Arid
DOI10.2475/04.2014.01
URANIUM ISOTOPES IN SOILS AS A PROXY FOR PAST INFILTRATION AND PRECIPITATION ACROSS THE WESTERN UNITED STATES
Maher, Kate1; Ibarra, Daniel E.1; Oster, Jessica L.2; Miller, David M.3; Redwine, Joanna L.3; Reheis, Marith C.4; Harden, Jennifer W.3
通讯作者Maher, Kate
来源期刊AMERICAN JOURNAL OF SCIENCE
ISSN0002-9599
EISSN1945-452X
出版年2014
卷号314期号:4页码:821-857
英文摘要

The intermittent presence of large Pleistocene lakes in the southwestern interior of North America, a region that is now a semi-arid desert, suggests repeated oscillations between profoundly different climatic conditions. The origin of these shifts is still unresolved due to inconsistencies in existing climate proxy data (for example, pollen, lake levels, and oxygen isotopes in speleothems). To resolve the inconsistencies in the water balance over the last 10 to 60 kyr, we use uranium isotopic variations in secondary soil minerals to quantify net infiltration and precipitation along a north-south transect in western North America. We show that winter infiltration increased by 30 to 100 percent, and precipitation by a lesser amount, in the valleys of the Great Basin and Mojave deserts between 60 and similar to 26 ka. This increase in infiltration and precipitation preceded the Last Glacial Maximum (LGM) and the timing of most lake highstands in the region by 5 to 10 kyr, respectively, suggesting a possible Last Precipitation Maximum (LPM) that coincided with a minimum in winter insolation. Subsequent decreases in infiltration and precipitation after the LGM can be reconciled with the timing of lake highstands if colder summer temperatures due to a minimum in summer insolation reduced lake evaporation. The soil records, combined with a range of proxy data, suggest that seasonal insolation is the long-term driver for large shifts in both precipitation and surface water variability in the region.


英文关键词Paleohydrology soil carbonate U-series geochronology pluvial lakes
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000345105100001
WOS关键词MIDLATITUDE NORTH PACIFIC ; SEA-SURFACE TEMPERATURE ; YUCCA MOUNTAIN ; U-SERIES ; LATE-PLEISTOCENE ; GREAT-BASIN ; PLUVIAL-LAKE ; ENVIRONMENTAL TRACERS ; GROUNDWATER RECHARGE ; PEDOGENIC CARBONATE
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
来源机构United States Geological Survey
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/180591
作者单位1.Stanford Univ, Dept Geol & Environm Sci, Stanford, CA 94305 USA;
2.Vanderbilt Univ, Dept Earth & Environm Sci, Nashville, TN 37240 USA;
3.US Geol Survey, Menlo Pk, CA 94301 USA;
4.US Geol Survey, Denver, CO 80225 USA
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GB/T 7714
Maher, Kate,Ibarra, Daniel E.,Oster, Jessica L.,et al. URANIUM ISOTOPES IN SOILS AS A PROXY FOR PAST INFILTRATION AND PRECIPITATION ACROSS THE WESTERN UNITED STATES[J]. United States Geological Survey,2014,314(4):821-857.
APA Maher, Kate.,Ibarra, Daniel E..,Oster, Jessica L..,Miller, David M..,Redwine, Joanna L..,...&Harden, Jennifer W..(2014).URANIUM ISOTOPES IN SOILS AS A PROXY FOR PAST INFILTRATION AND PRECIPITATION ACROSS THE WESTERN UNITED STATES.AMERICAN JOURNAL OF SCIENCE,314(4),821-857.
MLA Maher, Kate,et al."URANIUM ISOTOPES IN SOILS AS A PROXY FOR PAST INFILTRATION AND PRECIPITATION ACROSS THE WESTERN UNITED STATES".AMERICAN JOURNAL OF SCIENCE 314.4(2014):821-857.
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