不同融化状态雪的偏振特性分析  

Analysis of the Polarization Properties of Snow in a Different Melting State

作　　者：张丽莉[1] 赵云升[1] 张霞[1] 孙天琳[1] 梁壬凤[1] 刘洁[1] 

机构地区：[1]东北师范大学城市与环境科学学院,吉林长春130024

出　　处：《光谱学与光谱分析》2013年第1期182-185,共4页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(40971190;40771153)资助

摘　　要：在当今全球变暖的形势下,传统对于固态雪的研究已无法满足需求,文章定性分析了不同融化状态雪的偏振反射光谱,重点探讨了偏振角、方位角、光线入射天顶角和探测天顶角与不同融雪类型的关系,发现这些因素对不同融雪类型的偏振反射光谱均有影响。在可见光波段,融雪在90°偏振时的反射比最大,0°偏振时最小;探测角与入射角越大时,融雪的偏振反射比也越大;不同方位角时的融雪偏振反射光谱出现异于其他地物光谱的反常现象;某些波段的偏振光谱特征对判断融雪含水量大小具有一定意义;同时随着含水量的增加偏振反射比显著下降。这些规律为以后利用偏振光谱定量分析融雪特性奠定了基础,同时在淡水资源管理和监测春汛等自然灾害方面也有一定的现实意义。Nowdays,under the circumstance of global warming,the traditional study of solid-state snow can not meet the current needs.The present paper involves qualitative analysis of the polarization reflectance spectrum of snow in a different melting state.Special attention is paid to the investigation of the relationship among polarization angles,azimuth angles,the light incidence zenith angles,the detection zenith angles and the different types of snowmelt.It turns out that all these factors have certain influences on the polarization reflectance spectrum of different types of snowmelt.At the waveband of the visible light,the polarization reflectance of snowmelt is the largest at 90°,and the smallest at 0°.The wider the detection angles and the incidence angles,the larger the polarization reflectance.Anomalies（unusual phenomena）,different from other spectra,occur when the polarization reflectance spectrum of snowmelt is observed at different azimuth angles.The characteristics of polarization spectra at some certain wavebands play an important role in determining the water content of snowmelt,and meanwhile with the increase of which,the polarization reflectance will go down obviously.These rules have laid a solid foundation for the quantitative analysis of snowmelt properties by using polarization spectrum in the future and are also of great importance in fresh water management as well as monitoring natural disasters such as the spring flood.

关 键 词：融雪 偏振反射比 光谱 波段 

分 类 号：TP72[自动化与计算机技术—检测技术与自动化装置]