Abstract
Since CO2 is easily soluble in water, when the concentration of CO2 in the atmosphere rises, that in seawater also rises. This causes the surface ocean acidification, which may alter the chemical and biological activities in the surface ocean. Therefore, it is important to know the temporal and spatial changes in CO2 concentration in the surface ocean. However, seawater CO2 concentration has large regional and seasonal variations mainly because of biological activities. In this study, we proposed an effective measure of the seawater CO2 concentration from the relationship between [DIC + kDO] and water temperature. A strong linear correlation was found for this relationship using seawater data off Tomakomai and in Osaka Bay, Japan. Furthermore, we confirmed that correction with salinity improves this correlation, because salinity is known to have a good correlation with alkalinity, which directly affects DIC. It is expected that this measure can also be applicable to judge the possibility of unexpected leakage of CO2 stored in the sub-seabed geological formation.
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