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Regions L2 Landing Page Tabs

Filter Total Items: 2,184
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Year Published: 2017

Linking fluvial and aeolian morphodynamics in the Grand Canyon, USA

In river valleys, fluvial and upland landscapes are intrinsically linked through sediment exchange between the active channel, near-channel fluvial deposits, and higher elevation upland deposits. During floods, sediment is transferred from channels to low-elevation nearchannel deposits [Schmidt and Rubin, 1995]. Particularly in dryland river...

Kasprak, Alan; Bangen, Sara G.; Buscombe, Daniel; Caster, Joshua; East, Amy E.; Grams, Paul E.; Sankey, Joel B.
Kasprak, A., Bangen, S., Buscombe, D., Caster, J., East, A., Grams, P., and Sankey, J., 2017, Linking Fluvial and Aeolian Morphodynamics in the Grand Canyon, USAextended abstract in Lanzoni, S., Redolfi, M., and Zolezzi, G., eds., RCEM 2017 – Back to Italy—The 10th Symposium on River, Coastal and Estuarine Morphodynamics: Trento-Padova, Italy, September 15-22, 2017, p. 204, http://events.unitn.it/sites/events.unitn.it/files/download/rcem17/rcem-bookofabstract-ebook_0.pdf.

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Year Published: 2017

Population expansion of Humpback chub in western Grand Canyon and hypothesized mechanisms

Humpback chub, Gila cypha, is an endangered warm water fish endemic to the Colorado River basin of southwestern North America. In Grand Canyon National Park, cold hypolimnetic water-release temperatures from Glen Canyon Dam have largely precluded successful spawning and recruitment of humpback chub in the mainstem Colorado River. Therefore,...

VanHaverbeke, David R.; Stone, Dennis M.; Dodrill, Michael; Young, Kirk L.; Pillow, Michael J.
Van Haverbeke, D.R., Stone, D.M., Dodrill, M.J., Young, K.L., and Pillow, M.J., 2017, Population expansion of Humpback chub in western Grand Canyon and hypothesized mechanisms: The Southwestern Naturalist, v. 62, no. 4, p. 285-292, https://doi.org/10.1894/0038-4909-62.4.285.

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Year Published: 2017

Case studies of capacity building for biodiversity monitoring: Chapter 13

Monitoring the status and trends of species is critical to their conservation and management. However, the current state of biodiversity monitoring is insufficient to detect such for most species and habitats, other than in a few localised areas. One of the biggest obstacles to adequate monitoring is the lack of local capacity to carry out such...

Walters, Michele; Scholes, Robert J.; Schmeller, Dirk S.; Arvanitidis, Christos; Böhm, Monika; Brummitt, Neil; Chatzinikolaou, Eva; Costello, Mark John; Ding, Hui; Gill, Michael J.; Haase, Peter; Juillard, Romain; García-Moreno, Jaime; Pettorelli, Nathalie; Peng, Cui; Riginos, Corinna; Schmiedel, Ute; Simaika, John P.; Waterman, Carly; Wu, Jun; Xu, Haigen; Belnap, Jayne
Schmeller, D.S., Arvanitidis, C., Böhm, M., Brummitt, N., Chatzinikolaou, E., Costello, M.J., Ding, H., Gill, M.J., Haase, P., Julliard, R., García-Moreno, J., Pettorelli, N., Peng, C., Riginos, C., Schmiedel, U., Simaika, J.P., Waterman, C., Wu, J., Xu, H., and Belnap, J., 2017, Case studies of capacity building for biodiversity monitoring in Walters, M., and Scholes, R.J., The GEO Handbook on Biodiversity Observation Networks: Cham, Switzerland, Springer International Publishing, Springer Nature, p. 309-326, https://link.springer.com/chapter/10.1007/978-3-319-27288-7_13.

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Year Published: 2017

Groundwater, surface-water, and water-chemistry data, Black Mesa area, northeastern Arizona—2013–2015

The Navajo (N) aquifer is an extensive aquifer and the primary source of groundwater in the 5,400-square-mile Black Mesa area in northeastern Arizona. Availability of water is an important issue in northeastern Arizona because of continued water requirements for industrial and municipal use by a growing population and because of low precipitation...

Macy, Jamie P.; Mason, Jon P.
Macy, J.P., and Mason, J.P., 2017, Groundwater, surface-water, and water-chemistry data, Black Mesa area, northeastern Arizona—2013–2015: U.S. Geological Survey Open-File Report 2017–1127, 49 p., https://doi.org/10.3133/ofr20171127.

