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Measurement technique of CO2 for coastal seas is developed and applied to elucidate CO2 dynamics in the coastal regions, where the photosynthetic rate is far larger than that in the open sea and the short-term change is significant. Continuous measurements of salinity, pH and DO were conducted at three stations in Osaka Bay. The values of CO2 related terms were calculated using a classical method that uses pH and total alkalinity. Dissolved inorganic carbon (DIC) and DO fluctuated with high correlation (R2 = 0.97). This suggests that CO2 system can be measured by this method in coastal regions. DO and pCO2 (CO2 partial pressure) records in the eastern Osaka Bay, where primary production is significant, indicated prominent diurnal variations which correspond to diurnal irradiation variations. In contrast, magnitudes of DO and pCO2 variations were smaller in a well mixed reason in the western Osaka Bay.

Carbon Dioxide Dynamics in Coastal Regions of Osaka Bay