气候变化领域集成服务门户(CCPortal): Immobilization of relic anthropogenic dissolved organic matter from alpine rivers in the Himalayan-Tibetan Plateau in winter

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DOI	10.1016/j.watres.2019.05.052
	Immobilization of relic anthropogenic dissolved organic matter from alpine rivers in the Himalayan-Tibetan Plateau in winter
	Chen, Meilian; Li, Chaoliu; Zeng, Chen; Zhang, Fan; Raymond, Peter A.; Hur, Jin
通讯作者	Chen, ML (通讯作者)
发表日期	2019
ISSN	0043-1354
EISSN	1879-2448
起始页码	97
结束页码	106
卷号	160
英文摘要	The Tibetan Plateau is a critical ecosystem that sensitively responds to ongoing glacier shrinkage and permafrost thaw. Dissolved organic matter (DOM) in Tibetan Alpine rivers plays pivotal roles in the biogeochemical cycling of elements and nutrients at regional and even global scales, impacting water quality, downstream environments, and climate. However, little is known about the characteristics and dynamics of DOM in these watersheds. We investigated five major Himalayan rivers in the southern Tibetan Plateau, utilizing bulk dissolved organic carbon (DOC), optical properties, and molecular formulas. We found extremely low DOC and fluorescent DOM (FDOM) levels in the rivers (average DOC: 0.25-0.87 mg L-1, FDOM: 0.02-0.05 RU) with a highly degraded molecular signature, which was enriched with heteroatomic molecular formulas (S-containing: 58-72%, N-containing: 61-86%) and condensed aromatics (31-39% vs. similar to 11% in world major rivers). Further, 81-99% of the condensed aromatics was identified as dissolved black nitrogen (DBN) with multiple nitrogen atoms, typical for grassy biomass combustion. The findings highlighted potentially fast DOM remineralization leading to the release of CO2 and enriched apparently anthropogenic condensed aromatics and heteroatomic formulas in what have been considered pristine Tibetan rivers. These findings should be considered in future biogeochemical models and ecosystem management. (C) 2019 Elsevier Ltd. All rights reserved.
关键词	LIGHT-ABSORPTION CHARACTERISTICS MOLECULAR-WEIGHT SURFACE ACCUMULATION CARBON-DIOXIDE FLUORESCENCE ANCIENT TRANSFORMATION GLACIERS SOILS BIOLABILITY
英文关键词	dissolved organic matter; EEM-PARAFAC; FT-ICR-MS; Alpine rivers; Anthropogenic effects; Himalayan-Tibetan plateau
语种	英语
WOS研究方向	Engineering ; Environmental Sciences & Ecology ; Water Resources
WOS类目	Engineering, Environmental ; Environmental Sciences ; Water Resources
WOS记录号	WOS:000474327700010
来源期刊	WATER RESEARCH
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259556
推荐引用方式 GB/T 7714	Chen, Meilian,Li, Chaoliu,Zeng, Chen,et al. Immobilization of relic anthropogenic dissolved organic matter from alpine rivers in the Himalayan-Tibetan Plateau in winter[J]. 中国科学院青藏高原研究所,2019,160.
APA	Chen, Meilian,Li, Chaoliu,Zeng, Chen,Zhang, Fan,Raymond, Peter A.,&Hur, Jin.(2019).Immobilization of relic anthropogenic dissolved organic matter from alpine rivers in the Himalayan-Tibetan Plateau in winter.WATER RESEARCH,160.
MLA	Chen, Meilian,et al."Immobilization of relic anthropogenic dissolved organic matter from alpine rivers in the Himalayan-Tibetan Plateau in winter".WATER RESEARCH 160(2019).