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| Danioux, Eric; Vanneste, J.; Klein, Patrice; Sasaki, H.. |
| The spontaneous generation of inertia-gravity waves (IGWs) by surface-intensified, nearly balanced motion is examined using a high-resolution simulation of the primitive equations in an idealized oceanic configuration. At large scale and mesoscale, the dynamics, which is driven by baroclinic instability near the surface, is balanced and qualitatively well described by the surface quasi-geostrophic model. This however predicts an increase of the Rossby number with decreasing spatial scales and, hence, a breakdown of balance at small scale; the generation of IGWs is a consequence of this breakdown. The wave field is analysed away from the surface, at depths where the associated vertical velocities are of the same order as those associated with the balanced... |
| Tipo: Text |
Palavras-chave: Internal waves; Quasi-geostrophic flows; Wave-turbulence interactions. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00083/19437/17389.pdf |
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| Urgeles, Roger; Cattaneo, Antonio; Puig, Pere; Liquete, Camino; De Mol, Ben; Amblas, David; Sultan, Nabil; Trincardi, Fabio. |
| Most Mediterranean prodeltas show undulated sediment features on the foresets of their Holocene wedges. These features have been described all along the Mediterranean for the last 30 years and interpreted as either soft sediment deformation and incipient landsliding, and more recently, as sediment transport structures. We perform a review and detailed analysis of these undulated sediment features using ultrahigh-resolution seismic and bathymetric data as well as geotechnical information and hydrodynamic time series and hydrographic transects. In this study we show that the characteristics of the sediment undulations (configuration of the reflections down section and between adjacent undulations and overall morphologic characteristics) are incompatible with... |
| Tipo: Text |
Palavras-chave: Undulated sediments; Prodeltas; Slope failure; Sediment waves; Hyperpycnal flows; Internal waves. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00043/15388/12841.pdf |
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| Van Haren, Hans; Millot, Claude. |
| In the ocean outside areas of dense-water formation, coherent vertical motions (w) are generally much weaker (similar to 10(-3)) than horizontal (u, v) ones. According to theoretical models based upon "the traditional approximation", i.e. where the horizontal component of the Coriolis force is neglected, describing inertio-gravity waves in the ocean interior, this holds especially for motions at the inertial frequency f: w(f) < O(10(-2)(u(f), v(f))). We present observations of significant w(f), with mean values of 10(-1)(u(f), v(f)) and occasional values of 1(u(f), v(f)), from the deep Western Mediterranean Sea characterized by very small buoyancy frequency N = 0 +/- 0.4f. Our observations also present evidence of vertical propagation of internal waves,... |
| Tipo: Text |
Palavras-chave: Vertical propagation; Gravity waves; Internal waves; Physical oceanography. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/publication-932.pdf |
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| Lahaye, Noe; Gula, Jonathan; Roullet, Guillaume. |
| Internal tides are a predominant source of high‐frequency variability and diapycnal mixing in the ocean. Understanding their dynamics and lifecycle is necessary to better understand their role in the ocean circulation. In this paper, we describe and quantify internal tide generation, propagation and dissipation in a sector of the North Mid‐Atlantic Ridge, using high‐resolution numerical simulations with realistic bathymetry and stratification. We show that the generation and dissipation of internal tides, as well as the distribution of internal tides amongst vertical modes, exhibit high spatial variability. We find that topographic scattering leads to a significant transfer of energy towards high vertical modes and thereby enhances internal tide... |
| Tipo: Text |
Palavras-chave: Energy dissipation & Mixing; Internal tides; Internal waves; Topographic scattering. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00658/77003/78259.pdf |
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| Wang, Haozhuang; Lo Iacono, Claudio; Wienberg, Claudia; Titschack, Jürgen; Hebbeln, Dierk. |
| Cold-water corals (CWCs) are widely distributed in the entire Alboran Sea (western Mediterranean Sea), but only along the Moroccan margin they have formed numerous coral mounds, which are constrained to the West and the East Melilla CWC mound provinces (WMCP and EMCP). While information already exists about the most recent development of the coral mounds in the EMCP, the temporal evolution of the mounds in the WMCP was unknown up to the present. In this study, we present for the first time CWC ages obtained from four sediment cores collected from different mounds of the WMCP, which allowed to decipher their development since the last deglaciation. Our results revealed two pronounced periods of coral mound formation. The average mound aggradation rates were... |
| Tipo: Text |
Palavras-chave: Cold-water coral mounds; Coral mound formation; Mound aggradation rate; Last deglaciation; Internal waves; Levantine Intermediate Water; Alboran Sea. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00483/59512/83481.pdf |
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| Chiriguaya, J.. |
| Las ondas internas son movimientos ondulatorios en fluidos de estratificación estable, en los cuales la máxima amplitud del movimiento vertical tiene lugar en la zona por debajo de la interfase, la cual se encuentra entre las superficies del fluido. La principal fuerza de recuperación es la gravedad. Se cree que las ondas internas se generan en el mar por variaciones de la presión atmosférica y por influencia de ondas superficiales de baja frecuencia en aguas de profundidad variable. Las ondas internas pueden presentarse entre capas de diferentes densidades en el océano, porque la diferencia de densidades conlleva a una presión gravitacional o hidrostática que será una fuerza restuaradora si el fluido se desplaza verticalmente. |
| Tipo: Journal Contribution |
Palavras-chave: Internal waves; Surface wave-internal wave interactions. |
| Ano: 1989 |
URL: http://hdl.handle.net/1834/2349 |
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| Chiriguaya, J.. |
| De la información obtenida del crucero CO-1-88, llevado a cabo desde el 8 al 30 de agosto de 1988, se efectuó un análisis de ondas internas en el mar ecuatoriano, para lo cual se realizaron mediciones desde la superficie hasta los 500 metros durante observaciones continuas de 24 horas denominadas estaciones fijas, con un intervalo de 3 a 4 horas aproximadamente entre cada uno de los lances. Basándose en los registros de temperatura del agua de mar y relacionando este parámetro con las fluctuaciones de salinidad, densidad y velocidad del sonido se establece, en el Pacífico Ecuatorial oriental, la existencia de ondas internas. Su presencia fue mayormente observada en la zona de la termoclina, relacionada ésta a movimientos ascendentes y descendentes. Además,... |
| Tipo: Journal Contribution |
Palavras-chave: Equatorial waves; Internal waves; Wave measurement. |
| Ano: 1989 |
URL: http://hdl.handle.net/1834/2146 |
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