Research on the Thermal Infrared Polarization Properties of Fresh Snow
WANG Ting-ting1,2,4, LI Zhao-liang3, TANG Bo-hui1,4, SUN Wei-qi2, ZHAO Yun-sheng2*
1. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China 2. College of Geography Science, Northeast Normal University, Changchun 130024, China 3. Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China 4. University of Chinese Academy of Sciences, Beijing 100049, China
Abstract：Snow can directly affect the surface energy balance and climate change and has a significant impact on human life and production. It is therefore of great significance to study the fresh snow emission spectroscopy properties by using the thermal infrared Polarization technique. This can provide a basis for quantitative thermal infrared remote sensing monitoring of snow as well as a deeper understanding of global warming and appropriate countermeasures. This paper focuses on the investigation of the thermal infrared polarization properties of the fresh snow. The results show that the thermal emissive polarization properties of fresh snow depend significantly on the wavelengths (channels) and view angles used to measure them. Four channels are considered in this study, their spectral response ranges are 8~14 μm for channel 1 (CH1), 11.5~12.5 μm for channel 2 (CH2), 10.3~11.5 μm for channel 3 (CH3) and 8.2~9.2 μm for channel 4 (CH4). The snow polarized radiance (L) and its polarized brightness temperature (T) manifest as LCH1>LCH3>LCH4>LCH2 and TCH4>TCH1>TCH2>TCH3, respectively, while the degree of polarization (P) manifests as P0>P30>P40>P20>P10>P50 where the subscript of P denotes the view angle. The maximum of both L and T occurs at the view angle of 50 degree and polarization angle of 90 degree while their minimum appears at the view angle of 30 degree and polarization angle of 75 degree for each channel. In addition, the results show that: CH3 is more appropriate for better investigation of the emissive polarization properties of snow. Linear relationship is found between the fresh snow polarized T and the polarization angle with the coefficient of determination larger than 0.77 for all four channels. The polarized brightness temperature of the fresh snow is found to be increased about 0.003 K per polarization angle within 0~135 degree. The degree of polarization of snow is almost independent of the channels we used (CH1 to CH4). The snow emissive polarization is isotropic and the relative azimuth view angle has no significant impact on the snow emissive polarization properties. The impact of the polarization angle may be neglected if the investigation of the relative azimuth view angle on the fresh snow thermal emissive polarization is conducted. The difference of the fresh snow emissive polarization properties mainly comes from the snow surface roughness and structure.
王婷婷1,2，4, 李召良3，唐伯惠1，4, 孙玮琪2，赵云升2* . 新雪的热红外偏振特性研究 [J]. 光谱学与光谱分析, 2015, 35(07): 1848-1853.
WANG Ting-ting1,2,4, LI Zhao-liang3, TANG Bo-hui1,4, SUN Wei-qi2, ZHAO Yun-sheng2* . Research on the Thermal Infrared Polarization Properties of Fresh Snow . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2015, 35(07): 1848-1853.
