Hydrography of the Artabro Gulf in summer: western coastal limit of Cantabrian seawater and wind-induced upwelling at prior cape |
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| Institution: | 1. Research Group for Marine Geochemistry (ICBM-MPI Bridging Group), Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, Oldenburg, Germany;2. Microbiogeochemistry, Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, Oldenburg, Germany;3. Hydrogeology and Landscape Hydrology, Department of Biology and Environmental Sciences, University of Oldenburg, Oldenburg, Germany;4. Biology of Geological Processes, Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, Oldenburg, Germany;1. University Giessen, Animal Ecology & Systematic Zoology, Heinrich Buff Ring 29, D-35392 Giessen, Germany;2. Max Planck Institute for Biogeochemistry, POB 100164, 07701 Jena, Germany;3. Research Group for Marine Geochemistry (ICBM-MPI Bridging Group), Univ. of Oldenburg, Institute for Chemistry and Biology of the Marine Environment (ICBM), Carl-von-Ossietzky-Str. 9-11, 26111 Oldenburg, Germany;4. University Giessen, Landscape Ecology & Resources Management, Res Ctr BioSyst Land Use & Nutr IFZ, Heinrich-Buff-Ring 26-32, D-35392 Giessen, Germany;5. Limnological River Station of the Max Planck Institute for Limnology, Schlitz, Germany;1. Atmosphere and Ocean Research Institute, The University of Tokyo, Japan;2. Department of Oceanography, Pukyong National University, South Korea;3. Graduate School of Fisheries and Environmental Sciences, Nagasaki University, Japan |
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| Abstract: | The Artabro Gulf (1500 km2 north-west of the Iberian Peninsula) has been studied based on data obtained in August 1993, under typical summer meteorological conditions (COPLA 893 cruise). This is the first study on the summer hydrography of the Artabro Gulf. During this season, the hydrography of this area is quite complex and must be understood in terms of three factors: 1) upwelling, 2) two different eastern North Atlantic Central Water (ENACW) water masses and 3) rias water exchange. A local wind-induced upwelling of ENACWp (subpolar) occurs off Prior Cape. The plume is located off the gulf coastline, but inside the continental shelf. The frontal zone, rich in nutrients and chlorophyll, is parallel to the gulf line, starting in the Prior region and ending at the convergence of ENACWp and ENACWt (subtropical), giving it an arched shape. The Artabro Gulf is the place off the Galicia coast where ENACWt and ENACWp are observed and the gulf is the western limit of coastal Cantabrian Sea influence. The upwelling is strongly influenced by the topographic presence of the gulf which generates an ‘upwelling shadow’ where the rias water exchange is confined near the coast and the ENACWp does not penetrate into the rias. The opposite occurs at the southernmost Rias Bajas, where ENACWt upwells inside the rias. |
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