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handle: 10261/26996
[FR] Au printemps de 1974, des structures á l'échelle moyenne des masses d'eau se sont rencontrées dans le secteur au large du Cap Corveiro. II existait une distribution des caractéristiques hydrologiques typique de la transition entre les masses d'eau centrales nord- et sud-atlantique. Les structures avaient des amplitudes plus grandes dans la couche des 300 premiers métres, oú se rencontrait le contraste le plus fort, entre les deux masses d'eau. L'intensité des structures variait avec la distance vers le large, c'est-á-dire avec la situation hydrologique et des courants. Les courants géostrophiques étaient en accord avec la distribution des masses d'eau et avec la variation spatiale de l'intensité des structures. II y avait moins d'intensité dans les régions aux caractéristiques T-S des masses d'eau pures et plus d'intensité oú les caractéristiques étaient intermédiaires. Á toutes les stations la corrélation calculée entre les perturbations de température et de salinité a été élevée pour toutes les longueurs d'onde. La corrélation entre les structures de température ou salinité aux différentes positions séparées par 10 km a été négligeable ou pauvre pour toutes les longueurs d'onde.
[EN] In the spring of 1974, medium-scale interleaved watermass structures were present offshore Cape Corveiro. A range of water-mass properties, typical of the transition from NACW to SACW in the area, was present. The structure had greatest amplitudes in the upper 300 m, where the contrast in T-S characteristics was greatest. The intensity of the structure varied with distance offshore and was related to the background hydrographic and current situation. Although the geostrophic calculations are open to some doubt, the computed currents were consistent with the observed water-mass distributions and the spatial variations in intensity of interleaving structures. Intensity was least where pure NACW or SACW was found and greatest where T-S characteristics were intermediary. At all positions, the temperature and salinity structures were highly correlated at all wavelengths. In the horizontal, structures were uncorrelated at most wavelengths and only weakly correlated at even the longest wavelengths over distances of 10 km.
The field program was funded by U. S. National Science Foundation Grant GX-33502. The analysis was funded by the Mexican Federal Government through CICESE (Centro de Investigación Científica y de Educación Superior de Ensenada, B.C.).
8 páginas, 8 figuras, 1 tabla.-- Based on a poster presentation at the Symposium on the Canary Current: Upwelling and Living Resources, Las Palmas, 1978.
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