Characteristics of GHG flux from water-air interface along a reclaimed water intake area of the Chaobai River in Shunyi, Beijing. (January 2018)

• Record Type: Journal Article
• Authors: He, Baonan; He, Jiangtao; Wang, Jian; Li, Jie; Wang, Fei
• Is Part Of: Atmospheric environment. Volume 172(2018)
• Page Start: 102
• Page End: 108
• Publication Date: 2018-01
• Subjects: CO2 flux -- CH4 flux -- Reclaimed water -- Spatio-diurnal variation -- Chaobai River; Air -- Pollution -- Periodicals; Air -- Pollution -- Meteorological aspects -- Periodicals; 551.51
• DOI: 10.1016/j.atmosenv.2017.10.060
• Languages: English
• ISSNs: 1352-2310

Abstract

Abstract: To understand greenhouse gas (GHG) flux in reclaimed water intake area impact on urban climate, 'static chamber' method was used to investigate the spatio-diurnal variations and the influence factors of GHG fluxes at water-air interface from Jian River to Chaobai River. Results showed that the average fluxes of CO2 from the Jian River and the Chaobai River were 73.46 mg(m 2 ·h) −1 and -64.75 mg(m 2 ·h) −1, respectively. CO2 was emitted the most in the Jian River, but it was absorbed from the atmosphere in the Chaobai River. Unary linear regression analyses demonstrated that Chlorophyll a (Chl a ) and pH variation controlled the carbon source and sink from the Jian River to the Chaobai River. The diurnal variation of CO2 fluxes was higher at night than in the daytime in the Jian River, and it was the inverse in the Chaobai River, which highly correlated with dissociative CO2 and HCO3 − transformation to CO3 2- . The average fluxes of CH4 from the Jian River and Chaobai River were 0.973 mg(m 2 ·h) −1 and 5.556 mg(m 2 ·h) −1, respectively, which increased along the water flow direction. Unary and multiple linear regression analyses demonstrated that Chl a and total organic carbon (TOC) controlled the increase of CH4 along the flow direction. The diurnal variation of CH4 fluxes was slightly higher in the daytime than at night due to the effect of water temperature. Graphical abstract: Highlights: The CO2 and CH4 fluxes showed different source and sink features in intake area. GHG emissions in intake area have obvious spatial and diurnal characteristics. The quality of reclaimed water has a significant influence on GHG emissions.