Climate model simulation demonstrates a southward shift of tropical rainfall under present-day sulfate emissions, indicating that asymmetric ocean cooling drives global precipitation changes.
An atmospheric global climate model coupled to a mixed layer ocean model is used to study changes in tropical rainfall due to the indirect effects of anthropogenic sulfate aerosol. The model is run to equilibrium for present-day (PD) and preindustrial (PI) sulfur emission scenarios. As in two other recent studies, the model generally gives a southward shift of tropical rainfall in the PD run relative to the PI run. This is largely due to a hemispheric asymmetry in the reduction of sea surface temperature (SST) induced by the perturbation of cloud albedo and lifetime.
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Rotstayn et al. (2002) studied this question.
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