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Changing amounts and sources of moisture in the U.S. southwest since the Last Glacial Maximum in response to global climate change

Earth and Planetary Science Letters

By:
, , , , , , , ,
DOI: 10.1016/j.epsl.2014.05.046

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Abstract

The U.S. southwest has a limited water supply and is predicted to become drier in the 21st century. An improved understanding of factors controlling moisture sources and availability is aided by reconstruction of past responses to global climate change. New stable isotope and growth-rate records for a central Texas speleothem indicate a strong influence of Gulf of Mexico (GoM) moisture and increased precipitation from 15.5 to 13.5 ka, which includes the majority of the Bølling–Allerød warming (BA: 14.7–12.9 ka). Coeval speleothem records from 900 and 1200 km to the west allow reconstruction of regional moisture sources and atmospheric circulation. The combined isotope and growth-rate time series indicates 1) increased GoM moisture input during the majority of the BA, producing greater precipitation in Texas and New Mexico; and 2) a retreat of GoM moisture during Younger Dryas cooling (12.9–11.5 ka), reducing precipitation. These results portray how late-Pleistocene atmospheric circulation and moisture distribution in this region responded to global changes, providing information to improve models of future climate.

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Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Changing amounts and sources of moisture in the U.S. southwest since the Last Glacial Maximum in response to global climate change
Series title:
Earth and Planetary Science Letters
DOI:
10.1016/j.epsl.2014.05.046
Volume
401
Year Published:
2014
Language:
English
Publisher:
Elsevier
Contributing office(s):
Eastern Geology and Paleoclimate Science Center
Description:
10 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Earth and Planetary Science Letters
First page:
47
Last page:
56
Number of Pages:
10
Country:
United States
State:
Texas