Seawater calcium ion (Ca) concentration was investigated based on the potentiometric titration method during the summer of 2018 in the Bohai Sea, China. The measured Ca concentration ranged from 7760 to 9739 μmol kg and deviated from the theoretical Ca values, which were estimated from the calcium/salinity ratio. The excess calcium (Ca) ranged from 186 to 1229 μmol kg, showing a decreasing trend from the estuary to the nearshore, and then the offshore areas. Riverine input was an important source of seawater Ca in the Bohai Sea. Biological activity was another factor in regulating seawater Ca by precipitation in the Yellow River estuary and dissolution in other area of the Bohai Sea. Furthermore, the aragonite saturation state (Ω) values calculated from the measured Ca concentrations showed a significant deviation from the values calculated from the theoretical Ca concentrations, especially in the estuarine area with a maximum difference of 18.5%. Therefore, the disregard of the calcium addition would lead to an underestimation of the calcium carbonate saturation state and a deviation in the assessment of ocean acidification in marginal seas.
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