[Measurement of the CO2 flux on the water-air interface of Taihu Lake].

Based on the measurement of the CO2 flux on the water-air interface of Taihu Lake by closed chamber technique from January 2003 to June 2005, variation characteristics of the CO2 flux on the water-air interface in Taihu Lake are analyzed. Diurnal variation of the CO2 flux on the water-air interface is obvious. The CO2 flux is -0.79 mg/(m2 x h) in spring, -4.89 mg/(m2 x h) in summer, -4.06 mg/(m2 x h) in autumn and -2.56 mg/(m2 x h) in winter. Taihu Lake is the sink of carbon monoxide. The CO2 flux gets larger in severer polluted area of the lake. Seasonal variation is not apparent in the algae type lake, but obvious in grass type lake. It is high in summer and autumn, and low in spring and winter. Correlative factors of CO2 flux on the water-air interface of Taihu Lake possibly include weather, solar radiation, wind velocity, temperature, pH, TA, Chla, TC, TN and TP.