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Volume 31 Issue 2
Jun.  2012
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Article Navigation >  CARSOLOGICA SINICA  > 2012  >  31(2): 145-153
CAO Min, JIANG Yong-jun, PU Jun-bing, ZHANG Xing-bo, QIU Shu-lan, YANG Ping-heng, WANG Zhi-jun, LI Huan-huan. Variations in DIC and δ13C DIC of the karst groundwater and in carbon sink of Laolongdong subterranean stream basin at Nanshan, Chongqing[J]. CARSOLOGICA SINICA, 2012, 31(2): 145-153. doi: 10.3969/j.issn.1001-4810.2012.02.006
Citation: CAO Min, JIANG Yong-jun, PU Jun-bing, ZHANG Xing-bo, QIU Shu-lan, YANG Ping-heng, WANG Zhi-jun, LI Huan-huan. Variations in DIC and δ13C DIC of the karst groundwater and in carbon sink of Laolongdong subterranean stream basin at Nanshan, Chongqing[J]. CARSOLOGICA SINICA, 2012, 31(2): 145-153. doi: 10.3969/j.issn.1001-4810.2012.02.006
shu

Variations in DIC and δ13C DIC of the karst groundwater and in carbon sink of Laolongdong subterranean stream basin at Nanshan, Chongqing

doi: 10.3969/j.issn.1001-4810.2012.02.006
  • 1.

    Key Laboratory of the Three Gorges Reservior Regions Eco-Environments, MOE& School of Geographical Sciences, Institute of Karst Environment and Rock Desertification Control, Southwest University

  • 2.

    Institute of Karst Geology, Chinese Academy of Geological Sciences, Karst Dynamics Laboratory, MLR & GZAR

  • Received Date: 2012-01-02
  • Publish Date: 2012-06-25
    Abstract
  • Study on chemical weathering of carbonate rock is of great significance for further understanding of the global carbon cycle. In this study, groundwater samples from the Laolongdong subterranean stream at Nanshan, Chongqing are investigated to analyze the variations in DIC and its origins. The carbon sink in the entire basin is calculated based on DIC concentrations and stream discharge rate, and the influence of related natural and human factors on the carbon sink is presented, too. The groundwater shows a Ca-HCO3-SO4 hydrochemistry type, indicating the dominant control of the dissolution of carbonate rock both by carbon and sulfuric acids in the basin. The concentration of DIC ranges from 3.1 mmol/L to 6.3 mmol/L and is generally low during rainy season due to the dilution by large amount of rainwater. The δ13C DIC varies from -3.8‰ to -13.1‰ and is 2‰ higher in the summer than the winter. According to the DIC concentration and stream discharge, the carbon sink in the Laolongdong subterranean stream is estimated to be averaged in about 167.31×103 mol/(km2? a) and tends to be higher in the summer but lower in the winter. During rainfall events, the carbon sink increases rapidly with the increase of discharge. Besides, the sulfuric acids derive from anthropogenic activities have great impact on the dissolution of carbonate rocks, resulting in relatively higher δ13C DIC values, especially in summer, which can reduce carbon sink caused by chemical weathering on carbonate rocks in the basin to a certain degree.

     

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