海冰微波辐射的数值模式和遥感实验测量

本文用多频段微波辐射计(1.4,3.09,5.4,36 GHz)对辽东湾和渤海湾的海冰热辐射进行了遥感测量。海冰模拟为一层介电强起伏的各向异性的随机介质。求解随机介质的辐射传输方程,得到海冰的辐射亮度温度。数值计算的结果与实验数据进行了比较,并对辐射亮度温度和海冰各种参数之间的函数关系进行了讨论。

Remote Sensing of Sea Ice by Multi-frequency Microwave Radiometers and Numerical Modeling of Radiative Transfer

Since 1987 the thermal emission from sea ice in Liao Dong and Bo Hai Bays has been measured by multi-frequency microwave radiometers designed by Changchun Institute of Geography, Academia Sinica. The relationship between dualpolarized brightness temperature and some related parameters, such as sea ice thickness, salinity, temperature, etc., has been experimentally obtained. To quantitatively understand the functional dependence of brightness temperature on those parameters and frequency, polarization, etc., we have developed a numerical modeling of radiative transfer for a layer of sea ice, which is modeled as alayer of strongly-fluctuating, anisotropic, random medium. The average dielectric permittivitp of the random medium is calculated by the empirical analytic formulations. Then, the radiative transfer equation for this model is numerically solved by using the discrete-ordinate and eigenana-lysis method. Numerical results are favorably compared with the experimental measurements. The functional relationship between the brightness temperature and various parameters are quantitatively discussed.