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- W2092837634 abstract "A size‐segregated aerosol model that includes most of the major physical processes (generation, transport, and dry and wet deposition) is developed. This model is coupled with a Regional Air Quality Model (RAQM) and is applied to simulate Asian dust storms during the 10‐day period of 15–24 March 2002. A nonhydrostatic mesoscale model (MM5) is used to provide meteorological fields. Model results are verified by available observational data including surface weather observations and size‐segregated particle concentrations. The validation demonstrates a good capability of this model system in capturing most of the key features of dust evolution and reproducing the particle mass size distribution along the transport pathway of soil dust. An apparent feature has been both observed and reproduced by the model, showing a shift of size range with peak mass concentration from coarse mode to finer mode on the pathway from source regions to distant downwind areas. The maximum dust concentration averaged over 10 days is simulated to be 3000 μg m −3 over the southern China‐Mongolia border. Total dry deposition of soil dust for 10 days is up to 30 g m −2 in the Gobi desert along the southern China‐Mongolia border. Distribution and magnitude of particle deposition are strongly dependent on both concentration and size‐segregated dry deposition velocity and scavenging rate. While dry deposition dominates the removal of dust particles in or in the vicinity of source regions, the influence of wet deposition increases along the transport pathway of soil dust, with high removal efficiency for coarser particles (>2 μm) and very low efficiency for particles in the accumulation mode. Of the total dust emission (43.2 megatons), about 71% is redeposited onto the underlying surface by the dry deposition process, 6% is removed by the wet deposition process, and the remaining 23% is suspended in the atmosphere or subject to long‐range transport." @default.
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- W2092837634 date "2004-10-12" @default.
- W2092837634 modified "2023-10-14" @default.
- W2092837634 title "Model study on particle size segregation and deposition during Asian dust events in March 2002" @default.
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- W2092837634 doi "https://doi.org/10.1029/2004jd004920" @default.
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