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The emissivity of foam-covered water surface at L-band: theoretical modeling and experimental results from the FROG 2003 field experiment
Rodríguez, R; Monerris Belda, Alessandra; Sabia, Roberto; Miranda Mendoza, Jorge José; Camps Carmona, Adriano José; Vall-Llossera Ferran, Mercedes Magdalena; Villarino Villarino, Ramón; Reul, N; Chapron, B; Corbella Sanahuja, Ignasi; Duffo Ubeda, Núria; Torres Torres, Francisco
Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions
Sea surface salinity can be measured by microwaveradiometry at L-band (1400–1427 MHz). This frequency is acompromise between sensitivity to the salinity, small atmosphericperturbation, and reasonable pixel resolution. The descriptionof the ocean emission depends on two main factors: 1) the seawater permittivity, which is a function of salinity, temperature,and frequency, and 2) the sea surface state, which depends on thewind-induced wave spectrum, swell, and rain-induced roughnessspectrum, and by the foam coverage and its emissivity. This studypresents a simplified two-layer emission model for foam-coveredwater and the results of a controlled experiment to measure thefoam emissivity as a function of salinity, foam thickness, incidenceangle, and polarization. Experimental results are presented, andthen compared to the two-layer foam emission model with themeasured foam parameters used as input model parameters. At37 psu salt water the foam-induced emissivity increase is 0.007per millimeter of foam thickness (extrapolated to nadir), increasingwith increasing incidence angles at vertical polarization,and decreasing with
2012-05-11
Àrees temàtiques de la UPC::Enginyeria electrònica i telecomunicacions
Àrees temàtiques de la UPC::Enginyeria electrònica i telecomunicacions::Radiocomunicació i exploració electromagnètica
Brightness temperature
Microwave remote sensing
Signal theory (Telecommunication)
Microones -- Mesurament
Senyal, Teoria del (Telecomunicació)
Oceanografia
Open Access
Article
IEEE Press. Institute of Electrical and Electronics Engineers
         

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