Revisiting the Short-Wave Spectrum of the Sea Surface in the Light of the Weighted Curvature Approximation

Type Article
Date 2014-01
Language English
Author(s) Bringer Alexandra1, 2, Chapron Bertrand3, Mouche AlexisORCID4, Guerin Charles-Antoine1, 2
Affiliation(s) 1 : Univ Toulon & Var, CNRS INSU, IRD, MIO,UM 110, F-83957 La Garde, France.
2 : Aix Marseille Univ, CNRS INSU, IRD, MIO,UM 110, F-13288 Marseille, France.
3 : IFREMER, Lab Oceanog Spatiale, F-29280 Plouzane, France.
4 : CLS, F-29280 Plouzane, France.
Source Ieee Transactions On Geoscience And Remote Sensing (0196-2892) (Ieee-inst Electrical Electronics Engineers Inc), 2014-01 , Vol. 52 , N. 1 , P. 679-689
DOI 10.1109/TGRS.2013.2243459
WOS© Times Cited 15
Keyword(s) Microwave ocean remote sensing, omnidirectional spectrum
Abstract Existing models for the short-wave spectrum of the sea surface are not consistent with microwave satellite data when multi-bands and multi-incidence data sets are considered. We devise a simple parametric model for the short-wave omnidirectional spectrum of the sea surface on the basis of a three-band (C, Ku, and Ka) and multi-incidence (low, moderate, and large) data set and an improved analytical scattering model, namely the non-Gaussian Weighted Curvature Approximation. This spectrum is also constrained by several optical measurements which provide a priori conditions on the total and filtered mean-square slopes. It is compared with classical models such as Elfouhaily and Kudryavtsev unified curvature spectra. Significant differences are observed at wave numbers corresponding to the range of decimeter scales. The new spectrum is by construction fully consistent with the omnidirectional normalized radar cross section of the multi-band data set.
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