中国东部和西部地区MODIS Level-3气溶胶光学厚度检验及其变化趋势

摘要

为了更好地掌握中分辨率成像光谱仪 (moderate-resolution imaging spectroradiometer, MODIS) Level-3反演精度和气溶胶光学厚度 (aerosol optical depth, AOD) 变化趋势, 选取区域代表性较好、观测时间序列较长的AERONET站, 结合2003—2016年MODIS同期观测资料, 对北京、香河、太湖、兰州以及纳木错地区MODIS的反演精度进行评价, 并在此基础上对MODIS适用性较好的北京、香河和太湖地区AOD的年际变化特征进行了分析.研究结果表明, MODIS Level-3AOD产品反演精度主要受不同地区下垫面条件影响, 在北京、香河地区反演精度较好, 为研究区域长时间AOD变化特征和趋势提供了帮助.%To better understand (moderate-resolution imaging spectroradiometer, MODIS) Level-3 retrieval accuracy and (aerosol optical depth, AOD) trends, AERONET dataset from Beijing, Xianghe, Taihu, SACOL and NAMCO sites which had good regional representative and long-term observation were selected to evaluate the MODIS retrieval, combined with MODIS data during the same period from 2003 to 2016.Based on the MODIS AOD validation, the interannual variability of AOD were analysed in Beijing, Xianghe and Taihu, where had higher MODIS retrieval accuracy.The result of this study indicates that the accuracy of MODIS Level-3 AOD is mainly affected by the underlying surface condition.Good retrieval accuracy is found in Beijing and Xianghe, which is helpful to study the characteristics and trends of long-term AOD in the area.