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Regions L2 Landing Page Tabs

Filter Total Items: 2,176
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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

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Year Published: 2017

Sand pulses and sand patches on the Colorado River in Grand Canyon

Alluvial sandbars occur in lateral recirculation zones (eddies) along the Colorado River in Grand Canyon National Park (Schmidt, 1990). Resource managers periodically release controlled floods from the upstream Glen Canyon Dam to rebuild these bars (Grams et al., 2015), which erode during fluctuating dam releases, and by hillslope runoff and wind...

Grams, Paul E.; Buscombe, Daniel; Topping, David; Mueller, Erich R.
Grams P.E., Buscombe D., Topping D.J. and Mueller E.R., 2017, Sand Pulses and Sand Patches on the Colorado River in Grand Canyon—extended 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. 183, http://events.unitn.it/sites/events.unitn.it/files/download/rcem17/rcem-bookofabstract-ebook_0.pdf.

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Year Published: 2017

Spatial data analytics on heterogeneous multi- and many-core parallel architectures using python

Parallel vector spatial analysis concerns the application of parallel computational methods to facilitate vector-based spatial analysis. The history of parallel computation in spatial analysis is reviewed, and this work is placed into the broader context of high-performance computing (HPC) and parallelization research. The rise of cyber...

Laura, Jason R.; Rey, Sergio J.
Laura, Jason, and Rey, Sergio J., 2016, Spatial Data Analytics on Heterogeneous Multi- and Many-Core Parallel Architectures Using Python, in Shekhar, S., et al., eds.: Encyclopedia of GIS, Springer, 10 p., doi:10.1007/978-3-319-23519-6_1569-1.

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Year Published: 2017

The sand dunes of the Colorado River, Grand Canyon, USA

The flow (Wright and Kaplinski, 2011), suspended sediment transport (Topping et al., 2000), sediment storage (Grams et al., 2013), and sedimentology of sandbars (Rubin et al., 1998) of the 250 miles of the Colorado River that run through Grand Canyon National Park have been well studied and described. However, there has been little systematic or...

Buscombe, Daniel; Kaplinski, Matthew; Grams, Paul E.; Ashley, Thomas; McElroy, Brandon; Rubin, David M.
Buscombe D., Kaplinski M., Grams P.E., Ashley T., McElroy B.J. and Rubin D.M. , 2017, The sand dunes of the Colorado River, Grand Canyon, USA—extended 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. 161, http://events.unitn.it/sites/events.unitn.it/files/download/rcem17/rcem-bookofabstract-ebook_0.pdf.

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Year Published: 2017

Turtles: Freshwater

With their iconic shells, turtles are morphologically distinct in being the only extant or extinct vertebrate animals to have their shoulders and hips inside their rib cages. By the time an asteroid hit the earth 65.5 million years ago, causing the extinction of dinosaurs, turtles were already an ancient lineage that was 70% through their...

Gibbons, J. Whitfield; Lovich, Jeffrey E.; Bowden, R.M.
Gibbons, J.W., Lovich, J., and Bowden, R.M., 2017, Turtles--Freshwater, in Encyclopedia of animal behavior--Reference module in Life Sciences: Amsterdam, The Netherlands, Elsevier, p. 462-468, http://www.sciencedirect.com/science/article/pii/B9780128096338012188.

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Year Published: 2017

Hatching success and predation of Bog Turtle (Glyptemys muhlenbergii) eggs in New Jersey and Pennsylvania

Nest-site selection by most turtles affects the survival of females and their offspring. Although bog turtles (Glyptemys muhlenbergii) do not typically leave their wetlands for nesting, nest-site selection can impact hatching success and hatchling survival. Between 1974 and 2012, we monitored the fates of 258 bog turtle eggs incubated in the field...

Zappalorti, Robert T.; Tutterow, Annalee M.; Pittman, Shannon E.; Lovich, Jeffrey E.
Zappalorti, R.T., Tutterow, A.L., Pittman, S.E., and Lovich, J.E., 2017, in press, Hatching success and predation of bog turtle (Glyptemys muhlenbergii) eggs in New Jersey and Pennsylvania: Chelonian Conservation and Biology, v. (online), https://doi.org/10.2744/CCB-1237.1.

Filter Total Items: 239
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: 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
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.