Extrapolar climate reversal during the last deglaciation

Abstract Large ocean-atmosphere and hydroclimate changes occurred during the last deglaciation, although the interplay between these changes remains ambiguous. Here, we present a speleothem-based high resolution record of Northern Hemisphere atmospheric temperature driven polar jet variability, whic...

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Autores principales:	Yemane Asmerom, Victor J. Polyak, Matthew S. Lachniet
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/45744b27e0234dc89cf9cffb98160359
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spelling	oai:doaj.org-article:45744b27e0234dc89cf9cffb981603592021-12-02T11:40:24ZExtrapolar climate reversal during the last deglaciation10.1038/s41598-017-07721-82045-2322https://doaj.org/article/45744b27e0234dc89cf9cffb981603592017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-07721-8https://doaj.org/toc/2045-2322Abstract Large ocean-atmosphere and hydroclimate changes occurred during the last deglaciation, although the interplay between these changes remains ambiguous. Here, we present a speleothem-based high resolution record of Northern Hemisphere atmospheric temperature driven polar jet variability, which matches the Greenland ice core records for the most of the last glacial period, except during the last deglaciation. Our data, combined with data from across the globe, show a dramatic climate reversal during the last deglaciation, which we refer to as the Extrapolar Climate Reversal (ECR). This is the most prominent feature in most tropical and subtropical hydroclimate proxies. The initiation of the ECR coincides with the rapid rise in CO2, in part attributed to upwelling in the Southern Ocean and the near collapse of the Atlantic Meridional Overturning Circulation. We attribute the ECR to upwelling of cold deep waters from the Southern Ocean. This is supported by a variety of proxies showing the incursion of deep Southern Ocean waters into the tropics and subtropics. Regional climate variability across the extropolar regions during the interval previously referred to as the “Mystery Interval” can now be explained in the context of the ECR event.Yemane AsmeromVictor J. PolyakMatthew S. LachnietNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-7 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Yemane Asmerom Victor J. Polyak Matthew S. Lachniet Extrapolar climate reversal during the last deglaciation
description	Abstract Large ocean-atmosphere and hydroclimate changes occurred during the last deglaciation, although the interplay between these changes remains ambiguous. Here, we present a speleothem-based high resolution record of Northern Hemisphere atmospheric temperature driven polar jet variability, which matches the Greenland ice core records for the most of the last glacial period, except during the last deglaciation. Our data, combined with data from across the globe, show a dramatic climate reversal during the last deglaciation, which we refer to as the Extrapolar Climate Reversal (ECR). This is the most prominent feature in most tropical and subtropical hydroclimate proxies. The initiation of the ECR coincides with the rapid rise in CO2, in part attributed to upwelling in the Southern Ocean and the near collapse of the Atlantic Meridional Overturning Circulation. We attribute the ECR to upwelling of cold deep waters from the Southern Ocean. This is supported by a variety of proxies showing the incursion of deep Southern Ocean waters into the tropics and subtropics. Regional climate variability across the extropolar regions during the interval previously referred to as the “Mystery Interval” can now be explained in the context of the ECR event.
format	article
author	Yemane Asmerom Victor J. Polyak Matthew S. Lachniet
author_facet	Yemane Asmerom Victor J. Polyak Matthew S. Lachniet
author_sort	Yemane Asmerom
title	Extrapolar climate reversal during the last deglaciation
title_short	Extrapolar climate reversal during the last deglaciation
title_full	Extrapolar climate reversal during the last deglaciation
title_fullStr	Extrapolar climate reversal during the last deglaciation
title_full_unstemmed	Extrapolar climate reversal during the last deglaciation
title_sort	extrapolar climate reversal during the last deglaciation
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/45744b27e0234dc89cf9cffb98160359
work_keys_str_mv	AT yemaneasmerom extrapolarclimatereversalduringthelastdeglaciation AT victorjpolyak extrapolarclimatereversalduringthelastdeglaciation AT matthewslachniet extrapolarclimatereversalduringthelastdeglaciation
_version_	1718395638746447872

Extrapolar climate reversal during the last deglaciation

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