气候变化领域集成服务门户(CCPortal): Enhanced light absorption and reduced snow albedo due to internally mixed mineral dust in grains of snow

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DOI	10.5194/acp-21-6035-2021
	Enhanced light absorption and reduced snow albedo due to internally mixed mineral dust in grains of snow
	Shi T.; Cui J.; Chen Y.; Zhou Y.; Pu W.; Xu X.; Chen Q.; Zhang X.; Wang X.
发表日期	2021
ISSN	1680-7316
起始页码	6035
结束页码	6051
卷号	21 期号:8
英文摘要	Mineral dust is a major light-Absorbing aerosol, which can significantly reduce snow albedo and accelerate snow/glacier melting via wet and dry deposition on snow. In this study, three scenarios of internal mixing of dust in ice grains were analyzed theoretically by combining asymptotic radiative transfer theory and (core-shell) Mie theory to evaluate the effects on absorption coefficient and albedo of the semi-infinite snowpack consisting of spherical snow grains. In general, snow albedo was substantially reduced at wavelengths of 1:0 um by internal dust-snow mixing, with stronger reductions at higher dust concentrations and larger snow grain sizes. Moreover, calculations showed that a nonuniform distribution of dust in snow grains can lead to significant differences in the values of the absorption coefficient and albedo of dust-contaminated snowpack at visible wavelengths relative to a uniform dust distribution in snow grains. Finally, using comprehensive in situ measurements across the Northern Hemisphere, we found that broadband snow albedo was further reduced by 5.2% and 9.1% due to the effects of internal dust-snow mixing on the Tibetan Plateau and North American mountains. This was higher than the reduction in snow albedo caused by black carbon in snow over most North American and Arctic regions. Our results suggest that significant dust-snow internal mixing is important for the melting and retreat of Tibetan glaciers and North American mountain snowpack. © 2021 Copernicus GmbH. All rights reserved.
语种	英语
scopus关键词	absorption coefficient; albedo; light; Mie theory; mineral dust; mixing; radiative transfer; snow; snowpack; China; North America; 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/246957
作者单位	Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, College of Atmospheric Sciences, Lanzhou University, Lanzhou, 730000, China; College of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu, 610225, China; Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, 130102, China; Institute of Surface-Earth System Science, Tianjin University, Tianjin, 300072, China
推荐引用方式 GB/T 7714	Shi T.,Cui J.,Chen Y.,et al. Enhanced light absorption and reduced snow albedo due to internally mixed mineral dust in grains of snow[J],2021,21(8).
APA	Shi T..,Cui J..,Chen Y..,Zhou Y..,Pu W..,...&Wang X..(2021).Enhanced light absorption and reduced snow albedo due to internally mixed mineral dust in grains of snow.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(8).
MLA	Shi T.,et al."Enhanced light absorption and reduced snow albedo due to internally mixed mineral dust in grains of snow".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.8(2021).