| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
Evidence of strong inertia-gravity wave activity during the POMME experiment
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| Autores: |
Bouruet-aubertot, Pascale
Mercier, Herle
Gaillard, Fabienne
Lherminier, Pascale
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| Data: |
2005-06
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| Ano: |
2005
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| Palavras-chave: |
Turbulent mixing
Tnertia gravity waves
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| 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.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
http://archimer.ifremer.fr/doc/2005/publication-359.pdf
DOI:10.1029/2004JC002747
http://archimer.ifremer.fr/doc/00000/359/
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| Editor: |
American Geophysical Union
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| Formato: |
application/pdf
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| Fonte: |
Journal of Geophysical Union - Research C - Oceans (0148-0227) (American Geophysical Union), 2005-06 , Vol. 110 , N. C7
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| Direitos: |
2005 American Geophysical Union
info:eu-repo/semantics/openAccess
restricted use
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