遥感试验数据确定大气气溶胶类型的方法研究  

Study on Method for Determining Atmospheric Aerosol Type Using Remote Sensing Experimental Data

作　　者：胡方超[1,2] 王振会[1,2] 张兵[3] 李俊生[3] 

机构地区：[1]南京信息工程大学江苏省气象灾害重点实验室,江苏南京210044 [2]南京信息工程大学大气物理学院,江苏南京210044 [3]中国科学院对地观测与数字地球科学中心,北京100190

出　　处：《中国激光》2009年第2期312-317,共6页Chinese Journal of Lasers

基　　金：国家973计划(2006CB403705);中国科学院知识创新重大项目(KZCX1-YW-14-2);江苏省高校自然科学基础研究项目(08KJB170003)资助课题

摘　　要：以太湖为研究区,通过水面光谱实验采集,地基太阳光度计大气测量,和当天的MODIS遥感影像,联合遥感太湖地区的大气光学特性,提出了一种实验确定气溶胶类型的方法。通过与卫星影像准同步的地面光谱和太阳光度计试验,利用辐射传输模式6S,变化气溶胶类型各组分,建立关于星上辐射的查找表,并利用定义的相对误差参量,在其总误差最小时确定气溶胶类型。将其用于改进后的Mie散射程序来计算大气气溶胶粒子群包括偏振散射相函数等的光学特性,并用于太湖地区大气气溶胶光学厚度的反演中,所得结果参考CE318实测值,反演精度有了较大的提高。该研究方法与结果可为大气气溶胶光学特性计算,大气辐射传输方程,气溶胶光学厚度反演,卫星数据大气校止等遥感应用提供支持。The Taihu Lake is selected the study area. By collecting water surface spectral data of analytical spectral devices （ASD） by the ship, atmospheric data of CE318 sunphotometer on the shore, and the moderate resolution imaging spectroradiometer （MODIS） image data on the same day, the data were used to get optical properties of atmosphere in the study area. A method based on measurements for determining the aerosol type is presented. By using the nearly synchronous measurements of the data from surface spectrum and the sunphotometer with the image, using the radiative transfer model 6S （second simulation of a satellite signal in the solar spectrum）, and varying the components of the aerosol type, a look-up table （LUT） is made for the radiance on the satellite. When the total relative error of the defined parameter for relative error gets to the least, the aerosol type is decided. It has been used to get the optical characteristics including polarized phase function of the poly-disperse aerosols by the improved Mie code. The aerosol type is used to retrieve the aerosol optical depth （AOD） in Taihu Lake area, and its retrival accuracy has been improved a lot compared to the measured value from CE318. The method and results will be provided for the supporting of the remote sensing applications, such as the atmospheric optical properties, the radiative transfer calculation, the retrieval of AOD, and the atmospheric correction.

关 键 词：大气光学 气溶胶类型 太阳光谱的卫星信号二次模拟 CE318 中分辨率成像光谱仪 气溶胶光学厚度 

分 类 号：O436[机械工程—光学工程]