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Seasonal variability of intermediate water masses in the Gulf of Cádiz: Implications of the Antarctic and subarctic seesaw

AuthorsRoque, David ; Parras-Berrocal, Ivan; Bruno, Miguel; Sánchez Leal, Ricardo; Javier Hernández-Molina, Francisco
Issue Date22-Oct-2019
PublisherEuropean Geosciences Union
CitationOcean Science 15(5): 1381-1397 (2019)
AbstractGlobal circulation of intermediate water masses has been extensively studied; however, its regional and local circulation along continental margins and variability and implications on sea floor morphologies are still not well known. In this study the intermediate water mass variability in the Gulf of Cádiz (GoC) and adjacent areas has been analysed and its implications discussed. Remarkable seasonal variations of the Antarctic Intermediate Water (AAIW) and the Subarctic Intermediate Water (SAIW) are determined. During autumn a greater presence of the AAIW seems to be related to a reduction in the presence of SAIW and Eastern North Atlantic Central Water (ENACW). This interaction also affects the Mediterranean Water (MW), which is pushed by the AAIW toward the upper continental slope. In the rest of the seasons, the SAIW is the predominant water mass reducing the presence of the AAIW. This seasonal variability for the predominance of these intermediate water masses is explained in terms of the concatenation of several wind-driven processes acting during the different seasons. Our finding is important for a better understanding of regional intermediate water mass variability with implications in the Atlantic Meridional Overturning Circulation (AMOC), but further research is needed in order to decode their changes during the geological past and their role, especially related to the AAIW, in controlling both the morphology and the sedimentation along the continental slopes.
Publisher version (URL)http://doi.org/10.5194/os-15-1381-2019
Identifiersdoi: 10.5194/os-15-1381-2019
e-issn: 1812-0792
issn: 1812-0784
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