气候变化领域集成服务门户(CCPortal): Roles of sea ice–surface wind feedback in maintaining the glacial Atlantic meridional overturning circulation and climate

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DOI	10.1175/JCLI-D-19-0431.1
	Roles of sea ice–surface wind feedback in maintaining the glacial Atlantic meridional overturning circulation and climate
	Sherriff-Tadano S.; Abe-Ouchi A.
发表日期	2020
ISSN	0894-8755
起始页码	3001
结束页码	3018
卷号	33 期号:8
英文摘要	During glacial periods, climate varies between two contrasting modes, the interstadials and stadials. These climate changes are often associated with drastic reorganizations of the Atlantic meridional overturning circulation (AMOC). Previous studies highlight the important role of sea ice in maintaining contrasting modes of the AMOC through its insulating effect on the oceanic heat flux and the buoyancy flux (sea ice–buoyancy flux feedback); however, the effect of feedback from the atmosphere remains unclear. Here, the effect of sea ice–surface wind interactions over the North Atlantic Ocean on the AMOC is explored. For this purpose, results from comprehensive atmosphere–ocean coupled general circulation models (AOGCMs) are analyzed. Then, sensitivity experiments are conducted with the atmospheric component of the AOGCM. Last, to explore the impact of modifications in surface winds induced by sea ice on the maintenance of the AMOC, partially coupled experiments are conducted with the AOGCMs. Experiments show that the expansion of sea ice associated with a weakening of the AMOC reduces surface winds by suppressing the oceanic heat flux and increasing the atmospheric static stability. This wind anomaly then causes a weakening of the wind-driven ocean salt transport to the northern North Atlantic and maintains the weak AMOC, therefore working as a positive feedback. It is shown that, together with the sea ice–buoyancy flux and sea ice–surface wind feedback, changes in sea ice and oceanic heat flux sustain the contrasting modes of the AMOC. These results may provide useful information for interpreting the differences in the self-sustained internal oscillations of the AMOC produced by recent AOGCMs. © 2020 American Meteorological Society.
英文关键词	Buoyancy; Climate change; Climate models; Feedback; Glacial geology; Heat flux; Sea ice; Atlantic meridional overturning circulations; Atmospheric components; Atmospheric static stability; Buoyancy fluxes; Coupled general circulation models; Internal oscillation; North Atlantic Ocean; Oceanic heat flux; Oceanography; feedback mechanism; general circulation model; heat flux; meridional circulation; sea ice; sea surface; sensitivity analysis; surface wind
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171359
作者单位	Atmosphere and Ocean Research Institute, University of Tokyo, Kashiwa, Japan
推荐引用方式 GB/T 7714	Sherriff-Tadano S.,Abe-Ouchi A.. Roles of sea ice–surface wind feedback in maintaining the glacial Atlantic meridional overturning circulation and climate[J],2020,33(8).
APA	Sherriff-Tadano S.,&Abe-Ouchi A..(2020).Roles of sea ice–surface wind feedback in maintaining the glacial Atlantic meridional overturning circulation and climate.Journal of Climate,33(8).
MLA	Sherriff-Tadano S.,et al."Roles of sea ice–surface wind feedback in maintaining the glacial Atlantic meridional overturning circulation and climate".Journal of Climate 33.8(2020).