globalchange  > 影响、适应和脆弱性
DOI: 10.5194/tc-10-2611-2016
Scopus记录号: 2-s2.0-84995487754
论文题名:
Concentration, sources and light absorption characteristics of dissolved organic carbon on a medium-sized valley glacier, northern Tibetan Plateau
作者: Yan F; , Kang S; , Li C; , Zhang Y; , Qin X; , Li Y; , Zhang X; , Hu Z; , Chen P; , Li X; , Qu B; , Sillanpää M
刊名: Cryosphere
ISSN: 19940416
出版年: 2016
卷: 10, 期:6
起始页码: 2611
结束页码: 2621
语种: 英语
英文关键词: autochthon ; carbon cycle ; concentration (composition) ; dissolved organic carbon ; dust ; ice cover ; light intensity ; microbial activity ; radiative forcing ; snow cover ; streamwater ; valley glacier ; China ; Laohugou Glacier ; Qinghai-Xizang Plateau ; Xinjiang Uygur
英文摘要: Light-absorbing dissolved organic carbon (DOC) constitutes a major part of the organic carbon in glacierized regions, and has important influences on the carbon cycle and radiative forcing of glaciers. However, few DOC data are currently available from the glacierized regions of the Tibetan Plateau (TP). In this study, DOC characteristics of a mediumsized valley glacier (Laohugou Glacier No. 12, LHG) on the northern TP were investigated. Generally, DOC concentrations on LHG were comparable to those in other regions around the world. DOC concentrations in snow pits, surface snow and surface ice (superimposed ice) were 332±132, 229±104 and 426±270 μg L-1, respectively. The average discharge-weighted DOC of proglacial stream water was 238±96 μg L-1, and the annual DOC flux released from this glacier was estimated to be 6949 kg Cyr-1, of which 46.2% of DOC was bioavailable and could be decomposed into CO2 within 1 month of its release. The mass absorption cross section (MAC) of DOC at 365 nm was 1.4±0.4m2 g-1 in snow and 1.3±0.7m2 g-1 in ice, similar to the values for dust transported from adjacent deserts. Moreover, there was a significant relationship between DOC and Ca2+; therefore, mineral dust transported from adjacent arid regions likely made important contributions to DOC of the glacierized regions, although contributions from autochthonous carbon and autochthonous/ heterotrophic microbial activity cannot be ruled out. The radiative forcing of snow pit DOC was calculated to be 0.43Wm-2, demonstrating that DOC in snow needs to be taken into consideration in accelerating melt of glaciers on the TP. © Author(s) 2016.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75048
Appears in Collections:影响、适应和脆弱性
气候变化与战略

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作者单位: Qilian Station for Glaciology and Ecological Environment, State Key Laboratory of Cryospheric Sciences, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, China; Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, China; CAS Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing, China; University of Chinese Academy of Sciences, Beijing, China; Laboratory of Green Chemistry, Lappeenranta University of Technology, Sammonkatu 12, Mikkeli, Finland; Department of Civil and Environmental Engineering, Florida International University, Miami, FL, United States

Recommended Citation:
Yan F,, Kang S,, Li C,et al. Concentration, sources and light absorption characteristics of dissolved organic carbon on a medium-sized valley glacier, northern Tibetan Plateau[J]. Cryosphere,2016-01-01,10(6)
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