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DOI	10.1016/j.scitotenv.2018.07.417
	Dissolved organic carbon in snow cover of the Chinese Altai Mountains, Central Asia: Concentrations, sources and light-absorption properties
	Zhang, Yulan; Kang, Shichang; Gao, Tanguang; Schmale, Julia; Liu, Yajun; Zhang, Wei; Guo, Junming; Du, Wentao; Hu, Zhaofu; Cui, Xiaoqing; Sillanpaa, Mika
发表日期	2019
ISSN	0048-9697
EISSN	1879-1026
卷号	647
英文摘要	Dissolved organic carbon (DOC) in snow plays an important role in river ecosystems that are fed by snowmelt water. However, limited knowledge is available on the DOC content in snow of the Chinese Altai Mountains in Central Asia. In this study, DOC in the snow cover of the Kayiertesi river basin, southern slope of Altai Mountains, was investigated during November 2016 to April 2017. The results showed that average concentrations of DOC in the surface snowcover (1.01 +/- 0.52 mgL(-1)) were only a little higher than those in glaciers of the Tibetan Plateau, European Alps, and Alaska, but much higher than in Greenland Ice Sheet. Depth variations of DOC concentrations from snowpack profiles indicated higher values in the surface layer. During the observation period, scavenging efficiency for DOC in snow cover is estimated to be 0.15 +/- 0.10, suggesting that DOC in snow can be affected more by the meltwater during ablation season than during accumulation season. The average mass absorption cross section at 365 nm and the absorption Angstrom exponent of DOC were 0.45 +/- 0.35 m(2) g(-1) and 2.59 +/- 1.03, respectively, with higher values in March and April 2017. Fraction of radiative forcing caused by DOC relative to black carbon accounted for about 10.5%, implying DOC is a non-ignorable light-absorber of solar radiation in snow of the Altai regions. Backward trajectories analysis and aerosol vertical distribution images from satellites showed that DOC in the snow of the Altai Mountains was mainly influenced by air masses from Central Asia, Western Siberia, the Middle East, and some even from Europe. Biomass burning and organic carbon mixed with mineral dust contributed significantly to the DOC concentration. This study highlights the effects of DOC in the snow cover for radiative forcing and the need to study carbon cycling for evaluation of quality of the down-streams ecosystems. (c) 2018 Elsevier B.V. All rights reserved.
关键词	DOC Light-absorption properties Black carbon Snow Altai Mountains
学科领域	Environmental Sciences & Ecology
语种	英语
WOS研究方向	Environmental Sciences
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/112046
作者单位	Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryospher Sci, Lanzhou 730000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Yulan,Kang, Shichang,Gao, Tanguang,et al. Dissolved organic carbon in snow cover of the Chinese Altai Mountains, Central Asia: Concentrations, sources and light-absorption properties[J]. 中国科学院西北生态环境资源研究院,2019,647.
APA	Zhang, Yulan.,Kang, Shichang.,Gao, Tanguang.,Schmale, Julia.,Liu, Yajun.,...&Sillanpaa, Mika.(2019).Dissolved organic carbon in snow cover of the Chinese Altai Mountains, Central Asia: Concentrations, sources and light-absorption properties.SCIENCE OF THE TOTAL ENVIRONMENT,647.
MLA	Zhang, Yulan,et al."Dissolved organic carbon in snow cover of the Chinese Altai Mountains, Central Asia: Concentrations, sources and light-absorption properties".SCIENCE OF THE TOTAL ENVIRONMENT 647(2019).