Abstract
Abstract A potential influence of tropical sea surface temperature on the global climate response to a doubling of the CO2 concentration is tested using an atmospheric general circulation model coupled to a slab mixed layer ocean. The warming is significantly reduced when sea surface temperatures in the eastern equatorial Pacific cold tongue region between latitudes 2.25°N and 2.25°S are held at the control simulation values. Warming of the global mean temperature outside of the cold tongue region is reduced from 2.4°C in the unconstrained case to 1.9°C when the sea surface temperature constraint is applied. The decrease in the warming results from a positive net heat flux into the ocean cold tongue region and implicit heat storage in the subsurface ocean, induced by horizontal atmospheric heat fluxes. The reduced surface temperature warming outside of the cold tongue region is due to reduction in the downward longwave radiative flux at the surface, caused in turn by reduced atmospheric temperature and mo...
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