MODIS资料反演AOD及其在区域大气污染监测中的应用

简要给出利用MODIS卫星资料和使用暗目标法反演气溶胶光学厚度的算法和计算流程,并给出该算法在陕西关中一次区域大气污染监测中的应用.同时分析了低层风场对气溶胶光学厚度分布的影响.结果表明:由于关中地区地形的特殊性,污染物的扩散和稀释主要取决于低空风场的变化,不利的低空风场会导致污染物在某一区域范围内堆积,造成该区域污染事件加剧,偏西风有利于关中地区污染物的扩散和稀释.

Retrieval of Aerosol Optical Depth over Shaanxi using MODIS Data and It's Application to an Aerosol Pollution Event

This paper gave the operational arithmetic and flow chart of Dense Dark Vegetation Method which is used to retrieve Aerosol Optical Depth(AOD) with the Moderate Resolution Imaging Spectroradiometer(MODIS),and also gave its use for obtaining the AOD over Guanzhong region of Shaanxi Province during an aerosol pollution on June 9 to 16,2006.In this pollution episode,it was found that there were some relationships between the concentration of the AOD and the burning area of the straws.The augment of the burning area of straws will lead to the increasing of the concentration of AOD.The results also showed that the variation of wind direction at 850 hPa had great influence on the distribution of AOD due to the special landform of Guanzhong region.The adverse wind direction will lead to the accumulation of the pollution at one scale of Guanzhong region.West wind was the most effective to the diffusion and dilution of the concentration of AOD.Wet deposition process of precipitation was also one of the effective ways to reduce the concentration of AOD in Guanzhong region.