| Registro completo |
| Provedor de dados: |
ArchiMer
|
| País: |
France
|
| Título: |
Energetics of internal tides around the Kerguelen Plateau from modeling and altimetry
|
| Autores: |
Maraldi, Claire
Lyard, Florent
Testut, Laurent
Coleman, Richard
|
| Data: |
2011-06
|
| Ano: |
2011
|
| Palavras-chave: |
Internal tides
Kerguelen Plateau
Altimetry
Barotropic tides
|
| Resumo: |
A barotropic tidal model, with a parameterization term to account for the internal wave drag energy dissipation, is used to examine areas of possible M(2) internal tide generation in the Kerguelen Plateau region. Barotropic energy flux and a distribution of wave drag dissipation are computed. The results suggest important conversion of barotropic energy into baroclinic tide generation over the northern Kerguelen Plateau shelf break, consistent with a theoretical criterion based on ocean stratification, tidal forcing frequency, and bathymetric gradients. The sea surface height signatures of time-coherent internal tides are studied using TOPEX/Poseidon and Jason-1 altimeter data, whose ascending tracks cross nearly perpendicular to the eastern and western Kerguelen Plateau shelf break. Oscillations of a few centimeters associated with phase-locked internal tides propagate away from the plateau over distances of several hundred kilometers with a similar to 110 km wavelength. When reaching the frontal area of the Antarctic Circumpolar Current, the internal tide cannot be identified because of the aliasing of mesoscale variability into the same alias band as M(2). Finally, using altimeter data, we estimate the M(2) barotropic tidal power converted through the internal tide generation process. We find consistent values with the barotropic model parameterization estimation, which is also in good agreement with global internal tide model estimates. Combined with modeling, this study has shown that altimetry can be used to estimate internal tide dissipation.
|
| Tipo: |
Text
|
| Idioma: |
Inglês
|
| Identificador: |
https://archimer.ifremer.fr/doc/00144/25564/23709.pdf
DOI:10.1029/2010JC006515
https://archimer.ifremer.fr/doc/00144/25564/
|
| Editor: |
Amer Geophysical Union
|
| Formato: |
application/pdf
|
| Fonte: |
Journal Of Geophysical Research-oceans (0148-0227) (Amer Geophysical Union), 2011-06 , Vol. 116 , N. C06004 , P. 1-10
|
| Direitos: |
2011 by the American Geophysical Union.
info:eu-repo/semantics/openAccess
restricted use
|
|
