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Comparison of the calculated pCO2 profile from WOCE P17N stations utilizing the thermodynamic constants from several sources. The deep water values are in agreement to about ±10 ppm, but the warmer surface waters show a spread of about ±25 ppm. It is not necessary to use these constants to derive a ΔTCO2 value, but they are required to link calculated changes in oceanic chemical composition to the atmospheric driving signal.
