منابع مشابه
Plateau and Great Basin
The Great Basin and Plateau encompass a vast region of western North America bracketed on the west by the Sierra Nevada and Cascade mountains and the east by the Rocky Mountains (Figure 1). The region is diverse but characterized by ecologically limiting, generally more arid conditions, and higher elevations than other parts of North America. It is also characterized by a type of archaeology th...
متن کاملA brief history of Great Basin pikas
The recent discovery that seven of the 25 historically described populations of American pikas (Ochotona princeps Richardson) in the Great Basin of western North America appear to be extinct (Beever et al., 2003) has added emphasis to earlier warnings that Great Basin populations of this animal are highly vulnerable (McDonald & Brown, 1992). Here, I use archaeological and palaeontological recor...
متن کاملGreat Basin Vegetation in the Late Pleistocene
Paleoecological sources indicate that the location and extent of Sierra Nevada rangelands have varied significantly during the last 20,000 years. Modern vegetative associations are recent, with montane wet meadows appearing during the last 3,000 years. A late Pleistocene sagebrush grassland existed where montane and subalpine forests occur today. In the central Sierra a pattern of deglaciation ...
متن کاملRadionuclides in the Great Lakes basin.
The Great Lakes basin is of radiologic interest due to the large population within its boundaries that may be exposed to various sources of ionizing radiation. Specific radionuclides of interest in the basin arising from natural and artificial sources include 3H, 14C, 90Sr, 129I, 131I, 137Cs, 222Rn, 226Ra, 235U, 238U, 239Pu, and 241Am. The greatest contribution to total radiation exposure is th...
متن کاملCalculation of environmental water requirement in Great Karoun basin and upper Karoun sub-basin
The environmental requirement of the river is the amount of water to maintain natural ecological conditions and health of quality of the river water. In this study, to estimate the environmental water requirement of Karoun River, Dez, Great Karoun and Beheshtabad sub-basin (upper Karoun) using hydrological Montana method and offers based on frequency analysis of hydrological flow normally and u...
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ژورنال
عنوان ژورنال: Monthly Weather Review
سال: 1911
ISSN: 0027-0644,1520-0493
DOI: 10.1175/1520-0493(1911)39<1248a:dngb>2.0.co;2