气候变化领域集成服务门户(CCPortal): Snow-darkening versus direct radiative effects of mineral dust aerosol on the Indian summer monsoon onset: Role of temperature change over dust sources

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DOI	10.5194/acp-19-1605-2019
	Snow-darkening versus direct radiative effects of mineral dust aerosol on the Indian summer monsoon onset: Role of temperature change over dust sources
	Shi Z.; Xie X.; Li X.; Yang L.; Xie X.; Lei J.; Sha Y.; Liu X.
发表日期	2019
ISSN	16807316
起始页码	1605
结束页码	1612
卷号	19 期号:3
英文摘要	Atmospheric absorptive aerosols exert complicated effects on the climate system, two of which are through their direct radiative forcing and snow-darkening forcing. Compared to black carbon, the snow-darkening effect of dust on climate has been scarcely explored till now. When depositing in snow, dust can reduce the albedo of snow by darkening it and increasing the snowmelt. In this study, the snow-darkening effect of dust, as well as the direct radiative effect, on the Indian summer monsoon are evaluated by atmospheric general circulation model experiments. The results show that the snow-darkening and direct radiative forcing of dust both have significant impacts on the onset of the Indian monsoon, but they are distinctly opposite. The snow-darkening effect of dust weakens the Indian monsoon precipitation during May and June, opposite to black carbon. The surface temperature over central Asia and the western Tibetan Plateau becomes warmer due to the dust-induced decrease in snow cover, which leads to a local low-level cyclonic anomaly as well as an anticyclonic anomaly over the Indian subcontinent and Arabian Sea. This circulation pattern allows air currents penetrating into the Indian subcontinent more from central Asia but less from the Indian Ocean. In contrast, the direct radiative forcing of dust warms the low troposphere over the Arabian Peninsula, which intensifies moisture convergence and precipitation over the Indian monsoon region. The upper tropospheric atmospheric circulation over Asia is also sensitive to both effects. Compared to previous studies which emphasized the temperature over the Tibetan Plateau, our results further highlight an important role of surface/low tropospheric temperature changes over dust source areas, which can also significantly modify the response of summer monsoon. Thus, links between the climatic impact of dust and complicated thermal conditions over Asia are of importance and need to be clarified accurately. © 2019 Author(s).
语种	英语
scopus关键词	aerosol; black carbon; dust; monsoon; radiative forcing; snowmelt; summer; surface temperature; temperature anomaly; troposphere; Arabian Sea; China; Indian Ocean; Indian Ocean; Qinghai-Xizang Plateau
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/144662
作者单位	State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710061, China; Center for Excellence in Quaternary Science and Global Change, Chinese Academy of Sciences, Xi'an, 710061, China; Open Studio for Oceanic-Continental Climate and Environment Changes, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
推荐引用方式 GB/T 7714	Shi Z.,Xie X.,Li X.,et al. Snow-darkening versus direct radiative effects of mineral dust aerosol on the Indian summer monsoon onset: Role of temperature change over dust sources[J],2019,19(3).
APA	Shi Z..,Xie X..,Li X..,Yang L..,Xie X..,...&Liu X..(2019).Snow-darkening versus direct radiative effects of mineral dust aerosol on the Indian summer monsoon onset: Role of temperature change over dust sources.Atmospheric Chemistry and Physics,19(3).
MLA	Shi Z.,et al."Snow-darkening versus direct radiative effects of mineral dust aerosol on the Indian summer monsoon onset: Role of temperature change over dust sources".Atmospheric Chemistry and Physics 19.3(2019).