气候变化领域集成服务门户(CCPortal): Coupling of the Subpolar Gyre and the Overturning Circulation During Abrupt Glacial Climate Transitions

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DOI	10.1029/2020GL090361
	Coupling of the Subpolar Gyre and the Overturning Circulation During Abrupt Glacial Climate Transitions
	Klockmann M.; Mikolajewicz U.; Kleppin H.; Marotzke J.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:21
英文摘要	We present a mechanism for self-sustained ocean circulation changes that cause abrupt temperature changes over Greenland in a multimillennial climate model simulation with glacial CO2 concentrations representative of Marine Isotope Stage 3. The Atlantic meridional overturning circulation (AMOC) and the subpolar gyre (SPG) oscillate on millennial time scales. When the AMOC is strong, the SPG is weak and contracted; when the AMOC is weak, the SPG is strong and extensive. The coupling between the two systems via wind-driven and density-driven feedbacks is key to maintaining the oscillations. The SPG controls the transport of heat and salt into the deep-water formation sites and thus controls the AMOC strength. The strength and location of the deep-water formation affect the density-driven part of the SPG and thus control the mean strength and extent of the SPG. This mechanism supports the hypothesis that coupled ocean-ice-atmosphere interactions could have triggered abrupt glacial climate change. ©2020. The Authors.
英文关键词	Climate change; Climate models; Glacial geology; Atlantic meridional overturning circulations; Climate model simulations; CO2 concentration; Deep-water formation; Marine isotope stages; Overturning circulation; Temperature changes; Transport of heat; Oceanography; atmosphere-ocean coupling; climate change; climate modeling; deep water formation; gyre; ice-ocean interaction; meridional circulation; oceanic circulation; temperature gradient; Arctic; Greenland
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169521
作者单位	Max Planck Institute for Meteorology, Hamburg, Germany; Institute of Coastal Research, Helmholtz-Zentrum Geesthacht, Geesthacht, Germany; MARUM, Bremen, Germany
推荐引用方式 GB/T 7714	Klockmann M.,Mikolajewicz U.,Kleppin H.,et al. Coupling of the Subpolar Gyre and the Overturning Circulation During Abrupt Glacial Climate Transitions[J],2020,47(21).
APA	Klockmann M.,Mikolajewicz U.,Kleppin H.,&Marotzke J..(2020).Coupling of the Subpolar Gyre and the Overturning Circulation During Abrupt Glacial Climate Transitions.Geophysical Research Letters,47(21).
MLA	Klockmann M.,et al."Coupling of the Subpolar Gyre and the Overturning Circulation During Abrupt Glacial Climate Transitions".Geophysical Research Letters 47.21(2020).