气候变化领域集成服务门户(CCPortal): Better representation of dust can improve climate models with too weak an African monsoon

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DOI	10.5194/acp-21-11423-2021
	Better representation of dust can improve climate models with too weak an African monsoon
	Balkanski Y.; Bonnet R.; Boucher O.; Checa-Garcia R.; Servonnat J.
发表日期	2021
ISSN	1680-7316
起始页码	11423
结束页码	11435
卷号	21 期号:14
英文摘要	The amount of short wave radiation absorbed by dust has remained uncertain. We have developed a more accurate representation of dust absorption that is based on the observed dust mineralogical composition and accounts for very large particles. We analyze the results from two fully coupled climate simulations of 100 years in terms of their simulated precipitation patterns against observations. A striking benefit of the new dust optical and physical properties is that tropical precipitation over the Sahel, tropical North Atlantic and West Indian Ocean are significantly improved compared to observations, without degrading precipitations elsewhere. This alleviates a common persistent bias in Earth system models that exhibit a summer African monsoon that does not reach far enough north. We show that the improvements documented here for the IPSL-CM6IPSL-CM6 is the Earth system model developed at the Institut Pierre-Simon Laplace and described in Boucher et al. (2020). climate model result from both a thermodynamical and dynamical response to dust absorption, which is unrelated to natural variability. Aerosol absorption induces more water vapor advection from the ocean to the Sahel region, thereby providing an added supply of moisture available for precipitation. This work, thus, provides a path towards improving precipitation patterns in these regions by accounting for both physical and optical properties of the aerosol more realistically. © Copyright:
语种	英语
scopus关键词	absorption; atmospheric moisture; climate modeling; dust; mineralogy; monsoon; precipitation (climatology); shortwave radiation; water vapor; Atlantic Ocean; Atlantic Ocean (North); Indian Ocean; Indian Ocean (West)
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/246692
作者单位	Laboratoire des Sciences du Climat et de l'Environnement, CEA-CNRS-UVSQ, IPSL, Gif-sur-Yvette, France; Institut Pierre-Simon Laplace, Sorbonne Universite-CNRS, Paris, France
推荐引用方式 GB/T 7714	Balkanski Y.,Bonnet R.,Boucher O.,et al. Better representation of dust can improve climate models with too weak an African monsoon[J],2021,21(14).
APA	Balkanski Y.,Bonnet R.,Boucher O.,Checa-Garcia R.,&Servonnat J..(2021).Better representation of dust can improve climate models with too weak an African monsoon.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(14).
MLA	Balkanski Y.,et al."Better representation of dust can improve climate models with too weak an African monsoon".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.14(2021).