气候变化领域集成服务门户(CCPortal): Temperature domination of AMOC weakening due to freshwater hosing in two GCMs

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DOI	10.1007/s00382-019-04998-5
	Temperature domination of AMOC weakening due to freshwater hosing in two GCMs
	Haskins R.K.; Oliver K.I.C.; Jackson L.C.; Wood R.A.; Drijfhout S.S.
发表日期	2020
ISSN	0930-7575
起始页码	273
结束页码	286
卷号	54 期号:2020-01-02
英文摘要	Anthropogenic climate change is projected to lead to a weakening of the Atlantic meridional overturning circulation (AMOC). One of the mechanisms contributing to this is ice melt leading to a freshening of the North Atlantic Ocean. We use two global climate models to investigate the role of temperature and salinity in the weakening of the AMOC resulting from freshwater forcing. This study finds that freshwater hosing reduces the strength of the AMOC, but in some situations it is not through reduced density from freshening, but a reduction in density from subsurface warming. When the freshwater is mixed down it directly reduces the density of the North Atlantic, weakening the strength of the AMOC. As the AMOC weakens, the mixed layer depth reduces and surface properties are less effectively mixed down. A buoyant surface cap forms, blocking atmospheric fluxes. This leads to the development of a warm anomaly beneath the surface cap, which becomes the primary driver of AMOC weakening. We found that the mean North Atlantic salinity anomaly can be used as a proxy for AMOC weakening because it describes the extent of this surface cap. © 2019, The Author(s).
英文关键词	AMOC; Density; GCM; Hosing; Model; Thermohaline circulation
语种	英语
scopus关键词	air temperature; climate change; freshwater; general circulation model; global climate; meridional circulation; overturn; salinity; thermohaline circulation; Atlantic Ocean; Atlantic Ocean (North)
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/145781
作者单位	University of Southampton, Southampton, United Kingdom; Met Office Hadley Centre, Exeter, United Kingdom
推荐引用方式 GB/T 7714	Haskins R.K.,Oliver K.I.C.,Jackson L.C.,et al. Temperature domination of AMOC weakening due to freshwater hosing in two GCMs[J],2020,54(2020-01-02).
APA	Haskins R.K.,Oliver K.I.C.,Jackson L.C.,Wood R.A.,&Drijfhout S.S..(2020).Temperature domination of AMOC weakening due to freshwater hosing in two GCMs.Climate Dynamics,54(2020-01-02).
MLA	Haskins R.K.,et al."Temperature domination of AMOC weakening due to freshwater hosing in two GCMs".Climate Dynamics 54.2020-01-02(2020).