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	Black carbon-induced snow albedo reduction over the Tibetan Plateau: uncertainties from snow grain shape and aerosol-snow mixing state based on an updated SNICAR model
	He, Cenlin1,2; Flanner, Mark G.3; Chen, Fei2,4; Barlage, Michael2; Liou, Kuo-Nan5,6; Kang, Shichang7,8; Ming, Jing9; Qian, Yun10
刊名	ATMOSPHERIC CHEMISTRY AND PHYSICS
	2018-08-15
卷号	18期号:15页码:11507-11527
ISSN号	1680-7316
DOI	10.5194/acp-18-11507-2018
通讯作者	He, Cenlin(cenlinhe@ucar.edu)
英文摘要	We implement a set of new parameterizations into the widely used Snow, Ice, and Aerosol Radiative (SNICAR) model to account for effects of snow grain shape (spherical vs. nonspherical) and black carbon (BC)-snow mixing state (external vs. internal). We find that nonspherical snow grains lead to higher pure albedo but weaker BC-induced albedo reductions relative to spherical snow grains, while BC-snow internal mixing significantly enhances albedo reductions relative to external mixing. The combination of snow nonsphericity and internal mixing suggests an important interactive effect on BC-induced albedo reduction. Comparisons with observations of clean and BC-contaminated snow albedo show that model simulations accounting for both snow nonsphericity and BC-snow internal mixing perform better than those using the common assumption of spherical snow grains and external mixing. We further apply the updated SNICAR model with comprehensive in situ measurements of BC concentrations in the Tibetan Plateau snow-pack to quantify the present-day (2000-2015) BC-induced snow albedo effects from a regional and seasonal perspective. The BC concentrations show distinct and substantial sub-regional and seasonal variations, with higher values in the non-monsoon season and low altitudes. As a result, the BC-induced regional mean snow albedo reductions and surface radiative effects vary by up to an order of magnitude across different sub-regions and seasons, with values of 0.7-30.7 and 1.4-58.4Wm 2 for BC externally mixed with fresh and aged snow spheres, respectively. The BC radiative effects are further complicated by uncertainty in snow grain shape and BC-snow mixing state. BC-snow internal mixing enhances the mean albedo effects over the plateau by 30-60% relative to external mixing, while nonspherical snow grains decrease the mean albedo effects by up to 31% relative to spherical grains. Based on this study, extensive measurements and improved model characterization of snow grain shape and aerosol-snow mixing state are urgently needed in order to precisely evaluate BC-snow albedo effects.
收录类别	SCI
WOS关键词	LIGHT-ABSORBING IMPURITIES ; OPTICAL-PROPERTIES ; CLIMATE MODELS ; SEASONAL SNOW ; INFRARED WAVELENGTHS ; SIZE DISTRIBUTION ; SPECTRAL ALBEDO ; ANTARCTIC SNOW ; DIRTY SNOW ; 3RD POLE
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
语种	英语
出版者	COPERNICUS GESELLSCHAFT MBH
WOS记录号	WOS:000441652600006
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2557790
专题	寒区旱区环境与工程研究所
通讯作者	He, Cenlin
作者单位	1.Natl Ctr Atmospher Res, Adv Study Program, POB 3000, Boulder, CO 80307 USA 2.Natl Ctr Atmospher Res, Res Applicat Lab, POB 3000, Boulder, CO 80307 USA 3.Univ Michigan, Dept Climate & Space Sci & Engn, Ann Arbor, MI 48109 USA 4.Chinese Acad Meteorol Sci, State Key Lab Severe Weather, Beijing, Peoples R China 5.Univ Calif Los Angeles, Joint Inst Reg Earth Syst Sci & Engn, Los Angeles, CA USA 6.Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA USA 7.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryospher Sci, Lanzhou, Gansu, Peoples R China 8.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China 9.Max Planck Inst Chem, Multiphase Chem Dept, Mainz, Germany 10.Pacific Northwest Natl Lab, Atmospher Sci & Global Change Div, Richland, WA 99352 USA
推荐引用方式 GB/T 7714	He, Cenlin,Flanner, Mark G.,Chen, Fei,et al. Black carbon-induced snow albedo reduction over the Tibetan Plateau: uncertainties from snow grain shape and aerosol-snow mixing state based on an updated SNICAR model[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2018,18(15):11507-11527.
APA	He, Cenlin.,Flanner, Mark G..,Chen, Fei.,Barlage, Michael.,Liou, Kuo-Nan.,...&Qian, Yun.(2018).Black carbon-induced snow albedo reduction over the Tibetan Plateau: uncertainties from snow grain shape and aerosol-snow mixing state based on an updated SNICAR model.ATMOSPHERIC CHEMISTRY AND PHYSICS,18(15),11507-11527.
MLA	He, Cenlin,et al."Black carbon-induced snow albedo reduction over the Tibetan Plateau: uncertainties from snow grain shape and aerosol-snow mixing state based on an updated SNICAR model".ATMOSPHERIC CHEMISTRY AND PHYSICS 18.15(2018):11507-11527.

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