddock, Amy A. Yackel Adams
2011, New Zealand Journal of Ecology (35) 174-181
We investigated canine teams (dogs and their handlers) on Guam as a potential tool for finding invasive brown treesnakes (Boiga irregularis) in the wild. Canine teams searched a 40 × 40 m forested area for a snake that had consumed a dead mouse containing a radio-transmitter. To avoid tainting the...
National intergrated drought information system
R. Pulwarty, J. Verdin, L. Darby, C. McNutt, R. Webb
2011, Conference Paper, 2011 GEOSS Workshop XL - Managing Drought through Earth Observation, GEOSS 2011
[No abstract available]...
Nitrogen uptake by the shoots of smooth cordgrass Spartina alterniflora
T. J. Mozdzer, M. Kirwan, K. J. McGlathery, J. C. Zieman
2011, Marine Ecology Progress Series (433) 43-52
The smooth cordgrass Spartina alterniflora is the foundation species in intertidal salt marshes of the North American Atlantic coast. Depending on its elevation within the marsh, S. alterniflora may be submerged for several hours per day. Previous ecosystem-level studies have demonstrated that S. alterniflora marshes are a net sink for nitrogen (N), and that removal of...
Rain pulse response of soil CO2 exchange by biological soil crusts and grasslands of the semiarid Colorado Plateau, United States
David R. Bowling, Edmund E. Grote, Jayne Belnap
2011, Journal of Geophysical Research G: Biogeosciences (116)
Biological activity in arid grasslands is strongly dependent on moisture. We examined gas exchange of biological soil crusts (biocrusts), the underlying soil biotic community, and the belowground respiratory activity of C3 and C4 grasses over 2 years in southeast Utah, USA. We used soil surface CO2 flux and the amount...
Long-term biases in geomagnetic K and aa indices
Jeffrey J. Love
2011, Annales Geophysicae (29) 1365-1375
Analysis is made of the geomagnetic-activity aa index and its source K-index data from groups of ground-based observatories in Britain, and Australia, 1868.0–2009.0, solar cycles 11–23. The K data show persistent biases, especially for high (low) K-activity levels at British (Australian) observatories. From examination of multiple subsets of the K data we infer that the biases are not...
The indication of Martian gully formation processes by slope-area analysis
Susan J. Conway, Matthew R. Balme, John B. Murray, Martin C. Towner, Chris Okubo, Peter M. Grindrod
2011, Geological Society Special Publication (356) 171-201
The formation process of recent gullies on Mars is currently under debate. This study aims to discriminate between the proposed formation processes - pure water flow, debris flow and dry mass wasting - through the application of geomorphological indices commonly used in terrestrial geomorphology. High-resolution digital elevation models (DEMs) of...
Group on Earth Observations (GEO) global drought early warning information service
W. Pozzi, D. Cripe, J. Vogt, M. Werner, R. Heim, M.J. Brewer, J. Sheffield, R. Westerhoff, R. Stefanski, M. Svoboda, J. Verdin
2011, Conference Paper, 2011 GEOSS Workshop XL - Managing Drought through Earth Observation, GEOSS 2011
[No abstract available]...
A bacterium that can grow by using arsenic instead of phosphorus
Felisa Wolfe-Simon, Jodi S. Blum, T.R. Kulp, Gordon W. Rattray, S.E. Hoeft, J. Pett-Ridge, J.F. Stolz, S.M. Webb, P.K. Weber, P.C.W. Davies, A.D. Anbar, R.S. Oremland
2011, Science (332) 1163-1166
Life is mostly composed of the elements carbon, hydrogen, nitrogen, oxygen, sulfur, and phosphorus. Although these six elements make up nucleic acids, proteins, and lipids and thus the bulk of living matter, it is theoretically possible that some other elements in the periodic table could serve the same functions. Here,...
