Scopus记录号: 2-s2.0-85060396566
论文题名: The optical characteristics and sources of chromophoric dissolved organic matter (CDOM) in seasonal snow of northwestern China
作者: Zhou Y. ; Wen H. ; Liu J. ; Pu W. ; Chen Q. ; Wang X.
刊名: Cryosphere
ISSN: 19940416
出版年: 2019
卷: 13, 期: 1 起始页码: 157
结束页码: 175
语种: 英语
英文摘要: Chromophoric dissolved organic matter (CDOM) plays an important role in the global carbon cycle and energy budget but is rarely studied in seasonal snow. A field campaign was conducted across northwestern China from January to February 2012, and surface snow samples were collected at 39 sites in Xinjiang and Qinghai provinces. Absorption and fluorescence spectroscopies, along with chemical analysis, were used to investigate the optical characteristics and potential sources of CDOM in seasonal snow. The abundance of CDOM, shown as the absorption coefficient at 280 nm, αCDOM.280/, and the spectral slope from 275 to 295 nm (S275-295/ ranged from 0.15 to 10.57m-1 and 0.0129 to 0.0389 nm-1. The highest average αCDOM.280/ (2:30±0:52m-1/ was found in Qinghai, and the lowest average S275-295 (0:0188±0:0015 nm-1/ indicated that the snow CDOM in this region had a strongly terrestrial characteristic. The lower values of αCDOM.280/ were found at sites located to the north of the Tianshan Mountains and northwestern Xinjiang along the border of China (0:93±0:68m-1 and 0:80±0:62m-1). Parallel factor (PARAFAC) analysis identified three types of fluorophores that were attributed to two humic-like substances (HULIS, C1 and C2) and one proteinlike material (C3). C1 was mainly from soil HULIS, C3 was a type of autochthonously labile organic matter, while the potential sources of C2 were complex, including soil, microbial activity, anthropogenic pollution, and biomass burning. Furthermore, the regional variations of sources for snow CDOM were assessed by analyses of chemical species (e.g., soluble ions), fluorescent components, and air mass backward trajectories combined with satellite-derived active-fire locations. © Author(s) 2019. 资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122689
Appears in Collections: 气候变化事实与影响
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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; School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi'an, 710021, China; Graduate School of Environmental Studies, Nagoya University, Nagoya, 464-8601, Japan
Recommended Citation:
Zhou Y.,Wen H.,Liu J.,et al. The optical characteristics and sources of chromophoric dissolved organic matter (CDOM) in seasonal snow of northwestern China[J]. Cryosphere,2019-01-01,13(1)