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uniformly in the zonal dimension; they change only in the meridional direction. Each tropical eruption, the aerosol cloud originates in the tropics, builds and spreads over a few months before decaying and is transported poleward six months to a year after the eruption as in Amman et al. (2003) . Because of the low vertical resolution in the climate model, which uses a Galerkin framework in the vertical, the optical thickness of the aerosol is converted to a reduction in shortwave radiation at the top
uniformly in the zonal dimension; they change only in the meridional direction. Each tropical eruption, the aerosol cloud originates in the tropics, builds and spreads over a few months before decaying and is transported poleward six months to a year after the eruption as in Amman et al. (2003) . Because of the low vertical resolution in the climate model, which uses a Galerkin framework in the vertical, the optical thickness of the aerosol is converted to a reduction in shortwave radiation at the top
