Estimation of Dust Deposition for the Yellow Sand event Observed in April 1998 in Korea

Dry and wet deposition of dust is estimated using the resistance method and precipitation rate and averaged dust concentration in cloud water for a Yellow Sand event observed in April 1998. The spatial distribution of the dry deposition of dust dictates that of the dust concentrations rather than dry deposition velocity, however that of wet deposition is different from the distribution pattern of precipitation amount because of its dependency on both the concentration and precipitation amount. In the dust source region, most of dust deposition is contributed by dry deposition with the maximum amount at the large particle sizes due to the large dry deposition velocity and high concentration. Away from the source regions, the maximum deposition occurs at the particle size of 1.73 ~ 9.58 im in radius. The particle size associated with the maximum wet deposition is found to be smaller than that of dry deposition. About 90% of emitted dust is found to be removed by dry deposition, 3% by wet deposition and about 2% being out of the whole analysis domain. The daily mean suspended dust in the air is found to be about 33% of the daily dust emission amount with significant time variations.