沙漠地区沙尘气溶胶含量变化的原因分析

Reason analysis of the dust aerosols’ content change in desert regions

利用中国大陆气溶胶指数(TOMS AI)、太阳辐射、沙尘能见度、降水量等观测资料,对中国西北部沙漠地区沙尘气溶胶含量进行分析.结果表明,沙漠地区AI值不但取决于沙尘暴的发生,而且取决于太阳辐射.这表明沙尘暴起沙模型和尘卷风与干热对流的联合起沙模型互为补充,沙漠地区上空的沙尘气溶胶含量是它们共同作用的结果,而由太阳辐射引发的尘卷风与干热对流较沙尘暴过程更为重要.

Analysis of the content of dust aerosols in desert regions based on the TOMS aerosol index （AI） as well as solar radiation、dust storm frequency and precipitation was deducted. The AI of desert regions depended not only on dust storms but also on solar radiation. Content of dust aerosols in desert regions were based on the combined effect of sand model and dust devilconvective plume model, and the latter might be more important.