Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.scitotenv.2010.06.007
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dc.titleChemical weathering inferred from riverine water chemistry in the lower Xijiang basin, South China
dc.contributor.authorSun, H.
dc.contributor.authorHan, J.
dc.contributor.authorLi, D.
dc.contributor.authorZhang, S.
dc.contributor.authorLu, X.
dc.date.accessioned2011-02-23T07:35:50Z
dc.date.available2011-02-23T07:35:50Z
dc.date.issued2010
dc.identifier.citationSun, H., Han, J., Li, D., Zhang, S., Lu, X. (2010). Chemical weathering inferred from riverine water chemistry in the lower Xijiang basin, South China. Science of the Total Environment 408 (20) : 4749-4760. ScholarBank@NUS Repository. https://doi.org/10.1016/j.scitotenv.2010.06.007
dc.identifier.issn00489697
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/19895
dc.description.abstractSeasonal sampling was conducted on 13 sites involving the lower stem of the Xijiang river and its three tributaries to determine the spatial patterns of the riverine water chemistry and to quantify the chemical weathering rates of carbonate and silicate of the bedrock. Results indicate that the major ions in the Xijiang river system are dominated by Ca2+ and HCO3 - with a higher concentration of total dissolved solids, characteristic of the drainages developed on typical carbonate regions. Obvious spatial variations of major ion concentrations are found at various spatial scales, which are dominantly controlled by the lithology particularly carbonate distribution in the region. The four selected rivers show similar seasonal variations in major ions, with lower concentrations during the rainy season. Runoff is the first important factor for controlling the weathering rate in the basin, although increasing temperature and duration of water-rock interaction could make positive contributions to the enhancement of chemical weathering. The chemical weathering rates range from 52.6 to 73.7 t/km2/yr within the lower Xijiang basin and carbonate weathering is over one order of magnitude higher than that of silicates. CO2 consumption rate by rock weathering is 2.0 × 1011 mol/yr, of which more than 60% is contributed by carbonate weathering. The flux of CO2 released to the atmosphere-ocean system by sulfuric acid-induced carbonate weathering is 1.1 × 105 mol/km2/yr, comparable with the CO2 flux consumed by silicate weathering. © 2010 Elsevier B.V. All rights reserved.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1016/j.scitotenv.2010.06.007
dc.sourceScopus
dc.subjectCarbonate weathering
dc.subjectCO2consumption
dc.subjectLower Xijiang basin
dc.subjectSilicate weathering
dc.subjectWater geochemistry
dc.typeArticle
dc.contributor.departmentGEOGRAPHY
dc.description.doi10.1016/j.scitotenv.2010.06.007
dc.description.sourcetitleScience of the Total Environment
dc.description.volume408
dc.description.issue20
dc.description.page4749-4760
dc.description.codenSTEVA
dc.identifier.isiut000281931500055
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