globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2580
论文题名:
The spatial extent and dynamics of the Antarctic Cold Reversal
作者: Pedro J.B.; Bostock H.C.; Bitz C.M.; He F.; Vandergoes M.J.; Steig E.J.; Chase B.M.; Krause C.E.; Rasmussen S.O.; Markle B.R.; Cortese G.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2016
卷: 9, 期:1
起始页码: 51
结束页码: 55
语种: 英语
Scopus关键词: Allerod ; atmosphere-ocean system ; Bolling ; climate modeling ; climate variation ; cooling ; global climate ; Hadley cell ; heat transfer ; ice core ; last deglaciation ; paleoclimate ; Southern Hemisphere ; Antarctica ; Atlantic Ocean ; Atlantic Ocean (North) ; Atlantic Ocean (South)
英文摘要: Antarctic ice cores show that a millennial-scale cooling event, the Antarctic Cold Reversal (14,700 to 13,000 years ago), interrupted the last deglaciation. The Antarctic Cold Reversal coincides with the Bølling-Allerød warm stage in the North Atlantic, providing an example of the inter-hemispheric coupling of abrupt climate change generally referred to as the bipolar seesaw. However, the ocean-atmosphere dynamics governing this coupling are debated. Here we examine the extent and expression of the Antarctic Cold Reversal in the Southern Hemisphere using a synthesis of 84 palaeoclimate records. We find that the cooling is strongest in the South Atlantic and all regions south of 40° S. At the same time, the terrestrial tropics and subtropics show abrupt hydrologic variations that are significantly correlated with North Atlantic climate changes. Our transient global climate model simulations indicate that the observed extent of Antarctic Cold Reversal cooling can be explained by enhanced northward ocean heat transport from the South to North Atlantic, amplified by the expansion and thickening of sea ice in the Southern Ocean. The hydrologic variations at lower latitudes result from an opposing enhancement of southward heat transport in the atmosphere mediated by the Hadley circulation. Our findings reconcile previous arguments about the relative dominance of ocean and atmospheric heat transports in inter-hemispheric coupling, demonstrating that the spatial pattern of past millennial-scale climate change reflects the superposition of both. © 2015 Macmillan Publishers Limited. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106098
Appears in Collections:气候减缓与适应
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作者单位: Centre for Ice and Climate, Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark; National Institute of Water and Atmospheric Research, Wellington, New Zealand; Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States; Center for Climatic Research, Nelson Institute for Environmental Studies, University of Wisconsin-Madison, Madison, WI, United States; College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, United States; GNS Science, Lower Hutt, New Zealand; Quaternary Research Center, Department of Earth and Space Sciences, University of Washington, Seattle, WA, United States; Centre National de la Recherche Scientifique (CNRS), Institut des Sciences de l'Evolution de Montpellier, Montpellier, France; Research School of Earth Sciences, Australian National University, Canberra, ACT, Australia

Recommended Citation:
Pedro J.B.,Bostock H.C.,Bitz C.M.,et al. The spatial extent and dynamics of the Antarctic Cold Reversal[J]. Nature Geoscience,2016-01-01,9(1)
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