Study on the applicability of key parameters from dust emission scheme in WRF/Chem over northwestern China

Abstract In order to more accurate quantitative simulation and forecast of sandstorm in northwest China, in this paper, the dust process occurred in northwest China was simulated by using the WRF/Chem model coupling of Shao2004 dust emission parameterization scheme. The influence of key parameter C in Shao2004 scheme is analyzed set at different values on simulated spatial and temporal dust concentration, estimated vertical dust flux and estimated PM 10 and PM 2.5 concentration of six stations in northwest China. And by comparing the concentration of PM concentration observed at the sites, the results were listed as: Parameter C has an significant influence on the simulation dust scope and maximum center value of dust concentration and vertical dust flux; Different C values can well simulate the variation trend of PM 10 and PM 2.5 concentration in dust weather, but only when the C value set as 1, this model can more accurately simulate the change of PM 10 and PM 2.5 concentration in the dust process in northwest China.