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Subject: 地理学::自然地理学
Title: Chemical Composition of Microbe-Derived Dissolved Organic Matter in Cryoconite in Tibetan Plateau Glaciers: Insights from Fourier Transform Ion Cyclotron Resonance Mass Spectrometry Analysis
Author: Feng, L (Feng, Lin)1; Xu, JZ (Xu, Jianzhong)1; Kang, SC (Kang, Shichang)1; Li, XF (Li, Xiaofei)1; Li, Y (Li, Yang)2; Jiang, B (Jiang, Bin)3; Shi, Q (Shi, Quan)3
Corresponding Author: Xu, JZ
Keyword: POLYCYCLIC AROMATIC-HYDROCARBONS ; GREENLAND ICE-SHEET ; SIZE DISTRIBUTION ; ALPINE GLACIERS ; CARBON ; NITROGEN ; HOLES ; LAKES ; ELECTROSPRAY ; PRODUCTIVITY
Source: ENVIRONMENTAL SCIENCE & TECHNOLOGY
Issued Date: 2016
DOI: 10.1021/acs.est.6b03971
Volume: 50, Issue:24, Pages:13215-13223
Indexed Type: SCI
Cooperation Status: 国内
DOC Type: Article
English Abstract: Cryoconite in mountain glaciers plays important roles in glacial ablation and biogeochemical cycles. In this study, the composition and sources of dissolved organic matter (DOM) in cryoconite from the ablation regions of two Tibetan Plateau glaciers were determined using electrospray ionization (ESI) Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) and fluorescence spectrometry. A marked absorbance between 300 and 350 nm in the DOM absorption spectra was observed which was consistent with microbe-derived mycosporine-like amino acids. Fluorescence excitation-emission matrices showed that DOM had intense signals at protein-like substance peaks and weak signals at humic-like substance peaks. The high resolution mass spectra of FT-ICR-MS showed cryoconite DOM from both glaciers contained diverse lignins, lipids, proteins, and unsaturated hydrocarbons. The lipids and proteins were consistent with material from microbial sources, and the lignins and unsaturated hydrocarbons were probably from vascular plant material supplied in atmospheric aerosols and debris from around the glaciers. Almost one-third DOM molecules had low C/N ratios (<= 20), indicating their high bioavailability. Using a conservative cryoconite distribution on Chinese mountain glacier surfaces (6%) and an average debris mass per square meter of cryoconite (292 +/- 196 g m(-2)), we found that the amount of DOC produced in cryoconite on Chinese glaciers as much as 0.23 +/- 0.1 Gg per cryoconite formation process. This dissolved organic carbon may absorb solar radiation, accelerate glacial melting, and be an important source of bioavailable DOM to proglacial and downstream aquatic ecosystems.
Language: 英语
WOS ID: WOS:000390620900006
Citation statistics:
Content Type: 期刊论文
URI: http://ir.itpcas.ac.cn/handle/131C11/7466
Appears in Collections:图书馆_期刊论文

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description.institution: 1.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryospher Sci, Lanzhou 730000, Peoples R China
2.Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing 100101, Peoples R China
3.China Univ Petr, State Key Lab Heavy Oil Proc, Beijing 102249, Peoples R China

Recommended Citation:
Feng, L ,Xu, JZ ,Kang, SC ,et al. Chemical Composition of Microbe-Derived Dissolved Organic Matter in Cryoconite in Tibetan Plateau Glaciers: Insights from Fourier Transform Ion Cyclotron Resonance Mass Spectrometry Analysis[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2016,50(24):13215-13223.
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