DOI: 10.1038/ngeo2558
论文题名: Abrupt changes in the southern extent of North Atlantic Deep Water during Dansgaard-Oeschger events
作者: Gottschalk J. ; Skinner L.C. ; Misra S. ; Waelbroeck C. ; Menviel L. ; Timmermann A.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2015
卷: 8, 期: 12 起始页码: 950
结束页码: 954
语种: 英语
Scopus关键词: benthic foraminifera
; climate conditions
; climate variation
; deep water
; interstadial
; Northern Hemisphere
; subantarctic region
; thermohaline circulation
; Atlantic Ocean
; Atlantic Ocean (North)
; Foraminifera
英文摘要: The glacial climate system transitioned rapidly between cold (stadial) and warm (interstadial) conditions in the Northern Hemisphere. This variability, referred to as Dansgaard-Oeschger variability, is widely believed to arise from perturbations of the Atlantic Meridional Overturning Circulation. Evidence for such changes during the longer Heinrich stadials has been identified, but direct evidence for overturning circulation changes during Dansgaard-Oeschger events has proven elusive. Here we reconstruct bottom water [CO3 2-[ variability from B/Ca ratios of benthic foraminifera and indicators of sedimentary dissolution, and use these reconstructions to infer the flow of northern-sourced deep water to the deep central sub-Antarctic Atlantic Ocean. We find that nearly every Dansgaard-Oeschger interstadial is accompanied by a rapid incursion of North Atlantic Deep Water into the deep South Atlantic. Based on these results and transient climate model simulations, we conclude that North Atlantic stadial-interstadial climate variability was associated with significant Atlantic overturning circulation changes that were rapidly transmitted across the Atlantic. However, by demonstrating the persistent role of Atlantic overturning circulation changes in past abrupt climate variability, our reconstructions of carbonate chemistry further indicate that the carbon cycle response to abrupt climate change was not a simple function of North Atlantic overturning. © 2015 Macmillan Publishers Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106127
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Godwin Laboratory for Palaeoclimate Research, Earth Sciences Department, University of Cambridge, Downing Street, Cambridge, United Kingdom; LSCE, IPSL, UVSQ, Gif-sur-Yvette, France; Climate Change Research Centre, University of New South Wales, Sydney, NSW, Australia; Centre of Excellence for Climate System Science, Sydney, NSW, Australia; International Pacific Research Center, Department of Oceanography, University of Hawaii, Honolulu, United States
Recommended Citation:
Gottschalk J.,Skinner L.C.,Misra S.,et al. Abrupt changes in the southern extent of North Atlantic Deep Water during Dansgaard-Oeschger events[J]. Nature Geoscience,2015-01-01,8(12)