关键词: 沙尘湿沉降, 参数化, 模拟试验

Abstract: Based on studying the domestic and international theory of dust sand aerosol's wet deposition, and considering both the physical mechanism and practicability, we designed a parameterized scheme for dust sand aerosol's wet deposition, which takes the pulling effects by both rain and snow into consideration.And we introduced this scheme into the dust sand model.Taking a dusty weather process as a test example, which was accompanied by precipitation and appeared in the northwestern part of China in April 2003, we carried out simulated numerical comparison tests using the parameterized scheme(in one test we considered the precipitation factor and the other we didn't), analyzing and discussing the influence of wet deposition on space distribution of dust aerosols.In addition, we also performed two different schemes of susceptibility tests on rain cleansing.The result is: Over the precipitation area, the wet deposition caused by the precipitation pulling effect had a relatively noticeable influence on the distribution of dust sand aerosols.And this influence was found in the atmosphere from surface all the way to the low troposphere.As the precipitation level was relatively low, the wet deposition had almost the same effect as that of the dry deposition over the same area.

Key words: dust wet deposition, parameterization, simulative test