摘要：Atmospheric aerosols affect climate directly by scattering and absorbing solar radiation and indirectly by adjusting cloud properties with consequent effects on radiation and precipitation processes. The direct effect is better understood, but the indirect cloud-adjustment effects are highly uncertain due to the complex interactions among aerosols, clouds and meteorology. The talk uses WRF model simulations to illustrate changes in spatial distribution of cloud properties (fraction and microphysics) due to increases in anthropogenic aerosols over East Asia. The responses of surface temperature and precipitation will be presented and discussed in reference to aerosol direct and indirect radiative forcing. Outstanding issues concerning aerosols-clouds-precipitation interactions will be elaborated.