The Impact of Convective Transport and Wet Deposition of Airborne Dust Particles on the Numerical Simulation of Northeast Asian Storms

The main concerns of this paper are the effects of sub- grid convection and wet deposition on dust distribution in the atmosphere. A theoretic framework and a numerical scheme are developed for parameterization of convective dust transport. A new parameterization scheme for wet deposition arising from below cloud scavenging is also developed. The new convective dust transport scheme and wet deposition scheme are coupled with IWEAPS (the integrated wind erosion assessment and prediction system) which is then applied to simulation the two Asian dust events in March 2002. The impacts of convective transport and wet deposition on dust concentration are examined through sensitivity experiments and comparison with measurements. The model results show the importance of wet deposition in the quantitative prediction of dust concentration for Asian dust events.