Low-salinity plumes in the oceanic region of the Basque Country |
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| Authors: | L Ferrer A Fontán J Mader G Chust M González V Valencia Ad Uriarte MB Collins |
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| Institution: | 1. GEOTOP, Université du Québec à Montréal, CP 8888, Montréal, Québec H3C 3P8, Canada;2. Université de Bordeaux, EPOC, UMR 5805, F-33400 Talence, France;1. UMR CNRS 6112 LPGN-BIAF, Laboratoire des Bio-Indicateurs Actuels et Fossiles, LUNAM Université, Université d''Angers, 2 Boulevard Lavoisier, 49045 Angers Cedex, France;2. Laboratoire d''Etude des Bio-Indicateurs Marins (LEBIM), Ker Chalon, Port Joinville, 85350 Ile d''Yeu, France;3. UMR CNRS-CEA 8212 LSCE, Laboratoire des Sciences du Climat et de l''Environnement, LSCE-Vallée Bât. 12, avenue de la Terrasse, 91198 Gif-Sur-Yvette Cedex, France;4. UMR CNRS 5805 EPOC, Environnements et Paléo-environnements OCéaniques, Site de Talence, Université de Bordeaux 1, avenue des Facultés, 33405 Talence Cedex, France;1. Faculty of Geosciences, University of Bremen, Bremen, Germany;2. MARUM - Center for Marine Environmental Sciences, University of Bremen, Bremen, Germany;3. Senckenberg am Meer, Marine Research Department, Wilhelmshaven, Germany;4. Department of Coastal and Marine Systems Sciences, Coastal Carolina University, Conway, SC, USA |
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| Abstract: | Low-salinity waters, within the upper layers of the water column, have been observed in the oceanic region of the southeastern limit of the Bay of Biscay (in March, 2007). This contribution assesses the potential role of large surface freshwater discharges from the Adour (France), Nervión, Oria, Deba, Urola, Urumea and Bidasoa (Basque Country) rivers, to explain the presence of these low-salinity waters. Such discharges, within the offshore waters, reached to at least 50 m in depth; likewise, extending over 15–20 km, in the horizontal. This pattern is confirmed by field data collected by offshore buoys, model results, and the analysis of satellite images. The presence of the low-salinity waters is corroborated by numerical simulations, performed by the ROMS (Regional Ocean Modeling System) hydrodynamic model, with the incorporation of river discharges. In order to simulate the freshwater movements and to identify their origin, particles were released at the river mouths and dispersed (by a Lagrangian particle-tracking model, LPTM), supplied by 3-hourly current fields derived from the ROMS model. The plumes of the Nervión, Oria, Urola and Urumea rivers appear to be the main factors contributing to the low-salinity field, at the offshore locations of the buoys. This pattern is related mainly to the prevailing oceano-meteorological conditions, over the period of analysis. |
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