DOI: 10.1002/2014GL062512
论文题名: Atlantic Ocean circulation changes preceded millennial tropical South America rainfall events during the last glacial
作者: Burckel P. ; Waelbroeck C. ; Gherardi J.M. ; Pichat S. ; Arz H. ; Lippold J. ; Dokken T. ; Thil F.
刊名: Geophysical Research Letters
ISSN: 0094-9028
EISSN: 1944-8759
出版年: 2015
卷: 42, 期: 2 起始页码: 411
结束页码: 418
语种: 英语
英文关键词: AMOC
; Dansgaard-Oeschger stadials
; Heinrich stadials
; ITCZ
; Pa/Th
Scopus关键词: Glacial geology
; Precipitation (meteorology)
; Rain
; Tropics
; AMOC
; Atlantic meridional overturning circulations
; Dansgaard-Oeschger stadials
; Heinrich stadials
; ITCZ
; Last glacial period
; Precipitation events
; Western tropical atlantic
; Oceanography
; Heinrich event
; Last Glacial
; oceanic circulation
; precipitation (climatology)
; rainfall
; sediment core
; tropical meteorology
; Atlantic Ocean
; Atlantic Ocean (Tropical)
; South America
英文摘要: 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. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84923611681&doi=10.1002%2f2014GL062512&partnerID=40&md5=c9dc734c5bf45a9d6def18726562626e
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8644
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: LSCE/IPSL, Laboratoire CNRS-CEA-UVSQ, Gif sur Yvette, France
Recommended Citation:
Burckel P.,Waelbroeck C.,Gherardi J.M.,et al. Atlantic Ocean circulation changes preceded millennial tropical South America rainfall events during the last glacial[J]. Geophysical Research Letters,2015-01-01,42(2).