卷云多角度偏振特性研究  

Multi-angular polarized characteristics of cirrus clouds

作　　者：程天海[1] 顾行发[1] 陈良富[1] 余涛[1] 田国良[1] 

机构地区：[1]中国科学院遥感应用研究所遥感科学国家重点实验室

出　　处：《物理学报》2008年第8期5323-5332,共10页Acta Physica Sinica

基　　金：国家高技术研究发展计划(批准号:2006AA06A303);国家自然科学基金(批准号:40701109);中国科学院知识创新工程重要方向性项目(批准号:KZCX2-YW-303)资助的课题~~

摘　　要：由各种形状冰晶粒子组成的卷云,对全球辐射平衡和气候变化有重要的影响,其影响程度取决于卷云本身的微物理特性和光学特性,如冰晶粒子形状、卷云光学厚度和云顶压强等.在对0.865μm波长处卷云光学特性研究的基础上,采用矢量辐射传输方程模拟分析了含卷云层的总反射率和偏振反射率,并利用卫星观测数据验证了模拟结果.分析研究了卷云微物理特征、光学特征和地表反照率对总反射率和偏振反射率的影响.分析表明,可以综合利用多角度偏振遥感信息反演各种卷云参数.这为利用多角度偏振遥感数据反演卷云各参数提供了理论基础.Cirrus is mainly composed of non-spherical ice crystals in various shapes and plays an important roles in Earth＇s radiation budget and global climate change.Knowledge of cirrus properties is crucial for studying the radiation budget and climate change.Thus studies of the optical,microphysical,and physical properties of cirrus have become the popular issue.The optical properties of cirrus at 0.865μm are studied.And the reflectance and polarized reflectance are evaluated with the adding-doubling method by solving the vector radiative transfer model,and the sensitivity of reflectance and polarized reflectance to cirrus optical parameters and surface albedo are evaluated.The results indicate that the polarized reflectance over a large range of scattering angles can show the information of cirrus properties.Based on the studies of the sensitivity,the basic theory of using the remote sensing data of multi-angular polarized measurements to retrieve the properties of cirrus is proposed.

关 键 词：卷云微物理特征 卷云光学特性 多角度偏振辐射 矢量辐射传输方程 

分 类 号：P426.51[天文地球—大气科学及气象学]