Data/hora: 16/06/2024 03:46:46

Provedor de dados: 	5	
País: 	France	
Título: 	Evidence of strong inertia-gravity wave activity during the POMME experiment	
Autores: 	Bouruet-aubertot, Pascale; Mercier, Herle; Gaillard, Fabienne; Lherminier, Pascale.	
Data: 	2005-06	
Ano: 	2005	
Palavras-chave: 	Turbulent mixing; Tnertia gravity waves.	
Resumo: 	The purpose of this paper is to characterize inertia-gravity waves (IGW) activity and to investigate the variability of these waves in relationship to atmospheric forcing and larger-scale motions. To this aim, we analyzed Eulerian measurements of horizontal currents and temperature collected over 1 year during the Programme Océan Multidisciplinaire Méso Echelle (POMME). We focused on the main frequency components of the IGW spectrum, namely the inertial frequency f and the semidiurnal frequency M2. Time evolution of the relative energy of these two components gave evidence of isolated events of high intensity. We performed a detailed analysis of these events and identified mechanisms of generation of these waves. Localized spots of intense, near-inertial IGW were observed in winter. During the mixed layer deepening, one event was correlated with plume-like structures resulting from peaks of intense surface cooling. This suggests a local generation process driven by strong downward vertical motions. Instead, other events of strong IGW could be related to submesoscale features, characteristic of a frontal region, in particular, wave trapping within anticyclonic eddies. In contrast, a downward energy propagation down to about 500 m below the mixed layer was isolated after a stormy period. Eventually, internal tidal beams, possibly generated at a nearby seamount, intermittently crossed the mooring, though less energetically than the previous events. Last, we estimated the eddy diffusivity from the velocity vertical shear. Large variations were obtained, from 10-6 m2/s up to 10-3 m2/s, consistent with the intense events previously isolated.	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	http://archimer.ifremer.fr/doc/2005/publication-359.pdf

DOI:10.1029/2004JC002747

http://archimer.ifremer.fr/doc/00000/359/	
Editor: 	American Geophysical Union	
Formato: 	application/pdf	
Fonte: 	Journal of Geophysical Union - Research C - Oceans (0148-0227) (American Geophysical Union), 2005-06 , Vol. 110 , N. C7	
Fonte: 	2005 American Geophysical Union

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