气候变化领域集成服务门户(CCPortal): A salty deep ocean as a prerequisite for glacial termination

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DOI	10.1038/s41561-021-00857-3
	A salty deep ocean as a prerequisite for glacial termination
	Knorr G.; Barker S.; Zhang X.; Lohmann G.; Gong X.; Gierz P.; Stepanek C.; Stap L.B.
发表日期	2021
ISSN	1752-0894
卷号	14 期号:12
英文摘要	Deglacial transitions of the middle to late Pleistocene (terminations) are linked to gradual changes in insolation accompanied by abrupt shifts in ocean circulation. However, the reason these deglacial abrupt events are so special compared with their sub-glacial-maximum analogues, in particular with respect to the exaggerated warming observed across Antarctica, remains unclear. Here we show that an increase in the relative importance of salt versus temperature stratification in the glacial deep South Atlantic decreases the potential cooling effect of waters that may be upwelled in response to abrupt perturbations in ocean circulation, as compared with sub-glacial-maximum conditions. Using a comprehensive coupled atmosphere–ocean general circulation model, we then demonstrate that an increase in deep-ocean salinity stratification stabilizes relatively warm waters in the glacial deep ocean, which amplifies the high southern latitude surface ocean temperature response to an abrupt weakening of the Atlantic meridional overturning circulation during deglaciation. The mechanism can produce a doubling in the net rate of warming across Antarctica on a multicentennial timescale when starting from full glacial conditions (as compared with interglacial or subglacial conditions) and therefore helps to explain the large magnitude and rapidity of glacial terminations during the late Quaternary. © 2021, The Author(s).
语种	英语
scopus关键词	cooling; glaciation; interglacial; Pleistocene; stratification; Antarctica; Atlantic Ocean; Atlantic Ocean (South)
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/250820
作者单位	Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany; School of Earth and Environmental Sciences, Cardiff University, Cardiff, United Kingdom; Group of Alpine Paleoecology and Human Adaptation (ALPHA), State Key Laboratory of Tibetan Plateau Earth System, Resources and Environment (TPESRE), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, China; Key Laboratory of Western China’s Environmental Systems (Ministry of Education), College of Earth and Environmental Science, Lanzhou University, Lanzhou, China; MARUM-Center for Marine Environmental Sciences, University of Bremen, Bremen, Germany; Hubei Key Laboratory of Marine Geological Resources, China University of Geosciences, Wuhan, China; Institute for Marine and Atmospheric Research Utrecht, Utrecht University, Utrecht, Netherlands
推荐引用方式 GB/T 7714	Knorr G.,Barker S.,Zhang X.,et al. A salty deep ocean as a prerequisite for glacial termination[J],2021,14(12).
APA	Knorr G..,Barker S..,Zhang X..,Lohmann G..,Gong X..,...&Stap L.B..(2021).A salty deep ocean as a prerequisite for glacial termination.Nature Geoscience,14(12).
MLA	Knorr G.,et al."A salty deep ocean as a prerequisite for glacial termination".Nature Geoscience 14.12(2021).