A Combined Foam-Spray Model for Ocean Microwave Radiometry
Abstract
Passive microwave emissions from oceanic dispersed media are considered. The spray is modeled by the aggregates of spherical water droplets, and the foam is represented by a macroscopic system of hollow spherical water shells. Dielectric properties of foam and scattering-absorption characteristics of spray are incorporated through the boundary reflection coefficient and the radiative transfer equation. The model provides spectral band-to-band dependencies of the emission in a wide range of wavelengths from 0.3 to 8 cm for different foam-spray parameters. In particular, spray located over water or foam surfaces may cause positive as well as negative brightness temperature contrasts (the so-called cooling effect ). At certain conditions, such sign-variable signatures can be registered by a multi-channel microwave radiometer. The modeling is intended for advanced remote sensing studies including monitoring of high wind situations, determination of air-sea fluxes and evaporation, detection of two-phase patterns in the oceans, and also for retrieval purposes.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 25, 2005
- Accession Number
- ADA454165
Entities
People
- Victor Raizer