نتایج جستجو برای: playas
تعداد نتایج: 275 فیلتر نتایج به سال:
Oregon is one of the most diverse states in the U.S., containing between six and ten nationally recognized ecoregions, depending on various ecoregion classifications. The state includes habitats which range from the moist and mild coast redwood forests of Curry County to the extremely dry playas of the Alvord Desert. Elevations range from coastal salt marshes at sea level, to alpine peaks over ...
[1] During the Ice in Clouds Experiment‐Layer Clouds (ICE‐L), dry lakebed, or playa, salts from the Great Basin region of the United States were observed as cloud nuclei in orographic wave clouds over Wyoming. Using a counterflow virtual impactor in series with a single‐particle mass spectrometer, sodium‐potassium‐magnesium‐calcium‐chloride salts were identified as residues of cloud droplets. I...
Dust Emission from Wet and Dry Playas in the Mojave Desert, USAt Richard L. Reynolds,'* James c. Yount, I Marith Reheis, ' Harland Goldstein,1 Pat Chavez, Jr.? Robert Fulton,3 John Whitney, I Christopher Fuller and Richard M. Forester' , US. Geologicol Survey. Denver, Co. USA 2 US Geological Survey. Flagstaff. AZ, USA liB R A R Y 3 California Desert Studies Consortium. California State Universi...
Sodium accumulating playas (also termed sodic or natric playas) are typically covered by polygonal crusts with different pattern characteristics, but little is known about the short-term (hours) dynamics of these patterns or how pore water may respond to or drive changing salt crust patterning and surface roughness. It is important to understand these interactions because playa-crust surface po...
Miocene continental saltpans are scattered in the Central Valley of the Atacama Desert, one of the driest regions on Earth. These evaporitic deposits are hydrologically inactive, and are detached from groundwater brines or aquifers. The surface of the saltpans, also known as salars, comprises desiccation polygons, commonly with nodular salt structures along their sides. The morphology and bulk ...
Modificaciones del perfil de playas en las Islas Baleares (playas de Can Picafort y Es Comú de Muro)
New observations and analyses are presented of the opposition effect on mud cracks (mud polygons) on desert playas. The enhanced brightness of the surface near the antisolar point has been previously and correctly ascribed to two sources: shadow-hiding and coherent backscatter. The observations reported here suggest that a third optical mechanism influences the OE: some parts of the mud polygon...
The 20,000 ephemeral ponds, the playas of the southern high plains of the United States, were thought to have experienced a prolonged drought ending approximately 5,000 years ago, during which amphibians and other aquatic residents would have died out. A few permanent ponds are conjectured to be the source of repopulation of the entire region since then. We develop a series of mathematical mode...
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