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Chemical weathering of small catchments on the Southeastern Tibetan Plateau I: Water sources, solute sources and weathering rates

文献类型：期刊论文

作者Jiang, Hao1,2,3,4; Liu, Wenjing1,2,3,4; Xu, Zhifang1,2,3,4; Zhou, Xiaode1,2,3,4; Zheng, Ziyan4,5; Zhao, Tong1,2,3,4; Zhou, Li6; Zhang, Xuan1,2,3,4; Xu, Yifu1,2,3,4; Liu, Taoze7
刊名CHEMICAL GEOLOGY
出版日期2018-11-15
卷号500页码:159-174
ISSN号0009-2541
关键词Small catchment Chemical weathering Solute sources Tibetan Plateau
DOI10.1016/j.chemgeo.2018.09.030
英文摘要Hydro-geochemical study of small catchment provides important information to identify water and solute sources, understand chemical weathering processes and their controlling factors. In this work, 44 small catchments on the southeastern Tibetan Plateau were investigated. Stream, precipitation, glacier and spring waters in both high and low flow seasons and bed rocks samples were analyzed with a main purpose to understand the processes controlling the stream water chemistry and quantify the weathering rates. The stream waters are mainly recharged by precipitation and glacier meltwater. Glacier meltwater and precipitation account for 25.8% and 73.9% of the total discharge in high flow season, and 44.4% and 54.1% in low flow season on average. Hydrograph separation and chemical mass balance are jointly used to estimate the contributions of major reservoirs (precipitation, glacier, spring, carbonates and silicates) to the total dissolved loads of the streams. Rock weathering accounts for similar to 90% of the total dissolved cations for most streams. Silicate and carbonate weathering account for 15.9% and 75.2% of total dissolved cations in high flow season, and 9.5% and 77.2% in low flow season on average. Lack of basic hydrological data in the ungauged remote area is a problem for quantified weathering study. The Noah LSM model is applied to obtain the annual runoff of these un-gauged catchments in this study. Based on these approaches, the chemical weathering rates and total denudation rates (TDR) are calculated for each of the small catchments. The silicate cation weathering rates (SCWR) range between 0.6 and 5.2 t/km(2)/yr, with the area-weighted mean value about 1.8 t/km(2)/yr. The TDR range between 8.9 and 1907.9 t/km(2)/yr. The comparisons between the small catchments and with other river basins in different tectonic and climatic environments indicate that lithology, climatic factors (temperature and runoff) and physical erosion rate are the key parameters controlling chemical weathering rate. The average SCWR of the small catchments is about 6 times higher in high flow season than in low flow season, which could be attributed to the higher temperature and runoff in high flow season. Meanwhile, the positive relationship between SCWR and TDR supports the view that physical erosion has an important effect on chemical weathering in the Tibetan Plateau.
WOS关键词DISSOLVED INORGANIC CARBON ; CO2 CONSUMPTION ; RIVER-BASIN ; ATMOSPHERIC CO2 ; HYDROGRAPH SEPARATIONS ; HAILUOGOU GLACIER ; BRAHMAPUTRA RIVER ; CLIMATIC CONTROLS ; DENUDATION RATES ; GLOBAL CLIMATE
资助项目Strategic Priority Research Program of Chinese Academy of Sciences[XDB26000000] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB15010405] ; Natural Science Foundation of China[41673020] ; Natural Science Foundation of China[91747202] ; Natural Science Foundation of China[41772380] ; Natural Science Foundation of China[41730857]
WOS研究方向Geochemistry & Geophysics
语种英语
出版者ELSEVIER SCIENCE BV
WOS记录号WOS:000448408000010
资助机构Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Natural Science Foundation of China ; Natural Science Foundation of China ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Natural Science Foundation of China ; Natural Science Foundation of China ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Natural Science Foundation of China ; Natural Science Foundation of China ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Natural Science Foundation of China ; Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/89145]  
专题地质与地球物理研究所_中国科学院新生代地质与环境重点实验室
通讯作者Liu, Wenjing; Xu, Zhifang
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing 100029, Peoples R China
2.CAS Ctr Excellence Life & Paleoenvironm, Beijing 100044, Peoples R China
3.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
5.Chinese Acad Sci, Inst Atmospher Phys, Key Lab Reg Climat Environm Temperate East Asia, Beijing 100029, Peoples R China
6.China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Hubei, Peoples R China
7.Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550081, Guizhou, Peoples R China
推荐引用方式
GB/T 7714		 Jiang, Hao,Liu, Wenjing,Xu, Zhifang,et al. Chemical weathering of small catchments on the Southeastern Tibetan Plateau I: Water sources, solute sources and weathering rates[J]. CHEMICAL GEOLOGY,2018,500:159-174.
APA Jiang, Hao.,Liu, Wenjing.,Xu, Zhifang.,Zhou, Xiaode.,Zheng, Ziyan.,...&Liu, Taoze.(2018).Chemical weathering of small catchments on the Southeastern Tibetan Plateau I: Water sources, solute sources and weathering rates.CHEMICAL GEOLOGY,500,159-174.
MLA Jiang, Hao,et al."Chemical weathering of small catchments on the Southeastern Tibetan Plateau I: Water sources, solute sources and weathering rates".CHEMICAL GEOLOGY 500(2018):159-174.

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来源：地质与地球物理研究所

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