Radiative feedbacks of dust in snow over eastern Asia in CAM4-BAM

doi:10.5194/acp-18-12683-2018

	Radiative feedbacks of dust in snow over eastern Asia in CAM4-BAM
	Wang, Hongli 3; Zhao, Tianliang 2; Liu, Yangang 1; Xie, Xiaoning 6; Liu, Xiaodong 5,6; Che, Huizheng 4; Xie, Xiaoxun 6; Li, Xinzhou 6; Shi, Zhengguo 6
刊名	ATMOSPHERIC CHEMISTRY AND PHYSICS
	2018-08-31
卷号	18 期号:17 页码:12683-12698
DOI	10.5194/acp-18-12683-2018
文献子类	Article
英文摘要	Dust in snow on the Tibetan Plateau (TP) could reduce the visible snow albedo by changing surface optical properties and removing the snow cover through increased snowmelt, which leads to a significant positive radiative forcing and remarkably alters the regional energy balance and the eastern Asian climate system. This study extends our previous investigation in dust-radiation interactions to investigate the dust-in-snow radiative forcing (SRF) and its feedbacks on the regional climate and the dust cycle over eastern Asia through the use of the Community Atmosphere Model version 4 with a Bulk Aerosol Model parameterizations of the dust size distribution (CAM4-BAM). Our results show that SRF increases the eastern Asian dust emissions significantly by 13.7 % in the spring, countering a 7.6 % decrease in the regional emissions by the dust direct radiative forcing (DRF). SRF also remarkably affects the whole dust cycle, including transport and deposition of dust aerosols over eastern Asia. The simulations indicate an increase in dust emissions of 5.1 %, due to the combined effect of DRF and SRF. Further analysis reveals that these results are mainly due to the regional climatic feedbacks induced by SRF over eastern Asia. By reducing the snow albedo over the TP, the dust in snow mainly warms the TP and influences its thermal effects by increasing the surface sensible and latent heat flux, which in turn increases the aridity and westerly winds over northwestern China and affects the regional dust cycle. Additionally, the dust in snow also accelerates the snow-melting process, reduces the snow cover and then expands the eastern Asian dust source region, which results in increasing the regional dust emissions. Hence, a significant feature of SRF on the TP is the creation of a positive feedback loop that affects the dust cycle over eastern Asia.
WOS关键词	LIGHT-ABSORBING IMPURITIES ; TRANS-PACIFIC TRANSPORT ; TIBETAN PLATEAU ; BLACK CARBON ; CLIMATE MODELS ; GRAIN SHAPE ; SIZE DISTRIBUTION ; HYDROLOGICAL CYCLE ; OPTICAL-PROPERTIES ; REGIONAL CLIMATE
WOS研究方向	Meteorology & Atmospheric Sciences
语种	英语
WOS记录号	WOS:000443279800004
内容类型	期刊论文
源URL	[http://ir.ieecas.cn/handle/361006/5338]
专题	地球环境研究所_古环境研究室
作者单位	1.Brookhaven Natl Lab, Environm & Climate Sci Dept, Upton, NY 11973 USA 2.Nanjing Univ Sci Informat & Technol, Key Lab Aerosol Cloud Precipitat, China Meteorol Adm, Nanjing 210044, Jiangsu, Peoples R China 3.Shaanxi Radio & TV Univ, Xian 710119, Shaanxi, Peoples R China 4.Chinese Acad Meteorol Sci, Inst Atmospher Composit, Key Lab Atmospher Chem, CMA, Beijing 100081, Peoples R China 5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 6.Chinese Acad Sci, Inst Earth Environm, SKLLQG, Xian 710061, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Wang, Hongli,Zhao, Tianliang,Liu, Yangang,et al. Radiative feedbacks of dust in snow over eastern Asia in CAM4-BAM[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2018,18(17):12683-12698.
APA	Wang, Hongli.,Zhao, Tianliang.,Liu, Yangang.,Xie, Xiaoning.,Liu, Xiaodong.,...&Shi, Zhengguo.(2018).Radiative feedbacks of dust in snow over eastern Asia in CAM4-BAM.ATMOSPHERIC CHEMISTRY AND PHYSICS,18(17),12683-12698.
MLA	Wang, Hongli,et al."Radiative feedbacks of dust in snow over eastern Asia in CAM4-BAM".ATMOSPHERIC CHEMISTRY AND PHYSICS 18.17(2018):12683-12698.