关键词: WRF-chem模式, 沙尘源, 沙尘输送, 位涡, 辐射

Abstract: Based on the WRF-chem model coupled Shao04 parameterization scheme, a typical cold vortex dust process in Inner Mongolia in spring of 2015 was studied. The WRF-chem model can better describe the horizontal and vertical transmission of dust comparing model simulation with Micaps, CALIPSO, PM₁₀ observation data. The sand source is mainly distributed in the south of Mongolia, the north of Inner Mongolia and Otindag Sandy Land. The largest dust emission are 77.4 g·m^-2 and 112.7 g·m^-2 in the south of Mongolia and the north of Inner Mongolia. The dry sedimentation rate of the north of Inner Mongolia and the south of Mongolia is 427.2 μg·m^-2·s^-1 and 253.2 μg·m^-2·s^-1, respectively. The dust load in the north of Inner Mongolia(87.3 g·m^-2) is larger than in the south of Mongolia (41.3 g·m^-2). Because of the dryer soil moisture in Otindag Sandy Land, the dust emission (215.6 g·m^-2), dust load (132.7 g·m^-2) and sedimentation rate (809.3 μg·m^-2·s^-1) are larger than in the south of Mongolia and the north of Inner Mongolia. Under the action of the warm air ascending motion ahead of the front, the dust aerosol can be transported between the upper troposphere and lower stratosphere. Although the high-level dust may have a low concentration, it can be transmitted farther distances. Dust aerosols increase upward longwave radiation at TOA (the top of atmosphere) at night, while heating the atmosphere and increasing the boundary layer height.

Key words: WRF-chem model, sand source, the transportation of dust, potential vorticity, radiation