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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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| Thierry, Virginie; Mercier, Herle; Treguier, Anne-marie. |
| Low-frequency current fluctuations in the deep central equatorial Atlantic are analyzed using current meter measurements recorded from November 1992 to November 1994. Current meters were located at about 14 degrees W of longitude and 1 degrees of latitude on both sides of the equator between 1,700 m depth and the ocean bottom. At all sampling depths, the velocity fluctuations are dominantly zonal and symmetrical with respect to the equator. At 1,700 and 2,000 m, the flow is dominated by annual period fluctuations, at 3,000 m, the velocity field amplitude presents a minimum, and at 3,750 and 3,950 m, the flow is modulated by annual and semiannual period variability. The annual signal exhibits an apparent upward phase propagation. When considering the phase... |
| Tipo: Text |
Palavras-chave: Vertical propagation; Equatorial waves; Numerical model; Current meter data; Equatorial Atlantic Ocean. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-2257.pdf |
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