Arid
DOI10.1029/2011GL047242
Beryllium-7 in soils and vegetation along an arid precipitation gradient in Owens Valley, California
Kaste, James M.1; Elmore, Andrew J.2; Vest, Kimberly R.2; Okin, Gregory S.3
通讯作者Kaste, James M.
来源期刊GEOPHYSICAL RESEARCH LETTERS
ISSN0094-8276
出版年2011
卷号38
英文摘要

Beryllium-7 is a potentially powerful tracer of atmospheric deposition and recent sediment transport, but the quantity and distribution of (7)Be on arid landscapes have not been described. We measured (7)Be in soil, vegetation, and dust in Owens Valley, California, and describe its distribution in aridisols and mollisols to evaluate its potential as a sediment tracer in desert environments. Beryllium-7 in vegetation and the upper few cm of soil is low but detectable (>20 Becquerels [Bq] m(-2)). Surface inventories of (7)Be at sites on the valley floor vary by a factor of five between the end of the rainy season (April) and the end of the dry season (November). In mollisols, live grasses hold similar to 50 Bq (7)Be m(-2), which is on the order of half of the total springtime surface inventory. We find that within-site variability at the 5 m scale is 5 to 22% (1 relative standard error) and can be explained by localized rain shadowing and erosion, but between site variability at the km scale can be explained by differences in rainfall. Our alpine site has more than triple the inventory that is predicted from the rainfall- (7)Be flux relationship that we generate using our springtime soil measurements and previously reported deposition data. Dust deposition does not appear to contribute significantly to (7)Be inventories, but anomalously high (7)Be on the eastern flank of the Sierras may be explained by a higher altitude air mass source and better scavenging efficiency of snow. Citation: Kaste, J. M., A. J. Elmore, K. R. Vest, and G. S. Okin (2011), Beryllium-7 in soils and vegetation along an arid precipitation gradient in Owens Valley, California, Geophys. Res. Lett., 38, L09401, doi: 10.1029/2011GL047242.


类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000290443400001
WOS关键词DEPOSITIONAL CHARACTERISTICS ; DRY LAKE ; BE-7 ; PB-210 ; RADIONUCLIDES ; VARIABILITY ; DESERT ; COVER ; AIR
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
来源机构University of California, Los Angeles
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/168298
作者单位1.Coll William & Mary, Dept Geol, Williamsburg, VA 23187 USA;
2.Univ Maryland, Ctr Environm Sci, Frostburg, MD 21532 USA;
3.Univ Calif Los Angeles, Dept Geog, Los Angeles, CA 90095 USA
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GB/T 7714
Kaste, James M.,Elmore, Andrew J.,Vest, Kimberly R.,et al. Beryllium-7 in soils and vegetation along an arid precipitation gradient in Owens Valley, California[J]. University of California, Los Angeles,2011,38.
APA Kaste, James M.,Elmore, Andrew J.,Vest, Kimberly R.,&Okin, Gregory S..(2011).Beryllium-7 in soils and vegetation along an arid precipitation gradient in Owens Valley, California.GEOPHYSICAL RESEARCH LETTERS,38.
MLA Kaste, James M.,et al."Beryllium-7 in soils and vegetation along an arid precipitation gradient in Owens Valley, California".GEOPHYSICAL RESEARCH LETTERS 38(2011).
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