The emissivity of foam-covered water surface at L-band: theoretical modeling and experimental results from the FROG 2003 field experiment

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Document typeArticle
Defense date2005-05
PublisherIEEE Press. Institute of Electrical and Electronics Engineers
Rights accessOpen Access
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Abstract
Sea surface salinity can be measured by microwave
radiometry at L-band (1400–1427 MHz). This frequency is a
compromise between sensitivity to the salinity, small atmospheric
perturbation, and reasonable pixel resolution. The description
of the ocean emission depends on two main factors: 1) the sea
water permittivity, which is a function of salinity, temperature,
and frequency, and 2) the sea surface state, which depends on the
wind-induced wave spectrum, swell, and rain-induced roughness
spectrum, and by the foam coverage and its emissivity. This study
presents a simplified two-layer emission model for foam-covered
water and the results of a controlled experiment to measure the
foam emissivity as a function of salinity, foam thickness, incidence
angle, and polarization. Experimental results are presented, and
then compared to the two-layer foam emission model with the
measured foam parameters used as input model parameters. At
37 psu salt water the foam-induced emissivity increase is 0.007
per millimeter of foam thickness (extrapolated to nadir), increasing
with increasing incidence angles at vertical polarization,
and decreasing with
CitationCamps, A. [et al.]. The emissivity of foam-covered water surface at L-band: theoretical modeling and experimental results from the FROG 2003 field experiment. "IEEE transactions on geoscience and remote sensing", Maig 2005, vol. 43, núm. 5, p. 925-937.
ISSN0196-2892
Publisher versionhttp://hdl.handle.net/2117/1045
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