气候变化领域集成服务门户(CCPortal): Decadal Atlantic Meridional Overturning Circulation slowing events in a climate model

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DOI	10.1007/s00382-019-04772-7
	Decadal Atlantic Meridional Overturning Circulation slowing events in a climate model
	Latif M.; Park T.; Park W.
发表日期	2019
ISSN	0930-7575
起始页码	1111
结束页码	1124
卷号	53 期号:2020-01-02
英文摘要	There is a controversy about the origin of the recent decadal Atlantic Meridional Overturning Circulation (AMOC) slowing observed at 26.5°N and concurrent sea surface temperature cooling in the central and eastern mid-latitude North Atlantic. We investigate decadal AMOC slowing events simulated in a multi-millennial preindustrial control integration of the Kiel Climate Model (KCM), providing an estimate of internal AMOC variability. Preindustrial control integrations of 15 models participating in the Coupled Model Intercomparison Project phase 5 also are investigated, as well as historical simulations with them providing estimates of AMOC variability during 1856–2005. It is shown that the recent decadal AMOC decline is still within the range of the models’ internal AMOC variability and thus could be of natural origin. In this case, the decline would represent an extreme realization of internal variability provided the climate models yield realistic levels of AMOC variability. The model results suggest that internal decadal AMOC variability is large, requiring multi-decadal observational records to detect an anthropogenic AMOC signal with high confidence. When analyzing the strongest decadal AMOC slowing events in the KCM, which have amplitudes similar to or larger than the recently observed decadal AMOC decline, the following composite picture emerges: a very strong decadal AMOC decline is preceded by a decadal rise in atmospheric surface pressure over large parts of the mid-latitude North Atlantic. The change in low-level atmospheric circulation drives reduced oceanic heat loss over and diminished upper-ocean salt content in the Labrador Sea. In response, oceanic deep convection and subsequently the AMOC and northward oceanic heat transport weaken, and anomalously cold sea surface temperatures develop in the central and eastern mid-latitude North Atlantic. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
语种	英语
scopus关键词	climate modeling; decadal variation; heat transfer; meridional circulation; oceanic convection; sea surface temperature; Atlantic Ocean; Atlantic Ocean (North); Labrador Sea
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/146153
作者单位	GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany; Excellence Cluster “Future Ocean”, Kiel University, Kiel, Germany; Korea Polar Research Institute, Incheon, South Korea
推荐引用方式 GB/T 7714	Latif M.,Park T.,Park W.. Decadal Atlantic Meridional Overturning Circulation slowing events in a climate model[J],2019,53(2020-01-02).
APA	Latif M.,Park T.,&Park W..(2019).Decadal Atlantic Meridional Overturning Circulation slowing events in a climate model.Climate Dynamics,53(2020-01-02).
MLA	Latif M.,et al."Decadal Atlantic Meridional Overturning Circulation slowing events in a climate model".Climate Dynamics 53.2020-01-02(2019).