气候变化领域集成服务门户(CCPortal): Respective impacts of Arctic sea ice decline and increasing greenhouse gases concentration on Sahel precipitation

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DOI	10.1007/s00382-018-4488-5
	Respective impacts of Arctic sea ice decline and increasing greenhouse gases concentration on Sahel precipitation
	Monerie P.-A.; Oudar T.; Sanchez-Gomez E.
发表日期	2019
ISSN	0930-7575
起始页码	5947
结束页码	5964
卷号	52 期号:2020-09-10
英文摘要	The impact of climate change on Sahel precipitation is uncertain and has to be widely documented. Recently, it has been shown that Arctic sea ice loss leverages the global warming effects worldwide, suggesting a potential impact of Arctic sea ice decline on tropical regions. However, defining the specific roles of increasing greenhouse gases (GHG) concentration and declining Arctic sea ice extent on Sahel climate is not straightforward since the former impacts the latter. We avoid this dependency by analysing idealized experiments performed with the CNRM-CM5 coupled model. Results show that the increase in GHG concentration explains most of the Sahel precipitation change. We found that the impact due to Arctic sea ice loss depends on the level of atmospheric GHG concentration. When the GHG concentration is relatively low (values representative of 1980s), then the impact is moderate over the Sahel. However, when the concentration in GHG is levelled up, then Arctic sea ice loss leads to increased Sahel precipitation. In this particular case the ocean-land meridional gradient of temperature strengthens, allowing a more intense monsoon circulation. We linked the non-linearity of Arctic sea ice decline impact with differences in temperature and sea level pressure changes over the North Atlantic Ocean. We argue that the impact of the Arctic sea ice loss will become more relevant with time, in the context of climate change. © 2018, The Author(s).
英文关键词	Arctic sea ice decline; Arctic-tropic teleconnection; Climate Change; CMIP climate models; Sahel precipitation; West African Monsoon
语种	英语
scopus关键词	climate change; climate effect; CMIP; concentration (composition); greenhouse gas; precipitation (climatology); sea ice; teleconnection; Arctic Ocean; Sahel [Sub-Saharan Africa]
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/146326
作者单位	Department of Meteorology, National Centre for Atmospheric Science (NCAS), University of Reading, Reading, United Kingdom; Department of Physics, University of Toronto, Toronto, ON, Canada; CECI CNRS/CERFACS, Toulouse, France
推荐引用方式 GB/T 7714	Monerie P.-A.,Oudar T.,Sanchez-Gomez E.. Respective impacts of Arctic sea ice decline and increasing greenhouse gases concentration on Sahel precipitation[J],2019,52(2020-09-10).
APA	Monerie P.-A.,Oudar T.,&Sanchez-Gomez E..(2019).Respective impacts of Arctic sea ice decline and increasing greenhouse gases concentration on Sahel precipitation.Climate Dynamics,52(2020-09-10).
MLA	Monerie P.-A.,et al."Respective impacts of Arctic sea ice decline and increasing greenhouse gases concentration on Sahel precipitation".Climate Dynamics 52.2020-09-10(2019).