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The FETCH experiment: An overview - art. no. 8053 ArchiMer
Hauser, Danièle; Branger, H; Bouffies Cloche, S; Despiau, S; Drennan, W; Dupuis, H; Durand, P; De Madron, X; Estournel, C; Eymard, L; Flamant, C; Graber, H; Guerin, C; Kahma, K; Lachaud, G; Lefevre, J; Pelon, J; Petterson, H; Piguet, B; Queffeulou, Pierre; Tailliez, D; Tournadre, Jean; Weill, A.
The "flux, etat de la mer, et tele'de'tection en conditions de fetch variable'' (FETCH) was aimed at studying the physical processes associated with air-sea exchanges and mesoscale oceanic circulation in a coastal region dominated by frequent strong offshore winds. The experiment took place in March-April 1998 in the northwestern Mediterranean Sea (Gulf of Lion). Observations were collected with the R/V L'Atalante, with an air-sea interaction spar (ASIS) buoy, with waverider buoys, and with research aircraft equipped for in situ and remote sensing measurements. The present paper is an introduction to the following special section, which groups 12 papers (including this one) presenting results on turbulent flux measurements at the ocean surface, on the...
Tipo: Text Palavras-chave: Gulf of Lion; Coastal oceanography; Marine atmospheric boundary layer; Remote sensing; Surface ocean waves; Air/sea interactions.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/publication-747.pdf
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A time-frequency application with the Stokes-Woodward technique ArchiMer
Elfouhaily, Tanos; Guignard, S; Branger, H; Thompson, D; Chapron, Bertrand; Vandemark, D.
In a recent paper, we have generalized Woodward's theorem and applied it to the case of random signals jointly modulated in amplitude and frequency. This generalization yields a new spectral technique to estimate the amount of energy due to mode coupling without calling for higher order statistics. Two power spectra are detected; the first is related to the independent modes, and the second contains extra energy caused by mode coupling. This detection is now extended from frequency to time-frequency domain. A comparison between a wavelet transform and our time-frequency technique shows good agreement along with new insight into the time occurrence of the nonlinearities or mode coupling. An application to water surface waves is given in this letter as an...
Tipo: Text Palavras-chave: Wind waves; Wave wave interaction; Vertical asymmetry; Time frequency distributions; Nonlinear hydrodynamic processes; Mode coupling; Instantaneous frequency; Instantaneous amplitude; Horizontal asymmetry; AM FM; Amplitude modulation frequency modulation.
Ano: 2003 URL: https://archimer.ifremer.fr/doc/2003/publication-744.pdf
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