FU Jianan1, CAO Man1, DENG Bing2, ZHOU Ziran2, CHEN Yao3, DANG Chenghua3, WANG Yuchun4, WANG Fushun1,*
（1.School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China;
2.State Key Laboratory of Estuarine and coastal Research, East China Normal University, Shanghai 200633, China;
3.Hebei University of Engineering, Handan 056038, China;
4.Department of Water Environment, China Institute of Water Resources and Hydroelectric Power Research, Beijing 100038, China）
Abstract: In this study, typical mainstream and tributaries of the Three Gorges Reservoir were investigated during high water level period, in order to understand the distribution of partial pressure of carbon dioxide (pCO2) and its diffusion flux. The pCO2 of surface water in the mainstream and tributaries in Fengjie Region was detected once a month by underway observation system from September to November. At the regular sites, pCO2 and some related water quality parameters along the water column were also determined. Results show that, there are significant differences of pCO2 in surface water body between mainstream and tributaries. In comparison with tributaries, diffusion flux of dissolved carbon dioxide (F-CO2) from mainstream has less variation, with a value of 28.19 ± 0.80 mmol/(m2·d). As for tributaries, their F-CO2 turn negative into positive; F-CO2 of the Zhuyi River, the Meixi River and the Caotang River range -6.86 to 32.05, -6.94 to 37.85, and and -6.97 to 31.05 mmol/(m2·d), respectively. Taking all high water level period from October to January of the next year into consideration, based on the date of October and November, 166.45 kiloton of CO2 would be emitted to atmosphere of the whole reservoir, while 30.17% of it came from tributaries.
Key words: Three Gorges Reservoir; high water level; partial pressure; CO2; diffusion flux
EARTH AND ENVIRONMENT Vol. 44, No.1 Tot No.309, 2016, Page 64-72
