气候变化领域集成服务门户(CCPortal): Dynamic and thermodynamic factors controlling increasing summer monsoon rainfall over the West African Sahel

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DOI	10.1007/s00382-018-4394-x
	Dynamic and thermodynamic factors controlling increasing summer monsoon rainfall over the West African Sahel
	Akinsanola A.A.; Zhou W.
发表日期	2019
ISSN	0930-7575
起始页码	4501
结束页码	4514
卷号	52 期号:2020-07-08
英文摘要	The central-eastern Sahel (CES) subregion of West Africa has experienced a significant increasing trend in summer monsoon rainfall during 1980–2012, but the reasons remain unclear. In this study, we employ a moisture budget analysis to assess the controlling mechanisms and to quantify the contributions of different factors to this increasing trend. Results reveal that the majority of the increasing rainfall over the CES is balanced by increased vertical moisture advection. We further decompose the vertical moisture advection term into dynamic, thermodynamic, and nonlinear components. The dynamic component exhibits the largest contribution to the trend, followed by the thermodynamic component. These components are modulated by strong convergence in the middle and lower troposphere and increased near-surface specific humidity from a remote source. Diagnosing changes in vertical moisture advection against the background of global warming deserves more attention when projecting changes in climate at subregional scales, especially in arid and semiarid regions. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	African easterly jet; Moisture budget equation; Precipitation; Tropical easterly jet; Water vapor transport; West African Monsoon
语种	英语
scopus关键词	advection; atmospheric moisture; atmospheric transport; global warming; jet stream; monsoon; rainfall; thermodynamics; water vapor; 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/146416
作者单位	Guy Carpenter Asia-Pacific Climate Impact Centre, School of Energy and Environment, City University of Hong Kong, Hong Kong
推荐引用方式 GB/T 7714	Akinsanola A.A.,Zhou W.. Dynamic and thermodynamic factors controlling increasing summer monsoon rainfall over the West African Sahel[J],2019,52(2020-07-08).
APA	Akinsanola A.A.,&Zhou W..(2019).Dynamic and thermodynamic factors controlling increasing summer monsoon rainfall over the West African Sahel.Climate Dynamics,52(2020-07-08).
MLA	Akinsanola A.A.,et al."Dynamic and thermodynamic factors controlling increasing summer monsoon rainfall over the West African Sahel".Climate Dynamics 52.2020-07-08(2019).