Characteristics of carbon source greenhouse gas flux in the water–air formation in the middle and upper reaches of the Three Gorges Reservoir. Issue 1 (11th December 2021)

• Record Type: Journal Article
• Authors: Qin, Yu; Yu, Zongtai; Gou, Yujia; Liu, Zhengmian
• Is Part Of: Water policy. Volume 24:Issue 1(2022)
• Page Start: 49
• Page End: 65
• Publication Date: 2021-12-11
• Subjects: CO2 -- CH4 -- mainstream of middle and upper reaches -- Three Gorges Reservoir -- water–air formation flux; Water-supply -- Management -- International cooperation; Water resources development -- International cooperation; Periodicals; 333.911505
• DOI: 10.2166/wp.2021.228
• Languages: English
• ISSNs: 1366-7017

Abstract

Abstract: This study selected five points in the middle and upper mainstream of the Three Gorges Reservoir area. Starting from May 2016, the greenhouse gases CO2 and CH4 from the water–air formation at the sampling points have been monitored month by month for 10 months. Using the headspace balance method and the thin boundary layer model estimation method, we obtained the CO2 and CH4 partial pressure ranges and the water–air formation diffusion flux at the mainstream point. It is found that the CH4 partial pressure of water body is significantly positively correlated with water temperature, and significantly negatively correlated with DO; the CH2 partial pressure of water body is positively correlated with water temperature, but negatively correlated with conductivity, DO, pH and wind speed. The diffusion fluxes of CH4 and CO2 at the water–air formation are positively correlated with CH4 partial pressure and water temperature, and negatively correlated with ph, DO and conductivity. It is also found that the reservoir has a certain mitigation effect on the release of CO2 from the river water body, and the CH4 diffusion flux at the water–air formation is roughly equivalent. HIGHLIGHTS: This study adopts the headspace balance technology to establish a water body carbon source greenhouse gas monitoring method suitable for reservoirs in the upper reaches of the Yangtze River. This study monitors and analyzes the greenhouse gas concentrations of carbon sources in water bodies at typical points of upstream reservoirs in different seasons and different operating conditions.