Air-sea fluxes of CO2, H2O and heat have been calculated for a surface-renewal model with turbulent mixing on the air side of the interface and coupling of heat and matter fluxes in the stagnant air layer adjacent to the surface of the liquid. The magnitude and direction of the CO2 flux are strongly dependent on the temperature of the surface layer of liquid, as influenced by the air temperature and by the evaporation or condensation of water. Temperature effects arise both from coupling of heat and matter fluxes and from the temperature dependence of CO2 solubility at the surface. ¿ American Geophysical Union 1992