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Filter Total Items: 2,153
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Year Published: 2017

The Colour and Stereo Surface Imaging System (CaSSIS) for the ExoMars Trace Gas Orbiter

The Colour and Stereo Surface Imaging System (CaSSIS) is the main imaging system onboard the European Space Agency’s ExoMars Trace Gas Orbiter (TGO) which was launched on 14 March 2016. CaSSIS is intended to acquire moderately high resolution (4.6 m/pixel) targeted images of Mars at a rate of 10–20 images per day from a roughly circular orbit 400...

Thomas, N.; Cremonese, G.; Ziethe, R.; Gerber, M.; Brändli, M.; Bruno, G.; Erismann, M.; Gambicorti, L.; Gerber, T.; Ghose, K.; Gruber, M.; Gubler, P.; Mischler, H.; Jost, J.; Piazza, D.; Pommerol, A.; Rieder, M.; Roloff, V.; Servonet, A.; Trottmann, W.; Uthaicharoenpong, T.; Zimmermann, C.; Vernani, D.; Johnson, M.; Pelò, E.; Weigel, T.; Viertl, J.; De Roux, N.; Lochmatter, P.; Sutter, G.; Casciello, A.; Hausner, T.; Ficai Veltroni, I.; Da Deppo, V.; Orleanski, P.; Nowosielski, W.; Zawistowski, T.; Szalai, S.; Sodor, B.; Tulyakov, S.; Troznai, G.; Banaskiewicz, M.; Bridges, J.C.; Byrne, S.; Debei, S.; El-Maarry, M. R.; Hauber, E.; Hansen, C.J.; Ivanov, A.; Keszthelyil, L.; Kirk, Randolph L.; Kuzmin, R.; Mangold, N.; Marinangeli, L.; Markiewicz, W. J.; Massironi, M.; McEwen, A.S.; Okubo, Chris H.; Tornabene, L.L.; Wajer, P.; Wray, J.J.
Thomas, N., Cremonese, G., Ziethe, R., Gerber, M., Brändli, M., Bruno, G., … Wray, J. J. (2017). The Colour and Stereo Surface Imaging System (CaSSIS) for the ExoMars Trace Gas Orbiter. Space Science Reviews, 212(3–4), 1897–1944. https://doi.org/10.1007/s11214-017-0421-1

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Year Published: 2017

Future soil moisture and temperature extremes imply expanding suitability for rainfed agriculture in temperate drylands

The distribution of rainfed agriculture is expected to respond to climate change and human population growth. However, conditions that support rainfed agriculture are driven by interactions among climate, including climate extremes, and soil moisture availability that have not been well defined. In the temperate regions that support much of the...

Bradford, John B.; Schlaepfer, Daniel R.; Lauenroth, William K.; Yackulic, Charles B.; Duniway, Michael C.; Hall, Sonia A.; Jia, Gensuo; Jamiyansharav, Khishigbayar; Munson, Seth M.; Wilson, Scott D.; Tietjen, Britta
Bradford, J.B., Schlaepfer, D.R., Lauenroth, W.K., Yackulic, C.B., Duniway, M., Hall, S., Jia, G., Jamiyansharav, K., Munson, S.M., Wilson, S.D., and Tietjen, B., 2017, Future soil moisture and temperature extremes imply expanding suitability for rainfed agriculture in temperate drylands: Scientific Reports, v. (online), http://dx.doi.org/10.1038/s41598-017-13165-x.

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Year Published: 2017

Monitoring gas and heat emissions at Norris Geyser Basin, Yellowstone National Park, USA based on a combined eddy covariance and Multi-GAS approach

We quantified gas and heat emissions in an acid-sulfate, vapor-dominated area (0.04-km2) of Norris Geyser Basin, located just north of the 0.63 Ma Yellowstone Caldera and near an area of anomalous uplift. From 14 May to 3 October 2016, an eddy covariance system measured half-hourly CO2, H2O and sensible (H) and latent (LE) heat fluxes and a...

Lewicki, Jennifer L.; Kelly, Peter J.; Bergfeld, Deborah; Vaughan, R. Greg; Lowenstern, Jacob B.
Lewicki, J.L., P.J. Kelly, D. Bergfeld, R.G. Vaughan, J.B. Lowenstern. Monitoring gas and heat emissions at Norris Geyser Basin, Yellowstone National Park, USA based on a combined eddy covariance and Multi-GAS approach. Journal of Volcanology and Geothermal Research, 347, 312-326, https://doi.org/10.1016/j.jvolgeores.2017.10.001, 2017.

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Year Published: 2017

Variation in annual clutch phenology of desert tortoises (Gopherus morafkai) in the Sonoran Desert of Arizona

The phenology of egg production and oviposition in organisms affects survival and development of neonates and thus, both offspring and maternal fitness. In addition, in organisms with environmental sex determination, clutch phenology can affect hatchling sex ratios with attendant effects on population demography. The rapid rate of contemporary...

