气候变化领域集成服务门户(CCPortal): Molecular Insights into Glacial Cryoconite Dissolved Organic Matter Evolution under Dark Conditions during the Ablation Season on the Tibetan Plateau

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DOI	10.1021/acsearthspacechem.0c00361
	Molecular Insights into Glacial Cryoconite Dissolved Organic Matter Evolution under Dark Conditions during the Ablation Season on the Tibetan Plateau
	Feng, Lin; An, Yanqing; Xu, Jianzhong; Kellerman, Anne M.; Patino, Martha L. Chacon; Spencer, Robert G. M.
通讯作者	Xu, JZ (通讯作者)，Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryospher Sci, Lanzhou 730000, Peoples R China. ; Spencer, RGM (通讯作者)，Florida State Univ, Natl High Magnet Field Lab Geochem Grp, Tallahassee, FL 32306 USA. ; Spencer, RGM (通讯作者)，Florida State Univ, Dept Earth Ocean & Atmospher Sci, Tallahassee, FL 32306 USA.
发表日期	2021
ISSN	2472-3452
起始页码	870
结束页码	879
卷号	5 期号:4
英文摘要	Cryoconite granules are dark-colored spherical aggregates and an important sink for organic matter accumulated in supraglacial environments. However, the variations in dissolved organic matter (DOM) concurrent with the leaching process during cryoconite evolution are poorly understood. This study characterized the evolution of DOM from cryoconite leaching throughout a 30 day in situ experiment in the dark on a mountain glacier of the Tibetan Plateau. The results show that the concentration of dissolved organic carbon (DOC) leached from cryoconite decreased initially from 13.41 +/- 2.71 to 7.10 +/- 2.86 mg C L-1 from day 0 to day 3 but then gradually increased to 53.96 +/- 4.31 mg C L-1 by day 30 with an average DOC leaching rate of 20.32 +/- 0.27% in one ablation season. The DOM absorbance (a(254) and a(365)) at each time point (not including day 0) was highly correlated with the DOC concentration (n = 4, r = 0.98), suggesting an enrichment of chromophoric DOM during the leaching process. The molecular composition of DOM analyzed through Fourier transform ion cyclotron resonance mass spectrometry determined that the initial cryoconite DOM from day 0 was enriched in aliphatic (26%) and peptide-like compounds (20%), suggesting high biolability. Between days 0 and 3, extensive loss of peptide-like and aliphatic compounds was exhibited. Then, from day 3 to 30, 43% of leachate DOM was primarily composed of unique unsaturated, polyphenolic, and condensed aromatic compounds, which were newly produced or leached from cryoconite. Finally, the leaching flux of DOC from cryoconite on the Tibetan Plateau in one ablation season and its potential radiative forcing are evaluated.
关键词	LIGHT-ABSORBING IMPURITIES RESOLUTION MASS DATA MICROBIAL COMMUNITIES CARBON AEROSOLS ABSORPTION SNOW TRANSFORMATION SPECTROMETER ASPHALTENES INDEX
英文关键词	cryoconite; evolution; DOM; FT-ICR MS
语种	英语
WOS研究方向	Chemistry ; Geochemistry & Geophysics
WOS类目	Chemistry, Multidisciplinary ; Geochemistry & Geophysics
WOS记录号	WOS:000641221000011
来源期刊	ACS EARTH AND SPACE CHEMISTRY
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/253998
作者单位	[Feng, Lin; An, Yanqing; Xu, Jianzhong] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryospher Sci, Lanzhou 730000, Peoples R China; [Feng, Lin] Aba Teachers Univ, Wenchuan 623002, Peoples R China; [Kellerman, Anne M.; Patino, Martha L. Chacon; Spencer, Robert G. M.] Florida State Univ, Natl High Magnet Field Lab Geochem Grp, Tallahassee, FL 32306 USA; [Kellerman, Anne M.; Patino, Martha L. Chacon; Spencer, Robert G. M.] Florida State Univ, Dept Earth Ocean & Atmospher Sci, Tallahassee, FL 32306 USA
推荐引用方式 GB/T 7714	Feng, Lin,An, Yanqing,Xu, Jianzhong,et al. Molecular Insights into Glacial Cryoconite Dissolved Organic Matter Evolution under Dark Conditions during the Ablation Season on the Tibetan Plateau[J]. 中国科学院西北生态环境资源研究院,2021,5(4).
APA	Feng, Lin,An, Yanqing,Xu, Jianzhong,Kellerman, Anne M.,Patino, Martha L. Chacon,&Spencer, Robert G. M..(2021).Molecular Insights into Glacial Cryoconite Dissolved Organic Matter Evolution under Dark Conditions during the Ablation Season on the Tibetan Plateau.ACS EARTH AND SPACE CHEMISTRY,5(4).
MLA	Feng, Lin,et al."Molecular Insights into Glacial Cryoconite Dissolved Organic Matter Evolution under Dark Conditions during the Ablation Season on the Tibetan Plateau".ACS EARTH AND SPACE CHEMISTRY 5.4(2021).