不同天顶角下渤海自然平整海冰的辐射特征  

Angular dependence of the characteristics of radiation characteristics of sea ice in Bohai Sea

作　　者：刘成玉[1] 顾卫[1] 李澜涛[1] 

机构地区：[1]北京师范大学地表过程与资源生态国家重点实验室,北京100875

出　　处：《海洋环境科学》2013年第3期353-356,共4页Marine Environmental Science

基　　金：国家高技术研究发展计划863项目(2011AA100505);地表过程与资源生态国家重点实验室项目(2010-TD-02;2011-TDZD-050)

摘　　要：准确地掌握地物的比辐射率在2π空间内的变化特征是精确地利用热红外遥感技术反演地表温度的重要前提。以不同厚度不同内部结构的渤海自然平整海冰为研究对象,利用TH3102 MR型热红外成像仪测量了自然平整海冰在不同观测天顶角下(0～80°,间隔10°)的辐射亮温,并将辐射亮温转换成辐射亮度,根据辐射亮度计算了每个测量样品相对于法向比辐射率(0°观测天顶角)的相对比辐射率。结果表明,相对比辐射率基本上随着观测天顶角的增大而减小,当观测天顶角大于50°时,相对比辐射率迅速减小。自然平整海冰的厚度和内部结构并不会影响相对比辐射率的变化特征。It is important a precondition to master the variation of the emissivity in the 2π space veraciously for inversing the temperature of surface ground accurately.In this study,the natural-flat sea ice with different thickness and different internal structure has been taken as research object,and the brightness temperatures of the sea ice samples have been measured under different zenithal angles from 0 to 80 with an increment of ten degrees.The brightness temperatures have been converted into radiances,and the relative emissivity of the sea ice samples has been calculated.The results show that the relative emissivity is decreasing when the viewing zenithal angle increases.The relative emissivity is decreasing rapidly as the viewing zenithal angle less than 50.The thickness and different internal structure of sea ice has no effect on the variation of relative emissivity of the sea ice.

关 键 词：观测天顶角 自然平整海冰 相对比辐射率 

分 类 号：TP751.1[自动化与计算机技术—检测技术与自动化装置]