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Year Published: 2017

Evidence for the interior evolution of Ceres from geologic analysis of fractures

Ceres is the largest asteroid belt object, and the Dawn spacecraft observed Ceres since 2015. Dawn observed two morphologically distinct linear features on Ceres's surface: secondary crater chains and pit chains. Pit chains provide unique insights into Ceres's interior evolution. We interpret pit chains called the Samhain Catenae as the surface...

Scully, Jennifer E. C.; Buczkowski, Debra; Schmedemann, Nico; Raymond, Carol A.; Castillo-Rogez, Julie C.; Scott King; Bland, Michael T.; Ermakov, Anton; O'Brien, D.P.; Marchi, S.; Longobardo, A.; Russell, C.T.; Fu, R.R.; Neveu, M.
Scully, J. E. C., Buczkowski, D. L., Schmedemann, N., Raymond, C. A., Castillo-Rogez, J. C., King, S. D., … Neveu, M. (2017). Evidence for the interior evolution of Ceres from geologic analysis of fractures. Geophysical Research Letters, 44, 9564–9572. https://doi.org/10.1002/2017GL075086

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Year Published: 2017

Basalt–trachybasalt samples in Gale Crater, Mars

The ChemCam instrument on the Mars Science Laboratory (MSL) rover, Curiosity, observed numerous igneous float rocks and conglomerate clasts, reported previously. A new statistical analysis of single‐laser‐shot spectra of igneous targets observed by ChemCam shows a strong peak at ~55 wt% SiO2 and 6 wt% total alkalis, with a minor...

Edwards, Peter H.; Bridges, John C.; Wiens, Roger C.; Anderson, Ryan B.; Dyar, M. Darby; Fisk, Martin; Thompson, Lucy; Gasda, Patrick J.; Filiberto, Justin; Schwenzer, Susanne P.; Blaney, Diana L.; Hutchinson, Ian

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Year Published: 2017

Preface: The lunar reconnaissance orbiter

When the call for papers for a special issue of Icarus devoted to analysis of data from the Lunar Reconnaissance Orbiter mission was announced in March 2015 we envisioned a single issue with only a possibility of a second. We certainly were gratified by the response from within and outside the LRO instrument teams such that we were compelled to...

Keller, John W; Gaddis, Lisa R.; Petro, Noah E.; Aharonson, Oded
Keller, John W., Gaddis, L., Petro, N., and Aharonson, O., 2017, Preface--The Lunar Reconnaissance Orbiter: Icarus, v. 298, 1 p., https://doi.org/10.1016/j.icarus.2017.09.001.

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Year Published: 2017

CO2 cycle

This chapter discusses the use of models, observations, and laboratory experiments to understand the cycling of CO2 between the atmosphere and seasonal Martian polar caps. This cycle is primarily controlled by the polar heat budget, and thus the emphasis here is on its components, including solar and infrared radiation, the effect of clouds (water...

Titus, Timothy N.; Byrne, Shane; Colaprete, Anthony; Forget, Francois; Michaels, Timothy I.; Prettyman, Thomas H.

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Year Published: 2017

Community tools for cartographic and photogrammetric processing of Mars Express HRSC images

The High Resolution Stereo Camera (HRSC) on the Mars Express orbiter (Neukum et al. 2004) is a multi-line pushbroom scanner that can obtain stereo and color coverage of targets in a single overpass, with pixel scales as small as 10 m at periapsis. Since commencing operations in 2004 it has imaged ~ 77 % of Mars at 20 m/pixel or better. The...

Wu, B.; Di, K.; Oberst, J.; Karachevtseva, I.; Kirk, Randolph L.; Howington-Kraus, Elpitha; Edmundson, Kenneth L.; Redding, Bonnie L.; Galuszka, Donna M.; Hare, Trent M.; Gwinner, K.
Kirk, R.L., Howington-Kraus, E., Edmundson, K., Redding, B., Galuszka, D., Hare, T., and Gwinner, K.: Community tools for cartographic and photogrammetric processing of Mars express HiRISE images, International Archives of Photogrammetry and Remote Sensing, v. XLII-3/W1, p. 69-76, https://doi.org/10.5194/isprs-archives-XLII-3-W1-69-2017, 2017.

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Year Published: 2017

Correcting spacecraft jitter in HiRISE images

Mechanical oscillations or vibrations on spacecraft, also called pointing jitter, cause geometric distortions and/or smear in high resolution digital images acquired from orbit. Geometric distortion is especially a problem with pushbroom type sensors, such as the High Resolution Imaging Science Experiment (HiRISE) instrument on board the Mars...

