敦煌地区气溶胶光学厚度的反演研究

1999年，敦煌遥感卫星辐射校正场开始业务化运行。随着敦煌的城市建设和经济发展，辐射校正场周边环境发生较大的变化。为了了解辐射场的气溶胶光学厚度变化情况，2013年6月至7月，中国资源卫星应用中心在敦煌地区进行了为期15天的野外观测实验，采用法国CMEL公司研制的太阳分光光度计CE318对敦煌地区的大气进行测量，获得了4天晴空的大气光学数据。反演结果表明敦煌遥感卫星辐射校正场的气溶胶光学厚度日变化和逐日变化情况不大，550 nm处的光学厚度均值在0.3左右，符合遥感卫星辐射定标大气条件。

Retrieval and Analysis of Aerosol Optical Thickness over Dunhuang Region

In 1999, Dunhuang remote sensing satellite radiation calibration station began regular operation. With Dunhuang urban construction and economic development, the radiometric field surrounding has changed. A great field measurement campaign was conducted in Dunhuang site in summer, 2013. The CIMEL sunphotometer was used to measure the optical characterization of atmosphere in Dunhuang, and a lot of data were obtained about atmospheric optics in loud clearing condition of four days. Data from aerosol-bands of sunphotometer were used in a Langley method to determinespectral optical depths ofaerosol. The aerosol optical depth at 550 nm in Dunhuang is about 0.3. The results showed that the aerosol concentration of atmosphere in Dunhuang was small and suitable for in-flight calibration for remote sensing satellite sensors.