The Effects of Clouds on Aerosol and Chemical Species Production and Distribution. Part III: Aerosol Model Description and Sensitivity Analysis

摘要: A modeling study of the effects clouds on evolution and redistribution aerosol particles in troposphere is presented. two-mode, two-moment model coupled with a two-dimensional, mixed-phase, microphysics, Eulerian cloud sulfate chemistry model. The used to simulate convective different assumptions about initial chemical fields. In simulations, SO convectively transported mid- upper troposphere, where it oxidized gas-phase H 2 4 . After processing, condensation nuclei (CCN) are removed by precipitation graupel form CCN-depleted region above top cold humidified outflow region. These conditions favorable for binary homogeneous nucleation ultrafine sulfuric acid take place. new particle formation interacts processing transport produces peak small concentration Sensitivity tests varying composition mass mixing ratio, assumed OH. profile, rate factor discussed. particie most sensitive profile. When increased, critical (g) lowered, rare adjusts changes environmental variables more quickly. results suggest that both aerosols precursors can be into clouds, affecting vertical profiles concentrations.