Lovich, Jeffrey E.; Averill-Murray, Roy C.; Agha, Mickey; Ennen, Joshua R.; Austin, Meaghan
Lovich, J.E., Averill-Murray, R.C., Agha, M., Ennen, J.R., and Austin, M., 2017, in press, Variation in Annual Clutch Phenology of Sonoran Desert Tortoises (Gopherus morafkai) in Central Arizona: Herpetologica, v. (online), http://dx.doi.org/10.1655/HERPETOLOGICA-D-17-00007.1.

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Year Published: 2017

Biocrust ecology: Unifying micro- and macro-scales to confront global change

Biological soil crusts (biocrusts) are communities of microbes, lichens and bryophytes living at the soil surface in drylands (Fig. 1; Belnap et al., 2016). Biocrusts occur on all continents and can comprise a majority of cover in some systems (Belnap et al., 2016). While species diversity and distributions have long been a research focus,...

Ferrenberg, Scott; Reed, Sasha C.
Ferrenberg, S., and Reed, S.C., 2017, Biocrust ecology: unifying micro- and macro-scales to confront global change: New Phytologist, v. 216, no. 3, p. 643-646, http://dx.doi.org/10.1111/nph.14826.

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Year Published: 2017

Origin of discrepancies between crater size-frequency distributions of coeval lunar geologic units via target property contrasts

Recent work on dating Copernican-aged craters, using Lunar Reconnaissance Orbiter (LRO) Camera data, re-encountered a curious discrepancy in crater size-frequency distribution (CSFD) measurements that was observed, but not understood, during the Apollo era. For example, at Tycho, Copernicus, and Aristarchus craters, CSFDs of impact melt deposits...

Van der Bogert, Carolyn H.; Hiesinger, Harald; Dundas, Colin M.; Kruger, T.; McEwen, Alfred S.; Zanetti, Michael; Robinson, Mark S.
Van der Bogert, C. H., Hiesinger, H., Dundas, C. M., Kruger, T., Zanetti, M., McEwen, A. S., Robinson, M. S., 2017. Origins of discrepancies between crater size-frequency distributions of coeval lunar geologic units. Icarus, 298, 49-63, doi:10.1016/j.icarus.2016.11.040.

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Year Published: 2017

A coupled metabolic-hydraulic model and calibration scheme for estimating of whole-river metabolism during dynamic flow conditions

Conventional methods for estimating whole-stream metabolic rates from measured dissolved oxygen dynamics do not account for the variation in solute transport times created by dynamic flow conditions. Changes in flow at hourly time scales are common downstream of hydroelectric dams (i.e. hydropeaking), and hydrologic limitations of conventional...

Payn, Robert A.; Hall, Robert O Jr.; Kennedy, Theodore A.; Poole, Geoff C; Marshall, Lucy A.
Payn, R.A., Hall Jr., R.O., Kennedy, T.A., Poole, G.C., and Marshall, L.A., 2017, A coupled metabolic-hydraulic model and calibration scheme for estimating of whole-river metabolism during dynamic flow conditions: Limnology and Oceanography: Methods, v. (online), http://dx.doi.org/10.1002/lom3.10204.

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Year Published: 2017

Building capacity in biodiversity monitoring at the global scale

Human-driven global change is causing ongoing declines in biodiversity worldwide. In order to address these declines, decision-makers need accurate assessments of the status of and pressures on biodiversity. However, these are heavily constrained by incomplete and uneven spatial, temporal and taxonomic coverage. For instance, data from regions...

Schmeller, Dirk S.; Bohm, Monika; Arvanitidis, Christos; Barber-Meyer, Shannon; Brummitt, Neil; Chandler, Mark; Chatzinikolaou, Eva; Costello, Mark John; Ding, Hui; García-Moreno, Jaime; Gill, Michael J.; Haase, Peter; Jones, Miranda; Juillard, Romain; Magnusson, William E.; Martin, Corinne S.; McGeoch, Melodie A.; Mihoub, Jean-Baptiste; Pettorelli, Nathalie; Proença, Vânia; Peng, Cui; Regan, Eugenie; Schmiedel, Ute; Simsika, John P.; Weatherdon, Lauren; Waterman, Carly; Xu, Haigen; Belnap, Jayne
Schmeller, D.S., Böhm, M., Arvanitidis, C., Barber-Meyer, S., Brummitt, N., Chandler, M., Chatzinikolaou, E., Costello, J.J., Ding, H., Garcia-Moreno, J., Gill, M., Haase, P., Jones, M., Julliard, R., Magnusson, W.E., Martin, C.S., McGeoch, M., Mihoub, J-B., Pettorelli, N., Proenca, V., Peng, C., Regan, E., Schmiedel, U., Simaika, J.P., Weatherdon, L., Waterman, C., Xu, H., Belnap, J., 2017, Building capacity in biodiversity monitoring at the global scale: Biodiversity and Conservation, v. 26, no. 12, p. 2765-2790, http://dx.doi.org/10.1007/s10531-017-1388-7.

