TEMPORAL VARIATION OF CARBON DIOXIDE FLUX ON OMAEHAMA IN INNER PART OF OSAKA BAY

Abstract

 To reveal the relationship between temporal variation of CO₂ flux and water quality using eddy correlation method at Omaehama beach in the inner part of Osaka Bay was conducted in this study. During the observation period, the CO₂ flux fluctuated between -0.90 and 0.67 mgCO₂/m²/s. CO₂ was absorbed in all the neap tides, and was emited in spring tides. In addition, CO₂ flux at daytime was absorbed about 2.8 times than that at night in the neap tide. There was no strong correlation CO₂ flux and the surface water quality. It was thought that CO₂ flux in the inner part of Osaka Bay fluctuated with neap and spring tide. Therefore, CO₂ flux was effected by tide, but not events such as hypoxia, stratification and occurrence of hydrogen sulfide.