Accession Number : AD0740237

Title :   Analytical Studies of Scattering and Emission by the Sea Surface.

Descriptive Note : Final rept. 1 Mar 71-1 Mar 72,

Corporate Author : TRW SYSTEMS GROUP REDONDO BEACH CALIF THEORETICAL PHYSICS GROUP

Personal Author(s) : Wagner,Richard J. ; Lynch,Philip J.

Report Date : MAR 1972

Pagination or Media Count : 71

Abstract : Geometrical optics theories of scattering, transmission, and emission of electromagnetic radiation from two-dimensional, anisotropic, randomly rough surfaces have been formulated which explicitly include the effects of surface shadowing and double scatter. These theoretical developments, which have been fully documented in technical reports issued on this contract, are herein summarized in abstract form. Application of the emission and scattering theories to the modeling of sea brightness temperatures is discussed. The equations for the sea brightness temperature are numerically evaluated for microwave frequencies and the results compared with those of earlier models of Stogryn and of Wagner and Lynch. The second-order contributions, which prove to be appreciable, are examined in detail as a function of surface roughness, observation direction, and polarization. The quantitative dependence of the sea brightness temperature on frequency, polarization, observation angle, wind speed, fetch direction, atmospheric state, surface contamination, and water temperature is illustrated. The wavelength dependence of the emissivity of small-scale surface structure is examined using nongeometrical optics methods. (Author)

Descriptors :   (*OCEAN WAVES, *ELECTROMAGNETIC WAVE REFLECTIONS), SURFACE ROUGHNESS, LIGHT TRANSMISSION, RADIOMETERS, POLARIZATION, WIND

Subject Categories : Physical and Dynamic Oceanography
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE