DOI: 10.5194/cp-12-2061-2016
Scopus记录号: 2-s2.0-84994731774
论文题名: Changes in the geometry and strength of the Atlantic meridional overturning circulation during the last glacial (20-50 ka)
作者: Burckel P. ; Waelbroeck C. ; Luo Y. ; Roche D.M. ; Pichat S. ; Jaccard S.L. ; Gherardi J. ; Govin A. ; Lippold J. ; Thil F.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2016
卷: 12, 期: 11 起始页码: 2061
结束页码: 2075
语种: 英语
英文摘要: We reconstruct the geometry and strength of the Atlantic meridional overturning circulation during the Heinrich stadial 2 and three Greenland interstadials of the 20-50 ka period based on the comparison of new and published sedimentary 231Pa/230Th data with simulated sedimentary 231Pa/230Th. We show that the deep Atlantic circulation during these interstadials was very different from that of the Holocene. Northern-sourced waters likely circulated above 2500 m depth, with a flow rate lower than that of the present-day North Atlantic deep water (NADW). Southern-sourced deep waters most probably flowed northwards below 4000 m depth into the North Atlantic basin and then southwards as a return flow between 2500 and 4000 m depth. The flow rate of this southern-sourced deep water was likely larger than that of the modern Antarctic bottom water (AABW). Our results further show that during Heinrich stadial 2, the deep Atlantic was probably directly affected by a southern-sourced water mass below 2500 m depth, while a slow, southward-flowing water mass originating from the North Atlantic likely influenced depths between 1500 and 2500 m down to the equator. © Author(s) 2016. 资助项目: ERC, European Research Council
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/48963
Appears in Collections: 气候变化与战略
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Recommended Citation:
Burckel P.,Waelbroeck C.,Luo Y.,et al. Changes in the geometry and strength of the Atlantic meridional overturning circulation during the last glacial (20-50 ka)[J]. Climate of the Past,2016-01-01,12(11)