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Provedor de dados:  ArchiMer
País:  France
Título:  Atlantic Ocean circulation changes preceded millennial tropical South America rainfall events during the last glacial
Autores:  Burckel, Pierre
Waelbroeck, Claire
Gherardi, Jeanne Marie
Pichat, Sylvain
Arz, Helge
Lippold, Joerg
Dokken, Trond
Thil, Francois
Data:  2015-01
Ano:  2015
Palavras-chave:  Heinrich stadials
Dansgaard-Oeschger stadials
Resumo:  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.
Tipo:  Text
Idioma:  Inglês

Editor:  Amer Geophysical Union
Formato:  application/pdf
Fonte:  Geophysical Research Letters (0094-8276) (Amer Geophysical Union), 2015-01 , Vol. 42 , N. 2 , P. 411-418
Direitos:  2015. American Geophysical Union. All Rights Reserved.


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