Mapping rice areas of South Asia using MODIS multitemporal data
M.K. Gumma, A. Nelson, P.S. Thenkabail, A.N. Singh
2011, Journal of Applied Remote Sensing (5)
Our goal is to map the rice areas of six South Asian countries using moderate-resolution imaging spectroradiometer (MODIS) time-series data for the time period 2000 to 2001. South Asia accounts for almost 40% of the world's harvested rice area and is also home to 74% of the population that lives...
A bayesian approach for determining velocity and uncertainty estimates from seismic cone penetrometer testing or vertical seismic profiling data
Adam Pidlisecky, Seth S. Haines
2011, Canadian Geotechnical Journal (48) 1061-1069
Conventional processing methods for seismic cone penetrometer data present several shortcomings, most notably the absence of a robust velocity model uncertainty estimate. We propose a new seismic cone penetrometer testing (SCPT) data-processing approach that employs Bayesian methods to map measured data errors into quantitative estimates of model uncertainty. We first...
Aeolian nutrient fluxes following wildfire in sagebrush steppe: Implications for soil carbon storage
N.J. Hasselquist, M.J. Germino, Joel B. Sankey, L.J. Ingram, N.F. Glenn
2011, Biogeosciences Discussions (8) 8323-8349
. Pulses of aeolian transport following fire can profoundly affect the biogeochemical cycling of nutrients in semi-arid and arid ecosystems. Our objective was to determine horizontal nutrient fluxes occurring in the saltation zone during an episodic pulse of aeolian transport that occurred following a wildfire in a semi-arid sagebrush steppe...
Wave climate and trends along the eastern Chukchi Arctic Alaska coast
L. H. Erikson, C. D. Storlazzi, R. E. Jensen
2011, Conference Paper, Solutions to Coastal Disasters 2011 - Proceedings of the 2011 Solutions to Coastal Disasters Conference
Due in large part to the difficulty of obtaining measurements in the Arctic, little is known about the wave climate along the coast of Arctic Alaska. In this study, numerical model simulations encompassing 40 years of wave hind-casts were used to assess mean and extreme wave conditions. Results indicate that...
Globally Gridded Satellite observations for climate studies
K.R. Knapp, S. Ansari, C.L. Bain, M.A. Bourassa, M.J. Dickinson, Chris Funk, C.N. Helms, C.C. Hennon, C.D. Holmes, G. J. Huffman, J.P. Kossin, H.-T. Lee, A. Loew, G. Magnusdottir
2011, Bulletin of the American Meteorological Society (92) 893-907
Geostationary satellites have provided routine, high temporal resolution Earth observations since the 1970s. Despite the long period of record, use of these data in climate studies has been limited for numerous reasons, among them that no central archive of geostationary data for all international satellites exists, full temporal and spatial...
Geology and petroleum potential of the north and east margins of the Siberian Craton, north of the Arctic Circle
T. R. Klett, C. J. Wandrey, Janet K. Pitman
2011, Geological Society Memoir 413-431
The Siberian Craton consists of crystalline rocks and superimposed Precambrian sedimentary rocks deposited in rift basins. Palaeozoic rocks, mainly carbonates, were deposited along the margins of the craton to form an outwardly younger concentric pattern that underlies an outward-thickening Mesozoic sedimentary section. The north and east margins of the Siberian...
The academic road less traveled
D.A. James
2011, Fisheries (36) 351-352
[No abstract available]...
Adaptive finite volume methods with well-balanced Riemann solvers for modeling floods in rugged terrain: Application to the Malpasset dam-break flood (France, 1959)
D.L. George
2011, International Journal for Numerical Methods in Fluids (66) 1000-1018
The simulation of advancing flood waves over rugged topography, by solving the shallow-water equations with well-balanced high-resolution finite volume methods and block-structured dynamic adaptive mesh refinement (AMR), is described and validated in this paper. The efficiency of block-structured AMR makes large-scale problems tractable, and allows the use of accurate and...
