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| Pinot, Jm; Tintore, J; Lopezjurado, Jl; Depuelles, Mlf; Jansa, J. |
| The three-dimensional circulation of an eddy/front system is quantified using hydrographic data collected in the Channel of Ibiza, Western Mediterranean, during November 1990. The ageostrophic motion is derived from the quasi-geostrophic omega equation. Maximum upward velocities (approximate to 4 m/day) are diagnosed on the cold side of the front in the vicinity of a cyclonic eddy and coincident with a sub-surface convergence (below 50 m). This upward motion can be explained in terms of advection over isopycnals that uplift in the along-front direction. We also show the relevance of the three-dimensional circulation for the enhanced fertilization observed in the surface layer. Our results establish the importance of the ageostrophic dynamics induced by... |
| Tipo: Text |
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| Ano: 1995 |
URL: http://archimer.ifremer.fr/doc/00097/20787/18412.pdf |
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| Lopezjurado, Jl; Lafuente, Jmg; Lucaya, Nc. |
| The hydrographic conditions of the Ibiza Channel were studied in successive surveys during November 1990, March 1991 and twice in July 1992. From a hydrographic viewpoint we must emphasize the importance of the intrusion of Modified Atlantic Water (MAW) with its associated front as a result of mesoscale processes, and the presence of the seasonal Winter Intermediate Water (WIW) which fills the entire width of the channel in the form of a layer between 300 or 400 m thick. This water mass affects the dynamics of the Ibiza Channel by a reduction in the exchange, hiding the seasonal characteristics of the Levantine Intermediate Water (LIW), which we consider to be one of the causes of the circulatory change in the channel. The combined action of the different... |
| Tipo: Text |
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| Ano: 1995 |
URL: http://archimer.ifremer.fr/doc/00097/20868/18486.pdf |
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