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Atlantic Ocean circulation changes preceded millennial tropical South America rainfall events during the last glacial

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During the last glacial period, Greenland's climate shifted between cold (stadial) and warm (interstadial) phases that were accompanied by ocean circulation changes characterized by reduced Atlantic Meridional Overturning Circulation (AMOC) during stadials. Here we present new data from the wes...

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Main Authors: Burckel, Pierre (Author) , Waelbroeck, Claire (Author) , Gherardi, Jeanne Marie (Author) , Pichat, Sylvain (Author) , Arz, Helge Wolfgang (Author) , Lippold, Jörg (Author) , Dokken, Trond (Author) , Thil, François (Author)
Format: Article (Journal)
Language:English
Published: 16 Jan. 2015
In: Geophysical research letters
Year: 2015, Volume: 42, Issue: 2, Pages: 411-418
ISSN:1944-8007
DOI:10.1002/2014GL062512
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1002/2014GL062512
Verlag, lizenzpflichtig, Volltext: https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1002/2014GL062512
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Author Notes:Pierre Burckel, Claire Waelbroeck, Jeanne Marie Gherardi, Sylvain Pichat, Helge Arz, Joerg Lippold, Trond Dokken, and François Thil
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Summary:During the last glacial period, Greenland's climate shifted between cold (stadial) and warm (interstadial) phases that were accompanied by ocean circulation changes characterized by reduced Atlantic Meridional Overturning Circulation (AMOC) during stadials. Here we present new data from the western tropical Atlantic demonstrating that AMOC slowdowns preceded some of the large South American rainfall events that took place during stadials. Based on 231Pa/230Th and Ti/Ca measurements in the same sediment core, we determine that the AMOC started to slowdown 1420 ± 250 and 690 ± 180 (1σ) years before the onset of two large precipitation events associated with Heinrich stadials. Our results bring unprecedented evidence that AMOC changes could be at the origin of the large precipitation events observed in tropical South America during Heinrich stadials. In addition, we propose a mechanism explaining the differences in the extent and timing of AMOC slowdowns associated with shorter and longer stadials.
Item Description:Gesehen am 28.07.2021
Physical Description:Online Resource
ISSN:1944-8007
DOI:10.1002/2014GL062512

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