On radar imaging of current features: 1. Model and comparison with observations - art. no. C07016

Type Publication
Date 2005-07
Language English
Copyright 2005 by the American Geophysical Union
Author(s) Kudryavtsev V1, Akimov D2, Johannessen Johnny3, 4, Chapron Bertrand5
Affiliation(s) 1 : Inst Marine Hydrophys, Sevastopol, Ukraine.
2 : Nansen Environm & Remote Sensing Ctr, N-5006 Bergen, Norway.
3 : Nansen Environm & Remote Sensing Ctr, St Petersburg 19701, Russia.
4 : Univ Bergen, Inst Geophys, Bergen, Norway.
5 : Inst Francais Rech Exploitat Mer, F-29280 Plouzane, France.
Source Journal of Geophysical Union - Research C - Oceans (0148-0227) (American Geophysical Union), 2005-07 , Vol. 110 , N. C7 , P. NIL_33-NIL_59
DOI 10.1029/2004JC002505
WOS© Times Cited 78
Keyword(s) Breaking waves, Scattering, Radar imaging model, Ocean surface current
Abstract [1] A new radar imaging model of ocean current features is proposed. The simulated normalized radar cross section ( NRCS) takes into account scattering from "regular'' surfaces ( by means of resonant Bragg scattering and specular reflections) and scattering from breaking waves. The description of background wind waves and their transformation in nonuniform medium is based on solution of the wave action conservation equation. Wave breaking plays a key role in the radar imaging model. Breaking waves scatter radio waves ( thus directly contributing to the NRCS), provide energy dissipation in wind waves ( thus defining the wave spectrum of intermediate scale waves), and generate short surface waves ( thus affecting Bragg scattering). Surface current, surfactants accumulated in the convergence zone, and varying wind field are considered as the main sources for the NRCS manifestations of current features. The latter source can result from transformation of atmospheric boundary layer over the sea surface temperature front. It is shown that modulation of wave breaking significantly influences both radar returns and short wind waves. In the range of short gravity waves related to Ku-X-, and C-bands, the modulation of Bragg waves through wave breaking is the governing mechanism. The model is tested against well-controlled experiments including JOWIP, SARSEX, and CoastWatch-95. A reasonably good agreement between model and observations is obtained.
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Kudryavtsev V, Akimov D, Johannessen Johnny, Chapron Bertrand (2005). On radar imaging of current features: 1. Model and comparison with observations - art. no. C07016. Journal of Geophysical Union - Research C - Oceans, 110(C7), NIL_33-NIL_59. Publisher's official version : http://doi.org/10.1029/2004JC002505 , Open Access version : http://archimer.ifremer.fr/doc/00000/762/