Abstract
Continuous measurement technique of CO2 concentration in surface seawater which was easy to use in the coastal sea is developed and applied to elucidate long-term CO2 dynamics in the coastal regions, where the short-term change is significant. Continuous measurements of salinity, pH and DO were conducted at two stations in Osaka Bay. The values of pCO2 were calculated using the "CO2SYS" by CDIAC that uses pH and total alkalinity. As a result, the measurement technique which we developed had enough accuracy, and it became clear that long-term data could be acquired. In summer and autumn, surface water CO2 fluctuation had large diurnal change by photosynthesis, and atmospheric CO2 is absorbed to sea water. In the winter when the stratification disappears, CO2 in seawater is released to the atmosphere.
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Schedule a callMore From: Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)
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