气溶胶大气辐射校正区域性分析

Analysis of regional aerosol in atmospheric radiation correction

针对使用6S模型中标准气溶胶模型进行大气辐射校正时结果较差的问题,该文提出使用实测气溶胶模型代替其进行计算。利用AERONET数据产品分析了香河、榆中等部分站点的气溶胶成分及其区域性分布特点,证明了中国气溶胶的成分具有明显的区域特性;并对6S模型中标准气溶胶模型与香河地基观测气溶胶光学参数进行比较,结果表明,两者具有较大的差异;最后使用不同的气溶胶模型校正Landsat5TM影像,结果表明,采用实测气溶胶数据进行大气辐射校正结果较优。

Aiming at the problem that the precision of atmospheric radiation correction is low when u- sing the standard aerosol models in 6S, this paper proposed to use the measured aerosol data in correction instead of standard aerosol models. Data products from NASA and AERONET were used, such as the sites of Xianghe, SACOL etc. Then the aerosol composition and the characteristic of their regional distri- bution were analyzed, it proved that Chinese aerosol composition had obvious regional characteristics. In addition, it compared the aerosol optical parameters between the standard aerosol models in 6S and the ground-based observations aerosol model in Xianghe, and the results showed that there was a great differ- ence. Finally, different aerosol models were used to correct the Landsat5 TM images, and the results showed that it was better to choose the measured aerosol data in atmospheric radiation correction.