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Filter Total Items: 2,184
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Year Published: 2017

Importance of measuring discharge and sediment transport in lesser tributaries when closing sediment budgets

Sediment budgets are an important tool for understanding how riverine ecosystems respond to perturbations. Changes in the quantity and grain size distribution of sediment within river systems affect the channel morphology and related habitat resources. It is therefore important for resource managers to know if a river reach is in a state of...

Griffiths, Ronald; Topping, David
Griffiths, R.E., and Topping, D.J., 2017, Importance of measuring discharge and sediment transport in lesser tributaries when closing sediment budgets: Geomorphology, v. 296, p. 59-73, https://doi.org/10.1016/j.geomorph.2017.08.037.

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Year Published: 2017

Mammalian mesocarnivore visitation at tortoise burrows in a wind farm

There is little information on predator–prey interactions in wind energy landscapes in North America, especially among terrestrial vertebrates. Here, we evaluated how proximity to roads and wind turbines affect mesocarnivore visitation with desert tortoises (Gopherus agassizii) and their burrows in a wind energy landscape. In 2013, we placed...

Agha, Mickey; Smith, Amanda L.; Lovich, Jeffrey E.; Delaney, David F.; Ennen, Joshua R.; Briggs, Jessica R.; Fleckenstein, Leo J.; Tennant, Laura A.; Puffer, Shellie R.; Walde, Andrew D.; Arundel, Terence R.; Price, Steven J.; Todd, Brian D.
Agha, M., Smith, A.L., Lovich, J.E., Delaney, D., Ennen, J.R., Briggs, J., Fleckenstein, L.J., Tennant, L.A., Puffer, S.R., Walde, A., Arundel, T., Price, S.J., and Todd, B.D., 2017, Mammalian mesocarnivore visitation at tortoise burrows in a wind farm: Journal of Wildlife Management, v. (online), http://dx.doi.org/10.1002/jwmg.21262.

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Year Published: 2017

Climate, wildfire, and erosion ensemble foretells more sediment in western USA watersheds

The area burned annually by wildfires is expected to increase worldwide due to climate change. Burned areas increase soil erosion rates within watersheds, which can increase sedimentation in downstream rivers and reservoirs. However, which watersheds will be impacted by future wildfires is largely unknown. Using an ensemble of climate, fire, and...

Sankey, Joel B.; Kreitler, Jason R.; Hawbaker, Todd; McVay, Jason L.; Miller, Mary Ellen; Mueller, Erich R.; Vaillant, Nicole M.; Lowe, Scott E.; Sankey, Temuulen T.
Sankey, J.B., Kreitler, J., Hawbaker, T.J., McVay, J.L., Miller, M.E., Mueller, E.R., Vaillant, N.M., Lowe, S.E., and Sankey, T.T., 2017, Climate, wildfire, and erosion ensemble foretells more sediment in western USA watersheds: Geophysical Research Letters, v. (online), http://dx.doi.org/10.1002/2017GL073979.

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Year Published: 2017

The Mars Science Laboratory Curiosity rover Mastcam instruments: Preflight and in-flight calibration, validation, and data archiving

The NASA Curiosity rover Mast Camera (Mastcam) system is a pair of fixed-focal length, multispectral, color CCD imagers mounted ~2 m above the surface on the rover's remote sensing mast, along with associated electronics and an onboard calibration target. The left Mastcam (M-34) has a 34 mm focal length, an instantaneous field of view (...

Bell, James F. ; Godber, A.; McNair, S.; Caplinger, M.A.; Maki, J.N.; Lemmon, M.T.; Van Beek, J.; Malin, M.C.; Wellington, D.; Kinch, K.M.; Madsen, M.B.; Hardgrove, C.; Ravine, M.A.; Jensen, E.; Harker, D.; Anderson, Ryan; Herkenhoff, Kenneth E.; Morris, R.V.; Cisneros, E.; Deen, R.G.

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Year Published: 2017

Viscous relaxation of Ganymede's impact craters: Constraints on heat flux

Measurement of crater depths in Ganymede’s dark terrain have revealed substantial numbers of unusually shallow craters indicative of viscous relaxation [see companion paper: Singer, K.N., Schenk, P. M., Bland, M.T., McKinnon, W.B., (2017). Relaxed impact craters on Ganymede: Regional variations and high heat flow. Icarus, submitted]. These...

Bland, Michael T.; Singer, Kelsi N.; McKinnon, William B.; Schenk, Paul M.
Bland, M. T. and McKinnon, W. B. Viscous relaxation of Ganymede's impact craters: Constraints on heat flux. Icarus 296, 275-288.

