气候变化领域集成服务门户(CCPortal): West African Monsoon: current state and future projections in a high-resolution AGCM

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DOI	10.1007/s00382-018-4522-7
	West African Monsoon: current state and future projections in a high-resolution AGCM
	Raj J.; Bangalath H.K.; Stenchikov G.
发表日期	2019
ISSN	0930-7575
起始页码	6441
结束页码	6461
卷号	52 期号:11
英文摘要	The West African Monsoon (WAM) involves the interaction of multi-scale processes ranging from planetary to cumulus scales, which makes it challenging for coarse resolution General Circulation Models to accurately simulate WAM. The present study evaluates the ability of the high-resolution (∼ 25 km) Atmospheric General Circulation Model HiRAM to simulate the WAM and to analyze its future projections by the end of the 21st century. For the historical period, two AMIP-type simulations were conducted, one forced with observed SST from Hadley Center Sea Ice and Sea Surface Temperature dataset and the other forced with SST from the coarse resolution Earth System Model (ESM2M), which is the parent model of HiRAM, i.e. both models have the same dynamical core and similar physical parameterizations. The future projection, using the Representative Concentration Pathway 8.5 and SST from ESM2M is also conducted. A process-based evaluation is carried out to elucidate HiRAM’s ability to represent the key processes and multiscale dynamic features those define the WAM circulation. Compared to ESM2M, HiRAM better represents most of the key circulation elements at different scales, and thus more accurately represents the intensity and spatial distribution of the WAM rainfall. The position of the African easterly jet is considerably improved in HiRAM simulations, leading to the improved positioning of the WAM rainbelt and the two-cell structure of convection. The future projection of the WAM exhibits warming over the entire domain, decreasing precipitation over the southern Sahel, and increase of precipitation over the western Sahara. © 2018, The Author(s).
英文关键词	GFDL HiRAM; High-resolution AGCM; West African Monsoon
语种	英语
scopus关键词	atmospheric general circulation model; future prospect; monsoon; precipitation (climatology); rainfall; sea ice; sea surface temperature; spatial distribution; Sahara; 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/146263
作者单位	Physical Science and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
推荐引用方式 GB/T 7714	Raj J.,Bangalath H.K.,Stenchikov G.. West African Monsoon: current state and future projections in a high-resolution AGCM[J],2019,52(11).
APA	Raj J.,Bangalath H.K.,&Stenchikov G..(2019).West African Monsoon: current state and future projections in a high-resolution AGCM.Climate Dynamics,52(11).
MLA	Raj J.,et al."West African Monsoon: current state and future projections in a high-resolution AGCM".Climate Dynamics 52.11(2019).