基于MODIS数据产品的桂林市气溶胶时空分布及变化特征分析

利用MODIS 3 km AOD原始数据,借助ENVI、Arc GIS等软件对桂林市AOD进行提取和插值,模拟该市AOD的空间分布特征,综合分析区域地形、NDVI与AOD分布的相关关系。结果表明:桂林市AOD空间分布受到地形的影响,AOD高值区出现在近乎封闭的桂林中部盆地和其他区域的谷地,地势高的区域AOD值较低;利用NCEP分析资料的风场数据,对比春节期间桂林市的AOD相对高值中心的变化,得出气溶胶的迁移和扩散方向与风向一致,静风时AOD相对高值中心更容易集中在中部盆地的城区。

Analysis of Temporal and Spatial Distribution and Variation Characteristics of Aerosol in Guilin Based on the MODIS Data

In this article, the spatial distribution of AOD in Guilin was simulated and the relationship between terrain, NDVI and AOD was analyzed based on MODIS C006 3 km AOD original data extracted and interpolated by ENVI, ArcGIS and other software. The results showed that the terrain in Gulin had deep effect on AOD spatial distribution. High AOD areas appeared in the closed middle basin of Guilin and other valleys. Low AOD area appeared in high terrain. According to the wind field data reanalyzed by NCEP, and the variation of the relative high AOD centre in the Spring Festival, it was concluded that the direction of aerosol migratory and diffusion was consistent with the wind direction, while in calm wind, the relative high AOD centre mainly occurred in the middle basin of the urban area.