| 光谱学与光谱分析 |
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| Study on the Thermal Radiation Polarization Characteristics of Ice |
| WANG Ting-ting, ZHAO Yun-sheng, ZHANG Hong-yan*, ZHANG Xia，ZHANG Li-li |
| College of Geography Science, Northeast Normal University, Changchun 130024, China |
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Abstract As an important parameter of the global energy balance, climate, hydrological and ecological model, ice directly affects the energy balance of the earth-atmosphere system, weather and climate. It is of great significance to use the thermal infrared polarization technology to study ice thermal radiation. For the ice monitoring and the impact of global climate change on the ice, studies on ice thermal radiation polarization characteristics were conducted based on the wavelength, detection angle and azimuth angle. The results show that the wavelength has an obvious impact on the ice thermal radiation polarization properties. The polarized radiance of four bands shows that LCH1>LCH3>LCH4>LCH2 while the polarization brightness temperature shows that TCH4>TCH1>TCH2>TCH3. It’s better to use the brightness temperature of the third channel than the radiance to study the thermal radiation polarization. The detection angle affects the ice thermal radiation polarization characteristics greatly and there are some differences between the polarization angles. The brightness temperature of ice is the lowest in the detection angle of 10° and the polarization angle of 30°, which are non-accidental factors. These was closely related to ice physical and chemical properties. The degree of ice polarization performance shows that P0<P40<P30<P50<P10<P20 and is affected by the detection angle, which is directly related to the differences in the brightness temperature at different polarization angles. The degree of polarization changes with the azimuth angles and plays an important role in ice physical and chemical characteristics monitoring. The impact of azimuth angle on the ice thermal radiation polarization characteristics was not significant. And it is affected by the roughness of the surface, organizational structure and other factors which are direct results of ice emitted radiation at different azimuth angles.
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Received: 2013-04-16
Accepted: 2013-06-29
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Corresponding Authors:
ZHANG Hong-yan
E-mail: zhy@nenu.edu.cn
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