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Moisture availability in the southwest United States over the last three glacial-interglacial cycles
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...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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American Association for the Advancement of Science
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6200359/ https://www.ncbi.nlm.nih.gov/pubmed/30397648 http://dx.doi.org/10.1126/sciadv.aau1375 |
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author | Wendt, Kathleen A. Dublyansky, Yuri V. Moseley, Gina E. Edwards, R. Lawrence Cheng, Hai Spötl, Christoph |
author_facet | Wendt, Kathleen A. Dublyansky, Yuri V. Moseley, Gina E. Edwards, R. Lawrence Cheng, Hai Spötl, Christoph |
author_sort | Wendt, Kathleen A. |
collection | PubMed |
description | 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 linked 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. |
format | Online Article Text |
id | pubmed-6200359 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | American Association for the Advancement of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-62003592018-11-05 Moisture availability in the southwest United States over the last three glacial-interglacial cycles Wendt, Kathleen A. Dublyansky, Yuri V. Moseley, Gina E. Edwards, R. Lawrence Cheng, Hai Spötl, Christoph Sci Adv Research Articles 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 linked 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. American Association for the Advancement of Science 2018-10-24 /pmc/articles/PMC6200359/ /pubmed/30397648 http://dx.doi.org/10.1126/sciadv.aau1375 Text en Copyright © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY). http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Research Articles Wendt, Kathleen A. Dublyansky, Yuri V. Moseley, Gina E. Edwards, R. Lawrence Cheng, Hai Spötl, Christoph Moisture availability in the southwest United States over the last three glacial-interglacial cycles |
title | Moisture availability in the southwest United States over the last three glacial-interglacial cycles |
title_full | Moisture availability in the southwest United States over the last three glacial-interglacial cycles |
title_fullStr | Moisture availability in the southwest United States over the last three glacial-interglacial cycles |
title_full_unstemmed | Moisture availability in the southwest United States over the last three glacial-interglacial cycles |
title_short | Moisture availability in the southwest United States over the last three glacial-interglacial cycles |
title_sort | moisture availability in the southwest united states over the last three glacial-interglacial cycles |
topic | Research Articles |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6200359/ https://www.ncbi.nlm.nih.gov/pubmed/30397648 http://dx.doi.org/10.1126/sciadv.aau1375 |
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