On the temperature coefficient of PCO
2 in seawater |
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| Authors: | Ferren MacIntyre |
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| Institution: | (1) Graduate School of Oceanography, University of Rhode Island, 02881 Kingston, Rhode Island, USA |
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| Abstract: | The commonly reported temperature coefficient of P. the equilibrium partial pressure of CO2, is ( P/T)
A,C
,which is about 15 ppm/°C, or 5% of the atmospheric partial pressure of CO2. This coefficient, however, applies only to deep water, not to surface water which can exchange CO2 with the atmosphere. The coefficient (P/T)
A,C
,, where  designates constancy of the sum of atmospheric and surface-ocean CO2, is the appropriate value for air-sea exchange. Numerical values are mass-dependent because the depth of the exchanging ocean layer must be specified. For a 100-m surface layer, the value is ca. 1.5 ppm/°C, or 0.5% of ambient CO2.
Editor's Note:In view of the interdisciplinary importance of the carbon dioxide-climate problem, this note on seawater chemistry should be of interest to specialists beyond the discipline of ocean chemistry. |
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