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Year Published: 2017

In situ detection of boron by ChemCam on Mars

We report the first in situ detection of boron on Mars. Boron has been detected in Gale crater at levels <0.05 wt % B by the NASA Curiosity rover ChemCam instrument in calcium‐sulfate‐filled fractures, which formed in a late‐stage groundwater circulating mainly in phyllosilicate‐rich bedrock interpreted as lacustrine in origin. We...

Gasda, Patrick J.; Haldeman, Ethan B.; Wiens, Roger C.; Rapin, William; Bristow, Thomas F.; Bridges, John C.; Schwenzer, Susanne P.; Clark, Benton C.; Herkenhoff, Kenneth E.; Frydenvang, Jens; Lanza, Nina L.; Maurice, Sylvestre; Clegg, Samuel M.; Delapp, Dorothea M.; Sanford, Veronica L.; Bodine, Madeleine R.; McInroy, Rhonda
Gasda, P. J., E. B. Haldeman, R. C. Wiens, W. Rapin, T. F. Bristow, J. C. Bridges, S. P. Schwenzer, B. Clark, K. Herkenhoff, J. Frydenvang, N. L. Lanza, S. Maurice, S. Clegg, D. M. Delapp, V. L. Sanford, M. R. Bodine, and R. McInroy (2017), In situ detection of boron by ChemCam on Mars, Geophys. Res. Lett., doi: 10.1002/2017GL074480.

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Year Published: 2017

Survival of the endangered Pima pineapple cactus: Does clearing before prescribed fire alter survival postfire?

Federal land managers and ranchers often use prescribed fire as a tool to reduce invading woody plants within desert grasslands of the arid southwestern United States. Managers must evaluate the threat of the burn toward the health and survival of plants of concern including how preemptive clearing before prescribed fire might benefit these...

Thomas, Kathryn A.; Jarchow, Christopher; Crawford, Julie A.
Thomas, K.A., Jarchow, C.J., and Crawford, J.A., 2017, Survival of the endangered pima pineapple cactus—Does clearing before prescribed fire alter survival postfire?: The Southwestern Naturalist, v. 62, no. 3, p. 200-206, https://doi.org/10.1894/0038-4909-62.3.200.

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Year Published: 2017

The planetary data system

In the early 1980s, the Space Science Board (SSB) of the National Research Council was concerned about the poor and inconsistent treatment of scientific information returned from NASA’s space science missions. The SSB formed a panel [The Committee on Data Management and Computation (CODMAC)] to assess the situation and make recommendations to NASA...

Acton, Charles; Slavney, Susan; Arvidson, Raymond E.; Gaddis, Lisa R.; Gordon, Mitchell; Lavoie, Susan
Acton, C., Slavney, S., Arvidson, R., Gaddis, L., Gordon, M. and Lavoie, Susan, 2017, The Planetary Data System, Lunar and Planetary Information Bulletin, Issue 150, Sept. 2017, pp. 2-12.

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Year Published: 2017

Effects of environmental covariates and density on the catchability of fish populations and interpretation of catch per unit effort trends

Article for outlet: Fisheries Research. Abstract: Quantifying temporal and spatial trends in abundance or relative abundance is required to evaluate effects of harvest and changes in habitat for exploited and endangered fish populations. In many cases, the proportion of the population or stock that is captured (catchability or capture probability...

Korman, Josh; Yard, Mike
Korman, J., and Yard, M., 2017, Effects of environmental covariates and density on the catchability of fish populations and interpretation of catch per unit effort trends: Fisheries Research, v. 189, p. 18-34, http://dx.doi.org/10.1016/j.fishres.2017.01.005.

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Year Published: 2017

Modern landscape processes affecting archaeological sites along the Colorado River corridor downstream of Glen Canyon Dam, Glen Canyon National Recreation Area, Arizona

The landscape of the Colorado River through Glen Canyon National Recreation Area formed over many thousands of years and was modified substantially after the completion of Glen Canyon Dam in 1963. Changes to river flow, sediment supply, channel base level, lateral extent of sedimentary terraces, and vegetation in the post-dam era have modified the...

East, Amy E.; Sankey, Joel B.; Fairley, Helen C.; Caster, Joshua J.; Kasprak, Alan
East, A.E., Sankey, J.B., Fairley, H.C., Caster, J.J., and Kasprak, A., 2017, Modern landscape processes affecting archaeological sites along the Colorado River corridor downstream of Glen Canyon Dam, Glen Canyon National Recreation Area, Arizona: U.S. Geological Survey Scientific Investigations Report 2017–5082, 22 p., https://doi.org/10.3133/sir20175082.