Tiny intraplate earthquakes triggered by nearby episodic tremor and slip in Cascadia
J.E. Vidale, A.J. Hotovec, A. Ghosh, K. C. Creager, J. Gomberg
2011, Geochemistry, Geophysics, Geosystems (12)
Episodic tremor and slip (ETS) has been observed in many subduction zones, but its mechanical underpinnings as well as its potential for triggering damaging earthquakes have proven difficult to assess. Here we use a seismic array in Cascadia of unprecedented density to monitor seismicity around a moderate 16 day ETS...
Characterizing land surface change and levee stability in the Sacramento-San Joaquin Delta using UAVSAR radar imagery
C. Jones, G. Bawden, S. Deverel, J. Dudas, S. Hensley
2011, Conference Paper, International Geoscience and Remote Sensing Symposium (IGARSS)
The islands of the Sacramento-San Joaquin Delta have been subject to subsidence since they were first reclaimed from the estuary marshlands starting over 100 years ago, with most of the land currently lying below mean sea level. This area, which is the primary water resource of the state of California,...
Sea otter mortality in fish and shellfish traps: Estimating potential impacts and exploring possible solutions
Brian B. Hatfield, J.A. Ames, J. A. Estes, M. Timothy Tinker, A.B. Johnson, M. M. Staedler, M.D. Harris
2011, Endangered Species Research (13) 219-229
Sea otters Enhydra lutris can be bycaught and drowned in fishing pots and traps, which may pose a threat to the welfare of otter populations. We explored this potential problem and its solutions using a wide variety of analyses. We exposed live California (USA) sea otters to finfish traps, lobster traps, and...
Common challenges for ecological modelling: synthesis of facilitated discussions held at the symposia organized for the 2009 conference of the International Society for Ecological Modelling in Quebec City, Canada, (October 6-9, 2009)
Guy R. Larocque, D. Mailly, T.-X. Yue, M. Anand, C. Peng, C. Kazanci, M. Etterson, P. Goethals, S.E. Jorgensen, J.R. Schramski, E.J.B. McIntire, D.J. Marceau, B. Chen, G.Q. Chen, Z.F. Yang, B. Novotna, N. Luckai, Jagtar S. Bhatti, J. Liu, A. Munson, Andrew M. Gordon, J.C. Ascough
2011, Ecological Modelling (222) 2456-2468
The eleven symposia organized for the 2009 conference of the International Society for Ecological Modelling (ISEM 2009) held in Quebec City, Canada, October 6–9, 2009, included facilitated discussion sessions following formal presentations. Each symposium focused on a specific subject, and all the subjects could be classified into three broad categories:...
Unravelling long-term vegetation change patterns in a binational watershed using multitemporal land cover data and historical photography
M.L. Villarreal, Laura M. Norman, Robert Webb, Diane E. Boyer, R.E. Turner
2011, Conference Paper, 2011 6th International Workshop on the Analysis of Multi-Temporal Remote Sensing Images, Multi-Temp 2011 - Proceedings
A significant amount of research conducted in the Sonoran Desert of North America has documented, both anecdotally and empirically, major vegetation changes over the past century due to human land use activities. However, many studies lack coincidental landscape-scale data characterizing the spatial and temporal manifestation of these changes. Vegetation changes...
Modeling the spatial-temporal dynamics of net primary production in Yangtze River Basin using IBIS model
Z. Zhang, H. Jiang, J. Liu, Q. Zhu, X. Wei, Z. Jiang, G. Zhou, X. Zhang, J. Han
2011, Conference Paper, Proceedings - 2011 19th international conference on geoinformatics, Geoinformatics 2011
The climate change has significantly affected the carbon cycling in Yangtze River Basin. To better understand the alternation pattern for the relationship between carbon cycling and climate change, the net primary production (NPP) were simulated in the study area from 1956 to 2006 by using the Integrated Biosphere Simulator (IBIS)....
