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A method is presented for the accurate calculation of in situ pH from surface measurements on sampled seawater, based on the assumption that total CO2, total alkalinity, and total boron are invariant with respect to temperature and pressure when expressed in eq/kg units. Sample calculation on a model seawater is presented, and it shown that the "average temperature coefficient" of the pH of seawater is a function of salinity, pH, and alkalinity of the water.
Limnology and Oceanography