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Late Holocene slowdown of the Indian Ocean Walker circulation
Changes in tropical zonal atmospheric (Walker) circulation induce shifts in rainfall patterns along with devastating floods and severe droughts that dramatically impact the lives of millions of people. Historical records and observations of the Walker circulation over the 20th century disagree on th...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Nature Publishing Group UK
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5715104/ https://www.ncbi.nlm.nih.gov/pubmed/29044105 http://dx.doi.org/10.1038/s41467-017-00855-3 |
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author | Mohtadi, Mahyar Prange, Matthias Schefuß, Enno Jennerjahn, Tim C. |
author_facet | Mohtadi, Mahyar Prange, Matthias Schefuß, Enno Jennerjahn, Tim C. |
author_sort | Mohtadi, Mahyar |
collection | PubMed |
description | Changes in tropical zonal atmospheric (Walker) circulation induce shifts in rainfall patterns along with devastating floods and severe droughts that dramatically impact the lives of millions of people. Historical records and observations of the Walker circulation over the 20th century disagree on the sign of change and therefore, longer climate records are necessary to better project tropical circulation changes in response to global warming. Here we examine proxies for thermocline depth and rainfall in the eastern tropical Indian Ocean during the globally colder Last Glacial Maximum (19–23 thousand years ago) and for the past 3000 years. We show that increased thermocline depth and rainfall indicate a stronger-than-today Walker circulation during the Last Glacial Maximum, which is supported by an ensemble of climate simulations. Our findings underscore the sensitivity of tropical circulation to temperature change and provide evidence for a further weakening of the Walker circulation in response to greenhouse warming. |
format | Online Article Text |
id | pubmed-5715104 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-57151042017-12-06 Late Holocene slowdown of the Indian Ocean Walker circulation Mohtadi, Mahyar Prange, Matthias Schefuß, Enno Jennerjahn, Tim C. Nat Commun Article Changes in tropical zonal atmospheric (Walker) circulation induce shifts in rainfall patterns along with devastating floods and severe droughts that dramatically impact the lives of millions of people. Historical records and observations of the Walker circulation over the 20th century disagree on the sign of change and therefore, longer climate records are necessary to better project tropical circulation changes in response to global warming. Here we examine proxies for thermocline depth and rainfall in the eastern tropical Indian Ocean during the globally colder Last Glacial Maximum (19–23 thousand years ago) and for the past 3000 years. We show that increased thermocline depth and rainfall indicate a stronger-than-today Walker circulation during the Last Glacial Maximum, which is supported by an ensemble of climate simulations. Our findings underscore the sensitivity of tropical circulation to temperature change and provide evidence for a further weakening of the Walker circulation in response to greenhouse warming. Nature Publishing Group UK 2017-10-18 /pmc/articles/PMC5715104/ /pubmed/29044105 http://dx.doi.org/10.1038/s41467-017-00855-3 Text en © The Author(s) 2017 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Mohtadi, Mahyar Prange, Matthias Schefuß, Enno Jennerjahn, Tim C. Late Holocene slowdown of the Indian Ocean Walker circulation |
title | Late Holocene slowdown of the Indian Ocean Walker circulation |
title_full | Late Holocene slowdown of the Indian Ocean Walker circulation |
title_fullStr | Late Holocene slowdown of the Indian Ocean Walker circulation |
title_full_unstemmed | Late Holocene slowdown of the Indian Ocean Walker circulation |
title_short | Late Holocene slowdown of the Indian Ocean Walker circulation |
title_sort | late holocene slowdown of the indian ocean walker circulation |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5715104/ https://www.ncbi.nlm.nih.gov/pubmed/29044105 http://dx.doi.org/10.1038/s41467-017-00855-3 |
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