Internal Tide Interactions in the Bay of Biscay: Observations and Modelling
Journal of Marine Systems 109-110 (2013) S26–S44 Contents lists available at ScienceDirect Journal of Marine Systems journal homepage: www.elsevier.com/locate/jmarsys Internal tide interactions in the Bay of Biscay: Observations and modelling A. Pichon a,⁎, Y. Morel b,1, R. Baraille b,1, L.S. Quaresma c a Service Hydrographique et Océanographique de la Marine, Centre Militaire d'Océanographie, 13 rue le Chatellier, BP 30316, 29603 Brest Cedex, France b Service Hydrographique et Océanographique de la Marine, Centre Militaire d'Océanographie, 14 avenue Edouard Belin, 31000 Toulouse, France c Instituto Hidrográfico, Divisão de Oceanografia, Rua das Trinas, n. 49 1249-093 Lisboa, Portugal article info abstract Article history: The paper addresses three-dimensional dynamics and interactions between internal waves in the Bay of Received 2 September 2010 Biscay, observed during an oceanographic survey conducted in summer 2006. These interactions are modelled Received in revised form 6 June 2011 and compared with observations. The effect of the internal tide (IT) beam structure in the deep ocean, on the Accepted 1 July 2011 interfacial IT along the seasonal thermocline, is analysed. Available online 12 July 2011 To determine the regions of strong three-dimensional interactions and explain the observed IT structures, numerical simulations are used. Model results and observations show evidence of IT following analytical ray Keywords: −1 Bay of Biscay paths, but also interactions between beams. IT currents higher than 0.20 m.s , are measured at 3000 m near Internal tides the bottom of the French continental slope, and are clearly modelled. In addition, in the mid-bay of Biscay, Internal solitary waves both the model and the data highlight a strong internal tidal current from 0 to a depth of 1500 m, generated by HYCOM model three-dimensional interactions.
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