Moisture availability in the southwest United States over the last three glacial-interglacial cycles


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Material Information

Title:
Moisture availability in the southwest United States over the last three glacial-interglacial cycles
Series Title:
Science Advances
Creator:
Wendt, A. Kathleen
Dublyansky, Yuri V.
Moseley, Gina E.
Edwards, R. Lawrence
Cheng, Hai
Spötl, Christoph
Publisher:
The American Association for the Advancement of Science
Publication Date:
Language:
English

Subjects

Subjects / Keywords:
Climatology ( local )
Genre:
serial ( sobekcm )

Notes

Abstract:
The projected long-term drying of the southwest (SW) United States in response to climate warming raises a sobering alarm for this already water-limited region, yet the climatic controls on moisture availability over longer time scales remain a topic of debate. Here, we present a 350,000-year record of past water table fluctuations in Devils Hole 2 cave that are driven by variations in recharge amount to the local groundwater flow system. Because of the unprecedented length and precision of our record, we can observe variations in regional moisture availability over the last three glacial-interglacial cycles at a millennial-scale resolution. The timing of past water table rises and falls (>9 m in amplitude) closely coincides with the expansion and reduction of Northern Hemisphere ice volume, which in turn influences the position and intensity of westerly winter storms on orbital time scales. Superimposed on this long-term trend are millennial-scale highstands recorded during the last glaciation that coincide with North Atlantic Heinrich events. Earlier millennial-scale highstands provide the first evidence of multiple short-lived wet periods in the SW United States linksed to coeval cooling intervals in the North Atlantic during marine isotope stages 6 and 8. The Devils Hole 2 water table record is currently the longest independently dated paleomoisture record in the SW United States and thus provides a critical testbed to examine the controls on regional moisture availability over larger time scales.
Original Version:
Science Advances, Vol. 4, no. 10 (2018-10-24).

Record Information

Source Institution:
University of South Florida Library
Holding Location:
University of South Florida
Rights Management:
This item is licensed with the Creative Commons Attribution License. This license lets others distribute, remix, tweak, and build upon this work, even commercially, as long as they credit the author for the original creation.
Resource Identifier:
K26-05091 ( USFLDC: LOCAL DOI )
k26.5091 ( USFLDC: LOCAL Handle )

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University of South Florida
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