利用分裂窗通道比辐射率遥感判识沙尘气溶胶研究  

The Research on Remote Sensing Dust Aerosol by Using Split Window Emissivity

作　　者：徐辉[1,2] 余涛[1] 顾行发[1] 程天海[1] 谢东海[1] 刘倩[3] 

机构地区：[1]中国科学院遥感应用研究所国家重点实验室,北京100101 [2]中国科学院研究生院,北京100049 [3]国家基础地理信息中心,北京100089

出　　处：《光谱学与光谱分析》2013年第5期1189-1193,共5页Spectroscopy and Spectral Analysis

基　　金：国家(973计划)项目(2010CB950800);中国科学院战略性先导专项气溶胶时空分布遥感观测课题项目(Y1Y02200XD);中国科学院创新项目(09Y01500KB)资助

摘　　要：在沙尘气溶胶辐射强迫的影响下,卫星传感器在分裂窗通道观测到的地表比辐射率信息会发生变化。首先从微观角度阐述了沙尘气溶胶在11和12μm通道处的消光特性以及它们对比辐射率的影响;其次,以2011年4月29日内蒙古北部地区一次强沙尘天气为例,分析了研究区域内的比辐射率变化特征,并在此基础上提出了一种利用分裂窗通道比辐射率遥感判识沙尘气溶胶的方法;最后,利用国家气象卫星中心对外提供的沙尘日监测产品对沙尘气溶胶识别结果进行了验证和分析。结果表明:在假设12μm比辐射率为1的条件下,利用11μm相对比辐射率不但能够有效的把沙尘覆盖区域识别出来,而且11μm相对比辐射率在一定程度上也反映了沙尘的强度信息。Dust aerosol can cause the change in the land surface emissivity in split window by radiative forcing （RF）. Firstly, the present paper explained from the microscopic point of view the extinction properties of dust aerosols in the 11 and 12μm chan- nels, and their influence on the land surface emissivity. Secondly, on April 29, 2011, in the northern region of Inner Mongolia a strong sandstorm outbroke, and based on the analysis of the changes in land surface emissivity, this paper proposed a dust iden- tification method by using the variation of emissivity. At last, the dust identification result was evaluated by the dust monitoring product provided by the National Satellite Meteorological Center. The result shows that under the assumption that the 12 μm emissivity equals to 1, using 11 μm relative emissivity could identify dust cover region effectively, and the 11 μm relative emis- sivity to a certain extent represented the intensity information of dust aerosol.

关 键 词：沙尘气溶胶 红外分裂窗 比辐射率 沙尘识别 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]