Effective dielectric constant model of electromagnetic backscattering from stratified air–sea surface film–sea water medium  

作　　者：谢涛 William Perrie 方贺 赵立 于文金 何宜军 

机构地区：[1]School of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing 210044, China [2]Jiangsu Engineering Technology Research Center of Marine Environment Detection, Nanjing 210044, China [3]Fisheries & Oceans Canada, Bedford Institute of Oceanography, Dartmouth, Nova Scotia, B2Y4A2 Canada

出　　处：《Chinese Physics B》2017年第5期120-125,共6页中国物理B（英文版）

基　　金：Project supported by the National Key Research and Development Program of China(Grant No.2016YFC1401007);the Global Change Research Program of China(Grant No.2015CB953901);the Canadian Program on Energy Research and Development(OERD);the Office of Naval Research(Code 322,“Arctic and Global Prediction”(Principal Investigator:William Perrie))(Grant No.N00014-15-1-2611);the National Natural Science Foundation of China(Grant No.41276187)

摘　　要：Studies of surface film medium on the sea surface are carried out in this paper for developing the technology to automatically detect and classify sea surface films, and an effective dielectric constant model of electromagnetic backscattering from a stratified air–ocean interface. Numerical results of the new model show the characteristics of effective dielectric constants for the air–sea surface film–sea water medium as follows. The effective dielectric constants decrease with increasing relative dielectric constants of the sea surface films. The effective dielectric constants decrease in horizontal polarization（abbr. HH polarization） and increase in VV vertical polarization（abbr. VV polarization） with increasing radar incident angle. Effective dielectric constants vary with relative sea surface film thickness as a cosinusoidal function of sea surface film thickness. Effective dielectric constant of VV polarization is larger than that of HH polarization. Two potential applications are found with our model, i.e., the retrieval of dielectric constants from the sea surface film, and the film thickness retrieval with our model. Our model has a highly significant influence on improving the technology related to the remote sensing of sea surface films.Studies of surface film medium on the sea surface are carried out in this paper for developing the technology to automatically detect and classify sea surface films, and an effective dielectric constant model of electromagnetic backscattering from a stratified air–ocean interface. Numerical results of the new model show the characteristics of effective dielectric constants for the air–sea surface film–sea water medium as follows. The effective dielectric constants decrease with increasing relative dielectric constants of the sea surface films. The effective dielectric constants decrease in horizontal polarization（abbr. HH polarization） and increase in VV vertical polarization（abbr. VV polarization） with increasing radar incident angle. Effective dielectric constants vary with relative sea surface film thickness as a cosinusoidal function of sea surface film thickness. Effective dielectric constant of VV polarization is larger than that of HH polarization. Two potential applications are found with our model, i.e., the retrieval of dielectric constants from the sea surface film, and the film thickness retrieval with our model. Our model has a highly significant influence on improving the technology related to the remote sensing of sea surface films.

关 键 词：dielectric retrieval constants automatically classify stratified ocean imaginary incident layered 

分 类 号：X87[环境科学与工程—环境工程]