Abstract
In Lake Komuke, which is an important lagoon as carbon sinks, we analyzed previous data and found that salinity and biological metabolism (e.g., photosynthesis and respiration as shown by ΔDIC) are the two key environmental factors affecting CO2 fugacity in the water column. Further, the data were analyzed using an approximate expression and the numerical computations using three-dimensional numerical model during spring flood to predict spatial and temporal variation of air-sea CO2 flux. Results show that air-sea CO2 flux changes into negative (i.e., absorption) when the lake is autotrophic with ΔDIC being < -100μmol/kg.
