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, Gregor; Barker, Stephen; Zhang, Xu; Lohmann, Gerrit; Gong, Xun; Gierz, Paul; Stepanek, Christian; Stap, Lennert B.
通讯作者	Knorr, G (通讯作者)
发表日期	2021
ISSN	1752-0894
EISSN	1752-0908
起始页码	930
结束页码	+
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. Heat stored in the deep ocean due to salinity stratification contributed to rapid Antarctic warming during middle and late Pleistocene glacial terminations, according to coupled atmosphere-ocean general circulation model simulations.
关键词	MERIDIONAL OVERTURNING CIRCULATION EARTH SYSTEM MODEL ANTARCTIC ICE-SHEET SOUTHERN-OCEAN ATMOSPHERIC CO2 ATLANTIC-OCEAN CLIMATE-CHANGE COUPLED MODEL BOTTOM WATER CARBON-CYCLE
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000725987700001
来源期刊	NATURE GEOSCIENCE
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260522
推荐引用方式 GB/T 7714	Knorr, Gregor,Barker, Stephen,Zhang, Xu,et al. A salty deep ocean as a prerequisite for glacial termination[J]. 中国科学院青藏高原研究所,2021,14(12).
APA	Knorr, Gregor.,Barker, Stephen.,Zhang, Xu.,Lohmann, Gerrit.,Gong, Xun.,...&Stap, Lennert B..(2021).A salty deep ocean as a prerequisite for glacial termination.NATURE GEOSCIENCE,14(12).
MLA	Knorr, Gregor,et al."A salty deep ocean as a prerequisite for glacial termination".NATURE GEOSCIENCE 14.12(2021).