项目名称: 雪粒径对雪的高光谱偏振反射特性影响机理研究
项目编号: No.41201343
项目类型: 青年科学基金项目
立项/批准年度: 2013
项目学科: 地理学
项目作者: 吕云峰
作者单位: 长春师范大学
项目金额: 25万元
中文摘要: 雪粒径是控制反照率的主要参数,也是影响全球辐射平衡的因素之一,雪粒径的时空分布又是融雪径流模型、雪化学模型及气候模型的输入参数。作为高纬度地区的典型地物,伴随着较大的太阳入射角度,雪粒径的变化使雪表反射的各向异性特征变化更明显,同时也使得反射中包含的偏振信息增加,尤其是在前向散射方向和后向散射方向。本项目以不同粒径的积雪表面为研究对象,利用地物光谱仪和偏振测试平台测量雪在2π空间的高光谱偏振反射信息,并以辐射传输理论、菲涅尔反射折射理论和斯托克斯散射参数与入射辐射场之间的关系为理论依据,分析雪粒径对偏振反射的影响机理;同时将偏振信息与现有的BRDF模型结合可以详细地解雪的辐射传输过程,使得遥感技术反演雪粒径的信息来源更加丰富,也为大气反演中剥离地表(积雪)偏振影响提供参照。
中文关键词: 高光谱遥感;偏振遥感;多角度遥感;;
英文摘要: Snow grain size is a main parameter of controlling albedo, one of the factors of affect global radiation balance, and its spatiotemporal distribution is an input parameter of snowmelt runoff models, chemical models and climate models. As a typical feature of high latitudes, the change of snow grain size, along with the sun increases incident angles, makes snow reflection characters vary more evidently, and increases polarization information included in reflected light rays, especially in forward scattering and back scattering.The project, whose research object is the snow surface consisting of snow grains of different sizes, measures hyper spectral polarization reflection information in 2πspace by means of field spectroradiometer and polarization test platform, and analyzes the influential mechanism of snow grain sizes to polarization reflection on the basis of radiative transfer theory, Fresnel reflection refraction theory and the relationship between Stokes scattering parameters and incident radiation field. It combines polarization information with BRDF models, so as to study radiative transfer process in detail, enrich the sources of snow grain size information demonstrated by remote sensing technology, and provide a reference for detaching earth's surface (snow) polarization from atmospheric retrieval.
英文关键词: Hyperspectral Remote Sensing;Polarization Remote Sensing;Multi-angle remote sensing;;