利用MODIS数据监测北京地区气溶胶

Urban Surface Aerosol Monitoring Using DDV Method from MODIS Data

采用暗像元法对北京地区的气溶胶进行了监测：以2005～2007年的MODIS 1B数据为数据源，使用6S进行辐射传输计算构建查找表，进行气溶胶光学厚度的反演，并使用AERONET数据对结果进行验证，对冬季和夏季的监测结果进行了比较。结果表明，该算法能够较好地监测气溶胶，反映城市气溶胶的区域变化；但冬季时的监测结果要远远差于夏季，很难满足气溶胶监测需求。

Taking Beijing area as an example,the aurban surface aerosol optic thickness has been tried to retrieve using DDV （Dark Dense Vegetation） method from MODIS level1B data. Firstly, the LUT （Look Up Table） is built by 6S, the dark dense pixel is checked based on NDVI and the retrieved AOD （Aerosol Optical Depth） is validated using the CE318 measurements from AERONET （Aerosol Robotic NET- work）. The results show the DDV method can be used to monitor the urban aerosol very well during the summer and autumn in Beijing, but it losses its power in the winter.