气候变化领域集成服务门户(CCPortal): Gateway-driven weakening of ocean gyres leads to Southern Ocean cooling

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DOI	10.1038/s41467-021-26658-1
	Gateway-driven weakening of ocean gyres leads to Southern Ocean cooling
	Sauermilch I.; Whittaker J.M.; Klocker A.; Munday D.R.; Hochmuth K.; Bijl P.K.; LaCasce J.H.
发表日期	2021
ISSN	2041-1723
卷号	12 期号:1
英文摘要	Declining atmospheric CO2 concentrations are considered the primary driver for the Cenozoic Greenhouse-Icehouse transition, ~34 million years ago. A role for tectonically opening Southern Ocean gateways, initiating the onset of a thermally isolating Antarctic Circumpolar Current, has been disputed as ocean models have not reproduced expected heat transport to the Antarctic coast. Here we use high-resolution ocean simulations with detailed paleobathymetry to demonstrate that tectonics did play a fundamental role in reorganising Southern Ocean circulation patterns and heat transport, consistent with available proxy data. When at least one gateway (Tasmanian or Drake) is shallow (300 m), gyres transport warm waters towards Antarctica. When the second gateway subsides below 300 m, these gyres weaken and cause a dramatic cooling (average of 2–4 °C, up to 5 °C) of Antarctic surface waters whilst the ACC remains weak. Our results demonstrate that tectonic changes are crucial for Southern Ocean climate change and should be carefully considered in constraining long-term climate sensitivity to CO2. © 2021, The Author(s).
语种	英语
scopus关键词	Cenozoic; circulation; climate change; cooling; ocean; tectonics; Antarctic Circumpolar Current; Antarctica; Southern Ocean; Southern Ocean
来源期刊	Nature Communications
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/251311
作者单位	Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, Australia; Department of Earth Sciences, Faculty of Geosciences, Utrecht University, Utrecht, Netherlands; Australian Research Council Centre of Excellence for Climate Extremes, University of Tasmania, Hobart, Australia; British Antarctic Survey, Cambridge, United Kingdom; Alfred Wegener Institute Helmholtz Center for Polar and Marine Research, Bremerhaven, Germany; School of Geography, Geology and the Environment, University of Leicester, Leicester, United Kingdom; Department of Geosciences, University of Oslo, Oslo, Norway
推荐引用方式 GB/T 7714	Sauermilch I.,Whittaker J.M.,Klocker A.,et al. Gateway-driven weakening of ocean gyres leads to Southern Ocean cooling[J],2021,12(1).
APA	Sauermilch I..,Whittaker J.M..,Klocker A..,Munday D.R..,Hochmuth K..,...&LaCasce J.H..(2021).Gateway-driven weakening of ocean gyres leads to Southern Ocean cooling.Nature Communications,12(1).
MLA	Sauermilch I.,et al."Gateway-driven weakening of ocean gyres leads to Southern Ocean cooling".Nature Communications 12.1(2021).