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Onset of the Iberian upwelling along the Galician coast

AutorTorres, R. ; Barton, Eric D.
Palabras claveIberia
Spring transition
Fecha de publicación1-mar-2007
CitaciónContinental Shelf Research 27(13): 1759-1778 (2007)
ResumenThrough a set of observations including satellite, cruise and mooring data during May-July 1997 the transition between the downwelling and upwelling regimes off Galicia has been characterized. The poleward flow, typical of downwelling, was associated with a series of mesoscale eddies and interacted with coastal freshwater inputs. The poleward flow along the continental slope was separated into an offshore branch and a nearshore branch by a well-defined equatorward flow and both associated with a prominent salinity maximum. With the onset of upwelling-favorable winds, equatorward flow was established over the entire shelf. At the same time, a buoyant, warm surface layer spread out over the shelf from the Rías as water previously forced in by southerly winds was flushed out by the upwelling winds. The completed transition to summertime coastal upwelling took place after the cruise but was evident in satellite images. A conceptual model is used to demonstrate that the coastal orientation with respect to the upwelling winds enhances offshore flow outside the Rías and displaces the poleward flow offshore after several days of upwelling.
Descripción20 pages, 14 figures
Versión del editorhttp://dx.doi.org/10.1016/j.csr.2007.02.005
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