globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo1723
论文题名:
Estimated strength of the Atlantic overturning circulation during the last deglaciation
作者: Ritz S.P.; Stocker T.F.; Grimalt J.O.; Menviel L.; Timmermann A.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2013
卷: 6, 期:3
起始页码: 208
结束页码: 212
语种: 英语
Scopus关键词: air temperature ; climate modeling ; cooling ; deep water ; estimation method ; Heinrich event ; Holocene ; last deglaciation ; Last Glacial Maximum ; latitude ; meridional circulation ; protactinium ; proxy climate record ; qualitative analysis ; radiocarbon dating ; reconstruction ; Atlantic Ocean
英文摘要: The Atlantic meridional overturning circulation affects the latitudinal distribution of heat, and is a key component of the climate system. Proxy reconstructions, based on sedimentary 231Pa/230Th ratios and the difference between surface- and deep-water radiocarbon ages, indicate that during the last glacial period, the overturning circulation was reduced during millennial-scale periods of cooling1-5. However, much debate exists over the robustness of these proxies6-8. Here we combine proxy reconstructions of sea surface and air temperatures and a global climate model to quantitatively estimate changes in the strength of the Atlantic meridional overturning circulation during the last glacial period. We find that, relative to the Last Glacial Maximum, the overturning circulation was reduced by approximately 14 Sv during the cold Heinrich event 1. During the Younger Dryas cold event, the overturning circulation was reduced by approximately 12 Sv, relative to the preceding warm interval. These changes are consistent with qualitative estimates of the overturning circulation from sedimentary 231Pa/230Th ratios. In addition, we find that the strength of the overturning circulation during the Last Glacial Maximum and the Holocene epoch are indistinguishable within the uncertainty of the reconstruction. Copyright © 2013 Macmillan Publishers Limited.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106834
Appears in Collections:气候减缓与适应
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作者单位: Climate and Environmental Physics, Physics Institute, University of Bern, Sidlerstr. 5, 3012 Bern, Switzerland; Oeschger Centre for Climate Change Research, University of Bern, 3012 Bern, Switzerland; Department of Environmental Chemistry, Institute of Environmental Assessment and Water Research, Spanish Council for Scientific Research, 08034 Barcelona, Spain; Climate Change Research Centre, Centre of Excellence, University of New SouthWales, Sydney, NSW 2052, Australia; IPRC, University of Hawaii, Honolulu, HI 96822, United States

Recommended Citation:
Ritz S.P.,Stocker T.F.,Grimalt J.O.,et al. Estimated strength of the Atlantic overturning circulation during the last deglaciation[J]. Nature Geoscience,2013-01-01,6(3)
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