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Enhanced sulfide oxidation by monsoon rainfall in a small typical karstic catchment of Southwest China

文献类型：期刊论文

作者Han, Xiaokun3; Yan, Zelong2; Lang, Yunchao3; Ding, Hu3; Guo, Qingjun1; Li, Siliang3
刊名JOURNAL OF HYDROLOGY
出版日期2022-12-01
卷号615页码:10
关键词Sulfate Sulfur isotopes Oxygen isotopes Karst Sulfide oxidation Chemical weathering
ISSN号0022-1694
DOI10.1016/j.jhydrol.2022.128682
通讯作者Lang, Yunchao(yunchao.lang@tju.edu.cn) ; Ding, Hu(dinghu@tju.edu.cn)
英文摘要CO2 is released to the atmosphere via sulfuric acid weathering of carbonate rocks, affecting the flux of CO2 drawdown via silicate weathering. Precisely quantifying the proportion of oxidative weathering of sulfide minerals to riverine sulfate is critical to improving the estimation of the global carbon budge. Sulfur and oxygen isotopic compositions of sulfate and major ion concentrations in river water samples collected monthly at 12 sampling sites from a small typical karstic catchment of Southwest China were analyzed, in order to quantify the relative contribution of sulfide oxidation to riverine sulfate and elucidate the factors affecting its changes. Results show that the sulfate concentration and delta 34Ssulfate and delta 18Osulfate values at most sampling sites have obvious seasonal changes, with low values in the monsoon season and high values in the non-monsoon season, suggesting that the relative contributions of different sulfur sources to riverine sulfate are seasonally variable throughout of the year. Results from the Beyesian isotope mixing model show that overall, the fraction of sulfide-derived sulfate to riverine sulfate ranges from 44.3 +/- 13.7% to 53.3 +/- 10.5%, although it has a wide range for different sam-pling sites. In addition, the relative contribution of sulfide weathering displays a seasonal variation and is higher in the monsoon season, which is mainly attributed to the influence of high rainfall in wet season. This study indicates that an increase in rainfall intensity under climate change may lead to a raised sulfide oxidation rate in the karstic catchment, which is important for assessment of global carbonate and silicate weathering in future.
WOS关键词PYRITE OXIDATION ; ISOTOPIC COMPOSITION ; SULFUR ISOTOPES ; XIJIANG RIVER ; OXYGEN ; SULFATE ; CO2 ; DISSOLUTION ; CHEMISTRY ; BACTERIAL
资助项目Strategic Priority Research Program of Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Key Research and Development Program of China ; [XDB40020200] ; [41925002] ; [41971123] ; [42103052] ; [2016YFA0601002]
WOS研究方向Engineering ; Geology ; Water Resources
语种英语
WOS记录号WOS:000895770900004
出版者ELSEVIER
资助机构Strategic Priority Research Program of Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Key Research and Development Program of China
源URL[http://ir.igsnrr.ac.cn/handle/311030/188152]  
专题中国科学院地理科学与资源研究所
通讯作者Lang, Yunchao; Ding, Hu
作者单位1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Ctr Environm Remediat, Beijing 100101, Peoples R China
2.Dalian Univ Technol, Sch Environm Sci & Technol, Dalian, Peoples R China
3.Tianjin Univ, Inst Surface Earth Syst Sci, Sch Earth Syst Sci, Tianjin 300072, Peoples R China
推荐引用方式
GB/T 7714		 Han, Xiaokun,Yan, Zelong,Lang, Yunchao,et al. Enhanced sulfide oxidation by monsoon rainfall in a small typical karstic catchment of Southwest China[J]. JOURNAL OF HYDROLOGY,2022,615:10.
APA Han, Xiaokun,Yan, Zelong,Lang, Yunchao,Ding, Hu,Guo, Qingjun,&Li, Siliang.(2022).Enhanced sulfide oxidation by monsoon rainfall in a small typical karstic catchment of Southwest China.JOURNAL OF HYDROLOGY,615,10.
MLA Han, Xiaokun,et al."Enhanced sulfide oxidation by monsoon rainfall in a small typical karstic catchment of Southwest China".JOURNAL OF HYDROLOGY 615(2022):10.

入库方式： OAI收割

来源：地理科学与资源研究所

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