Fisheries and oceanography off Galicia, NW Spain: Mesoscale spatial and temporal changes in physical processes and resultant patterns of biological productivity
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AuthorsTenore, K.R.; Alonso-Noval, M.; Álvarez-Ossorio-Costa, M.T. (María Teresa); Atkinson, L.P.; Cabanas-López, J.M. (José Manuel); Cal, R. (Rosa); Campos, H.J.; Castillejo, F.; Chesney, E.J.; González, N.; Hanson, R.B.; McClain, C.R.; Miranda, A. (Ana); Román, M.R.; Sánchez-Conde, F.J. (Francisco Javier); Santiago-Fierro, G. (Guillermo) de; Valdés-Santurio, L. (Luis); Varela-Rodríguez, M. (Manuel); Yoder, J.
The Galician shelf off NW Spain (43N° 9W°) exhibits mesoscale spatial and temporal changes in biological productivity associated with upwelling. Spatial heterogeneity results from local geomorphic and land-sea interactions superimposed on the large scale atmospheric processes that produce upwelling. Wind-induced upwelling events, commonly of short (i.e., week) duration, are more common in the summer than in the winter. A series of cruises, including some time series sampling, and satellite imagery analysis showed that surface upwelling was more common and persistent on the northern coast compared with the western coast off the coastal embayments, the Rias Bajas. Near shore off the rias, coastal runoff, which is greater in the rainy winter/spring versus the dry summer, affected upwelling. In early summer, upwelling less often reaches the surface because of increased water column stratification associated with lower surface salinities and thus upwelling is not detected by satellite imagery. ...