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Spatiotemporal Variation of CO2 Partial Pressure and Exchange Flux at Air-water Interfaces from the Hongfeng Reservoir (Vol.47, No.6, Tot No.332) TEXT SIZE: A A A

LIU Taoze1, WANG Baoli2, LIANG Chongshan3, WANG Xiaodan1, YANG Cheng1

(1.Institute of Karst Wetland Ecology, College of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang 550025, China;
2. Tianjin Key Laboratory of Earth Critical Zone Science and Sustainable Development in Bohai Rim, Institute of Surface Earth System Science, Tianjin University, Tianjin 300072, China;
3. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang , 550081, China)

Abstract: Hongfeng Reservoir is a typical artificial lake in the karst area of southwest China, with its special hydrogeological characteristics. Accurate estimation of its CO2 emission flux is of great significance for understanding the carbon cycle of the reservoir. Therefore, From July 2017 to April 2018, the temporal and spatial variation of pCO2 and quality parameters in the surface waters of the reservoir area (South Lake and North Lake) was investigated by the shipboard monitoring. The results show that the pCO2 in the Hongfeng Reservoir has obvious spatiotemporal difference. The water pCO2 exceeds the atmospheric pCO2 during autumn and winter, suggesting that it is the source of CO2 emissions. In spring and summer, it is an absorption CO2 sink. According to spatial distribution, the north lake water pCO2 is significantly higher than south lake in spring and autumn, especially in autumn. Based on the dense data sets by the shipboard monitoring, the annual average emission of Hongfeng Reservoir is calculated to be about 6.13 mmol/(m2·d).

Key words: Hongfeng Reservoir; CO2 partial pressure; flux; spatiotemporal variation

EARTH AND ENVIRONMENT Vol.47, No.6, Tot No.332, 2019, Page 851-856

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