Interactive soil dust aerosol model in the GISS GCM 1. Sensitivity of the soil dust cycle to radiative properties of soil dust aerosols

The sensitivity of the soil dust aerosol cycle to radiative forcing by the soil dust aerosol particles themselves is studied. Four experiments with th e NASA GISS atmospheric general circulation model, which includes a soil du st aerosol model, are compared, all using a prescribed climatological sea s urface temperature as a lower boundary condition. In one experiment, dust i s included as a dynamic tracer with no radiative effect, whereas dust inter acts with radiation in the other simulations. The single-scattering albedo of dust particles is prescribed to be globally uniform in the experiments w ith radiatively active dust, although this albedo is varied from experiment to experiment. On a global scale the radiative forcing by dust generally c auses a reduction in the atmospheric dust load, corresponding to a decrease d dust source flux. The dust source flux and its changes are analyzed in mo re detail for the main source regions. This analysis shows that the reducti on varies both with the season and with the single-scattering albedo of the dust particles. The experiments show that dust radiative forcing can lead to significant changes both in the soil dust cycle and in the climate state . To estimate dust concentration and radiative forcing by dust more accurat ely, dust size distributions and dust single-scattering albedo in the model should be a function of the source region, because dust concentration and the climate response to dust radiative forcing are sensitive to dust radiat ive parameters.