气候变化领域集成服务门户(CCPortal): Chemical weathering and CO2 consumption in the glaciated Karuxung River catchment, Tibetan Plateau

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DOI	10.1002/hyp.14330
	Chemical weathering and CO2 consumption in the glaciated Karuxung River catchment, Tibetan Plateau
	Zhang, Fan; Xiao, Xiong; Wang, Lijie; Zeng, Chen; Yu, Zhengliang; Wang, Guanxing; Shi, Xiaonan
通讯作者	Xiao, X (通讯作者)
发表日期	2021
ISSN	0885-6087
EISSN	1099-1085
卷号	35 期号:8
英文摘要	Climate factors play critical roles in controlling chemical weathering, while chemically weathered surface material can regulate climate change. To estimate global chemical weathering fluxes and CO2 balance, it is important to identify the characteristics and driving factors of chemical weathering and CO2 consumption on the Tibetan Plateau, especially in glaciated catchments. The analysis of the hydro-geochemical data indicated that silicate weathering in this area was inhibited by low temperatures, while carbonate weathering was promoted by the abundant clastic rocks with fresh surfaces produced by glacial action. Carbonate weathering dominated the riverine solute generation (with a contribution of 58%, 51%, and 43% at the QiangYong Glacier (QYG), the WengGuo Hydrological Station (WGHS), and the lake estuary (LE), respectively). The oxidation of pyrite contributed to 35%, 42%, and 30% of the riverine solutes, while silicate weathering contributed to 5%, 6%, and 26% of the riverine solutes at the QYG, WGHS, and LE, respectively. The alluvial deposit of easily weathering fine silicate minerals, the higher air temperature, plant density, and soil thickness at the downstream LE in comparison to upstream and midstream may lead to longer contact time between pore water and mineral materials, thus enhancing the silicate weathering. Because of the involvement of sulfuric acid produced by the oxidation of pyrite, carbonate weathering in the upstream and midstream did not consume atmospheric CO2, resulting in the high rate of carbonate weathering (73.9 and 75.6 t km(-2) yr(-1), respectively, in maximum) and potential net release of CO2 (with an upper constraint of 35.6 and 35.2 t km(-2) yr(-1), respectively) at the QYG and WGHS. The above results indicate the potential of the glaciated area of the Tibetan Plateau with pyrite deposits being a substantial natural carbon source, which deserves further investigation.
关键词	HAUT-GLACIER-DAROLLA SULFIDE OXIDATION CARBONATE DISSOLUTION SEASONAL-VARIATIONS NEGATIVE FEEDBACK PHYSICAL EROSION DENUDATION RATES ATMOSPHERIC CO2 SOUTHERN TIBET BASIN
英文关键词	chemical weathering; CO2 consumption; glaciated catchments; pyrite oxidation; Tibetan Plateau
语种	英语
WOS研究方向	Water Resources
WOS类目	Water Resources
WOS记录号	WOS:000691011400029
来源期刊	HYDROLOGICAL PROCESSES
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/260202
推荐引用方式 GB/T 7714	Zhang, Fan,Xiao, Xiong,Wang, Lijie,et al. Chemical weathering and CO2 consumption in the glaciated Karuxung River catchment, Tibetan Plateau[J]. 中国科学院青藏高原研究所,2021,35(8).
APA	Zhang, Fan.,Xiao, Xiong.,Wang, Lijie.,Zeng, Chen.,Yu, Zhengliang.,...&Shi, Xiaonan.(2021).Chemical weathering and CO2 consumption in the glaciated Karuxung River catchment, Tibetan Plateau.HYDROLOGICAL PROCESSES,35(8).
MLA	Zhang, Fan,et al."Chemical weathering and CO2 consumption in the glaciated Karuxung River catchment, Tibetan Plateau".HYDROLOGICAL PROCESSES 35.8(2021).