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Ramanantsoa J. D., Krug M., Penven Pierrick, Rouault M., Gula J. (2018). Coastal upwelling south of Madagascar : temporal and spatial variability. Journal of Marine Systems, 178, 29-37. ISSN 0924-7963

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Lien direct chez l'éditeur doi:10.1016/j.jmarsys.2017.10.005

Titre
Coastal upwelling south of Madagascar : temporal and spatial variability
Année de publication2018
Type de documentArticle référencé dans le Web of Science WOS:000418215000003
AuteursRamanantsoa J. D., Krug M., Penven Pierrick, Rouault M., Gula J.
SourceJournal of Marine Systems, 2018, 178, p. 29-37. ISSN 0924-7963
RésuméMadagascar's southern coastal marine zone is a region of high biological productivity which supports a wide range of marine ecosystems, including fisheries. This high biological productivity is attributed to coastal up-welling. This paper provides new insights on the structure, variability and drivers of the coastal upwelling south of Madagascar. Satellite remote sensing is used to characterize the spatial extent and strength of the coastal upwelling. A front detection algorithm is applied to thirteen years of Multi-scale Ultra-high Resolution (MUR) Sea Surface Temperatures (SST) and an upwelling index is calculated. The influence of winds and ocean currents as drivers of the upwelling is investigated using satellite, in-situ observations, and a numerical model. Results reveal the presence of two well-defined upwelling cells. The first cell (Core 1) is located in the southeastern corner of Madagascar, and the second cell (Core 2) is west of the southern tip of Madagascar. These two cores are characterized by different seasonal variability, different intensities, different upwelled water mass origins, and distinct forcing mechanisms. Core 1 is associated with a dynamical upwelling forced by the detachment of the East Madagascar Current (EMC), which is reinforced by upwelling favourable winds. Core 2 appears to be primarily forced by upwelling favourable winds, but is also influenced by a poleward eastern boundary flow coming from the Mozambique Channel. The intrusion of Mozambique Channel warm waters could result in an asynchronicity in seasonality between upwelling surface signature and upwelling favourables winds.
Plan de classementLimnologie physique / Océanographie physique [032]
Descr. géo.MADAGASCAR ; OCEAN INDIEN
LocalisationFonds IRD [F B010071900]
Identifiant IRDfdi:010071900
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010071900

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