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Year Published: 2017

Short-term and long-term evapotranspiration rates at ecological restoration sites along a large river receiving rare flow events

Many large rivers around the world no longer flow to their deltas, due to ever greater water withdrawals and diversions for human needs. However, the importance of riparian ecosystems is drawing increasing recognition, leading to the allocation of environmental flows to restore river processes. Accurate estimates of riparian plant...

Shanafield, Margaret; Jurado, Hugo Gutierrez; Burgueño, Jesús Eliana Rodríguez; Hernández, Jorge Ramírez; Jarchow, Christopher; Nagler, Pamela L.
Shanafield, Margaret, Hugo Gutierrez Jurado, , J. Eliana Rodriguez-Burgueño,, Jorge Ramírez-Hernández,, Christopher J. Jarchow, Pamela L .Nagler, (2017). Short-term and long-term evapotranspiration rates at ecological restoration sites along a large river receiving rare flow events. Hydrological Processes. . 10.1002/hyp.11359.

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Year Published: 2017

The concurrent use of novel soil surface microclimate measurements to evaluate CO2 pulses in biocrusted interspaces in a cool desert ecosystem

Carbon cycling associated with biological soil crusts, which occupy interspaces between vascular plants in drylands globally, may be an important part of the coupled climate-carbon cycle of the Earth system. A major challenge to understanding CO2 fluxes in these systems is that much of the biotic and biogeochemical activity occurs in the...

Tucker, Colin; McHugh, Theresa A.; Howell, Armin J.; Gill, Richard; Weber, Bettina; Belnap, Jayne; Grote, Edmund E.; Reed, Sasha C.
Tucker, C.L., McHugh, T.A., Howell, A., Gill, R., Weber, B., Belnap, J., Grote, E., and Reed, S.C., 2017, The concurrent use of novel soil surface microclimate measurements to evaluate CO2 pulses in biocrusted interspaces in a cool desert ecosystem: Biogeochemistry, v. 135, no. 3, p. 239-249, http://dx.doi.org/10.1007/s10533-017-0372-3.

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Year Published: 2017

Compositional signatures in acoustic backscatter over vegetated and unvegetated mixed sand-gravel riverbeds

Multibeam acoustic backscatter has considerable utility for remote characterization of spatially heterogeneous bed sediment composition over vegetated and unvegetated riverbeds of mixed sand and gravel. However, the use of high-frequency, decimeter-resolution acoustic backscatter for sediment classification in shallow water is hampered by...

Buscombe, Daniel; Grams, Paul E.; Kaplinski, Matthew A.
Buscombe, D., Grams, P.E., and Kaplinski, M.A., 2017, Compositional signatures in acoustic backscatter over vegetated and unvegetated mixed sand-gravel riverbeds: Journal of Geophysical Research Earth Surface, v. (online), http://dx.doi.org/10.1002/2017JF004302.

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Year Published: 2017

Durable terrestrial bedrock predicts submarine canyon formation

Though submarine canyons are first-order topographic features of Earth, the processes responsible for their occurrence remain poorly understood. Potentially analogous studies of terrestrial rivers show that the flux and caliber of transported bedload are significant controls on bedrock incision. Here we hypothesize that coarse sediment load could...

Smith, Elliot; Finnegan, Noah J.; Mueller, Erich R.; Best, Rebecca J.
Smith, E.M., Finnegan, N.J., Mueller, E.R., and Best, R.J., 2017, Durable Terrestrial Bedrock Predicts Submarine Canyon Formation: Geophysical Research Letters, v. (online), http://dx.doi.org/10.1002/2017GL075139.

Filter Total Items: 239
Image: Dowitcher Feeding
July 18, 2008

Dowitcher Feeding

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Salton Sea Birds
July 18, 2008

Salton Sea Birds

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: American Avocet
July 18, 2008

American Avocet

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: White-faced Ibis and Egrets
June 28, 2008

White-faced Ibis and Egrets

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image:  Black Skimmer and Gull-billed Tern Nesting Colony
June 20, 2008

Black Skimmer and Gull-billed Tern Nesting Colony

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Gull-billed Tern
June 20, 2008

Gull-billed Tern

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Black Skimmer
June 20, 2008

Black Skimmer

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image:  Black Skimmer and Gull-billed Tern Nesting Colony
May 21, 2008

Black Skimmer and Gull-billed Tern Nesting Colony

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: American Avocet Feeding
April 29, 2008

American Avocet Feeding

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Egret
April 16, 2008

Egret

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Egret
April 16, 2008

Egret

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Least Sandpiper
April 16, 2008

Least Sandpiper

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.