The Study Of Whitecap' Effect To Modes Of Microwave Remote Sensing Under High Oceanic Situation

The traditional modes on microwave remote sensing are almost used in the interface of sea-air under low oceanic situation. But with strong wind , whitecap created by breaking of ocean wave which is an intense scattering source changes the dielectric character of sea surface and character of it's scatter and emissivity correspondingly . Using method of effective medium approximation , spheric or complex particulates distributing even in the air background medium is regard as the equivalent of whitecap in this paper . The introduction of whitecap-covered percentage and it's relations with effective dielectric constant and depth of whitecap make physical model press close to realism. Employing scattering modes of Kirchhoff approximation and two-scale randomly rough surface in active remoter sensing and physical definition about emissivity in passive remote sensing , the relations of between backscattering cross , effective emissivity and polarization , incident angle , wind speed and whitecap-covered percentage are calculated and show the degree of whitecap affect microwave remote sensing. Numerical results are well compared with experimental measurements and remote sensing data and accord with them better than existing models . Especially under the high wind speed , the trends of numerical results and real data of backscattering cross and effective emissivity change with wind speed are consistent and more logical. This model can truly materialize the effect of exist of whitecap to the modes of microwave remote sensing.