Wu, B.; Di, K.; Oberst, J.; Karachevtseva, I.; Sutton, S. S.; Boyd, A.K.; Kirk, Randolph L.; Cook, Debbie; Backer, Jean; Fennema, A.; Heyd, R.; McEwen, A.S.; Mirchandani, S.D.
Sutton, S.S., Boyd, A.K., Kirk, R.L., Cook, D., Backer, J.W., Fennema, A., Heyd, R., McEwen, A.S., and Mirchandani, S.D., 2017, Correcting spacecraft jitter in HiRISE images: International Archives of Photogrammetry and Remote Sensing, v. XLII-3/W1, p. 141-148, https://doi.org/10.5194/isprs-archives-XLII-3-W1-141-2017.

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Year Published: 2017

Quantifying animal movement for caching foragers: the path identification index (PII) and cougars, Puma concolor

Relocation studies of animal movement have focused on directed versus area restricted movement, which rely on correlations between step-length and turn angles, along with a degree of stationarity through time to define behavioral states. Although these approaches may work well for grazing foraging strategies in a patchy landscape, species that do...

Ironside, Kirsten E.; Mattson, David J.; Theimer, Tad; Jansen, Brian; Holton, Brandon; Arundel, Terence R.; Peters, Michael; Sexton, Joseph O.; Edwards, Thomas C.
Ironside, K.E., Mattson, D.J., Theimer, T., Jansen, B., Holton, B., Arundel, T., Peters, M., Sexton, J.O., and Edwards Jr., T.C., 2017, Quantifying animal movement for caching foragers: The path identification index (PII) and cougars, Puma concolor: Movement Ecology, v. (online), https://doi.org/10.1186/s40462-017-0115-z.

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Year Published: 2017

Reviews and syntheses: Field data to benchmark the carbon cycle models for tropical forests

For more accurate projections of both the global carbon (C) cycle and the changing climate, a critical current need is to improve the representation of tropical forests in Earth system models. Tropical forests exchange more C, energy, and water with the atmosphere than any other class of land ecosystems. Further, tropical-forest C cycling is...

Clark, Deborah A.; Asao, Shinichi; Fisher, Rosie A.; Reed, Sasha C.; Reich, Peter B.; Ryan, Michael G.; Wood, Tana E.; Yang, Xiaojuan
Clark, Deborah A., , Shinichi Asao, Rosie Fisher, Sasha Reed, Peter B. Reich, Michael G. Ryan, Tana E. Wood, and Xiaojuan Yang. 2017. Reviews and syntheses: Field data to benchmark the carbon cycle models for tropical forests. Biogeosciences, 14, 4663-4690, 2017 https://doi.org/10.5194/bg-14-4663-2017 Volume 14, issue 20

Filter Total Items: 239
Image: Snow Geese
November 19, 2008

Snow Geese

Birds found in and around the the Sonny Bono Refuge in southern Salton Sea, California.

Attribution: Southwest
Image: Great Egret and Snowy Egret
November 19, 2008

Great Egret and Snowy Egret

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Snow Geese
November 19, 2008

Snow Geese

Birds found in and around the the Sonny Bono Refuge in southern Salton Sea, California.

Attribution: Southwest
Image: Snow Geese
November 19, 2008

Snow Geese

Birds found in and around the the Sonny Bono Refuge in southern Salton Sea, California.

Attribution: Southwest
Image: Great Egret
November 19, 2008

Great Egret

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Snow Geese
November 19, 2008

Snow Geese

Birds found in and around the the Sonny Bono Refuge in southern Salton Sea, California.

Attribution: Southwest
Image: Snow Geese
November 19, 2008

Snow Geese

Birds found in and around the the Sonny Bono Refuge in southern Salton Sea, California.

Attribution: Southwest
Image: Dowitcher Feeding
November 19, 2008

Dowitcher Feeding

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Dowitcher Feeding
November 19, 2008

Dowitcher Feeding

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Stream Gage on the eastern bank of the Salton Sea now sits out of the water due to retreating shoreline.
November 3, 2008

Stream Gage sits high and dry on the eastern shore of the Salton Sea

Stream gage #10254005 located near Westmorland, CA, on the eastern shore of the Salton Sea, now sits out of the water as the Salton Sea continues to evaporate and the shoreline retreats.

Image: American Avocet
July 18, 2008

American Avocet

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Dowitcher
July 18, 2008

Dowitcher

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.