Studies On Polarimetric Emissivity Of Wind-roughened Sea Surfaces

The polarimetric emissivity of the sea surface plays an extremely important role in studies on geophysics and interactions between ocean and atmosphere. The detection of the sea surface emissivity and polarimetric brightness temperature is useful in studies on sea temperature and ocean climate, so accurate simulation in polarimetric radiation of the wind-roughened sea surface is full of scientific value and practical significance in oceanography, marine remote sensing studies, interpreting of interactions between land and ocean, weather forecasts etc.Comparing with microwave remote sensing, infrared remote sensing of wind-roughened sea surface emissivity has higher resolution and more mature theory. It is very important to fix a simple and accurate model of emissivity. There are two emissivity models in microwave remote sensing, including indirect and direct emission emissivity model correspond to gravity waves and capillary waves. It very complicated in computation when we unit two models together for accurate simulation, therefore we need to improve solutions and using geometrical optical specular model will be useful.In this thesis we mainly investigated the following: First of all, method of statistical description of the wind-roughened sea surface wsa introduced and definitions of parameters were given. Incidentally, we introduced sea spectrums and slope distribution probability density function. Secondly, we studied Kirchhoff's law, Planck's law, Fresnel formula which closely related with the ocean remote sensing and introduced passive remote sensing models of rough sea surface, including direct and indirect models and relative knowledge.At last geometrical optical specular model was used to calculate sea surface brightness temperatures under consideration of characteristics of infrared remote sensing and compared with microwave remote sensing of wind-roughened sea surface.