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Year Published: 2017

Enhancing wind erosion monitoring and assessment for U.S. rangelands

On the GroundWind erosion is a major resource concern for rangeland managers because it can impact soil health, ecosystem structure and function, hydrologic processes, agricultural production, and air quality.Despite its significance, little is known about which landscapes are eroding, by how much, and when.The National Wind Erosion Research...

Webb, Nicholas P.; Van Zee, Justin W.; Karl, Jason W.; Herrick, Jeffrey E.; Courtright, Ericha M.; Billings, Benjamin J.; Boyd, Robert C.; Chappell, Adrian; Duniway, Michael C.; Derner, Justin D.; Hand, Jenny L.; Kachergis, Emily; McCord, Sarah E.; Newingham, Beth A.; Pierson, Frederick B.; Steiner, Jean L.; Tatarko, John; Tedela, Negussie H.; Toledo, David; Van Pelt, R. Scott
Webb, N.P., Van Zee, J.W., Karl, J.W., Herrik, J.W., Courtright, E.M., Billings, B.J., Boyd, R., Chappel, A., Duniway, M.C., Derner, J.D., Hand, J.L., Kachergis, E., McCord, S.E., Newingham, B.A., Pierson, F.B., Steiner, J.L., Tatarko, J., Tedela, N.H., Toledo, D., and Van Pelt, R.S., 2017, in press, v. (online), Enhancing Wind Erosion Monitoring and Assessment for U.S. Rangelands: Rangelands, https://doi.org/10.1016/j.rala.2017.04.001.

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Year Published: 2017

Spectrally monitoring the response of the biocrust moss Syntrichia caninervis to altered precipitation regimes

Climate change is expected to impact drylands worldwide by increasing temperatures and changing precipitation patterns. These effects have known feedbacks to the functional roles of dryland biological soil crust communities (biocrusts), which are expected to undergo significant climate-induced changes in community structure and function....

Young, Kristina E.; Reed, Sasha C.
Young, K.E., and Reed, S.C., 2017, Spectrally monitoring the response of the biocrust moss Syntrichia caninervis to altered precipitation regimes: Scientific Reports, v. 7, http://doi.org/10.1038/srep41793.

Filter Total Items: 239
Image: White Pelicans
March 6, 2008

White Pelicans

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: White Pelicans
March 6, 2008

White Pelicans

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: White Pelicans
March 6, 2008

White Pelicans

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Ancient Lake Cahuilla High Water Mark
January 24, 2008

Ancient Lake Cahuilla High Water Mark

Lake Cahuilla was an ancient freshwater lake in the Salton Trough of southern California. It covered parts of the Coachella, Imperial and Mexicali valleys and was formed when the Colorado River overflowed its banks or was diverted northwest by its own sediments, which temporarily blocked the flow to the Gulf of California (Sea of Cortez). Although there have been a few

...
Attribution: Southwest
Photograph of Natural Bridges State Beach, Santa Cruz, CA
January 21, 2008

Natural Bridges State Beach, Santa Cruz, California

Photograph of the coastal region of Natural Bridges State Beach in Santa Cruz, California

Image: White Pelicans
December 13, 2007

White Pelicans

Birds found in and around the Salton Sea, California.

Attribution: Southwest
USGS scientists navigate personal water craft around San Francisco Bay, collecting bathymetric data.
October 26, 2007

Collecting Bathymetric Data in San Francisco Bay

USGS scientists Patrick Barnard (left) and Jeff Hansen navigate personal watercraft equipped with GPS and echo sounders through the waters of San Francisco Bay. They are collecting bathymetric, or depth, information in order to create maps of the bottom of the Bay. The maps will be used to determine how the morphology or shape of the Bay floor changes through time.

Image: Dowitcher
August 23, 2007

Dowitcher

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Great Egret Fishing
July 31, 2007

Great Egret Fishing

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Roseate Spoonbill
July 27, 2007

Roseate Spoonbill

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Wood Stork with Fish
July 27, 2007

Wood Stork with Fish

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Wood Storks
July 24, 2007

Wood Storks

Birds found in and around the Salton Sea, California.

Attribution: Southwest

Nine USGS Science Centers are administered by the Pacific Regional office, which is headquartered in Sacramento, California.