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DOI	10.1017/aog.2018.20
	Characteristics and sources of dissolved organic matter in a glacier in the northern Tibetan Plateau: differences between different snow categories
	Feng, Lin; An, Yanqing; Xu, Jianzhong; Kang, Shichang
发表日期	2018
ISSN	0260-3055
EISSN	1727-5644
卷号	59 期号:77
英文摘要	Dissolved organic matter (DOM) in mountain glaciers is an important source of carbon for downstream aquatic systems, and its impact is expected to increase due to the increased melting rate of glaciers. We present a comprehensive study of Laohugou glacier no. 12 (LHG) at the northern edge of the Tibetan Plateau to characterize the DOM composition and sources by analyzing surface fresh snow, granular ice samples, and snow pit samples which covered a whole year cycle of 2014/15. Excitation-emission matrix fluorescence spectroscopy analysis of the DOM with parallel factor analysis (EEM-PARAFAC) identified four components, including a microbially humic-like component (C1), two protein-like components (C2 and C3) and a terrestrial humic-like component (C4). The use of Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) showed that DOM from all these samples was dominated by CHO and CHON molecular formulas, mainly corresponding to lipids and aliphatic/proteins compounds, reflecting the presence of significant amounts of microbially derived and/or deposited biogenic DOM. Themolecular compositions ofDOMshowedmore CHONcompounds in granular ice than in fresh snow, likely suggesting newly formed DOM from microbes during snowmelting.
关键词	biogeochemistry glacier chemistry mountain glaciers
学科领域	Physical Geography; Geology
语种	英语
WOS研究方向	Geography, Physical ; Geosciences, Multidisciplinary
来源期刊	ANNALS OF GLACIOLOGY
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/111942
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	Feng, Lin,An, Yanqing,Xu, Jianzhong,et al. Characteristics and sources of dissolved organic matter in a glacier in the northern Tibetan Plateau: differences between different snow categories[J]. 中国科学院西北生态环境资源研究院,2018,59(77).
APA	Feng, Lin,An, Yanqing,Xu, Jianzhong,&Kang, Shichang.(2018).Characteristics and sources of dissolved organic matter in a glacier in the northern Tibetan Plateau: differences between different snow categories.ANNALS OF GLACIOLOGY,59(77).
MLA	Feng, Lin,et al."Characteristics and sources of dissolved organic matter in a glacier in the northern Tibetan Plateau: differences between different snow categories".ANNALS OF GLACIOLOGY 59.77(2018).