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Multiscale Observations of Deep Convection in the Northwestern Mediterranean Sea during Winter 2012-2013 Using Multiple Platforms

Pierre Testor 1 Anthony Bosse 2 Loïc Houpert 3 Félix Margirier 1 Laurent Mortier 1 Hervé Le Goff 4 Denis Dausse 4 Matthieu Labaste 4 Johannes Karstensen 5 Daniel Hayes 6 Antonio Olita 7 Alberto Ribotti 7 Katrin Schroeder 8 Jacopo Chiggiato 8 Reiner Onken 9 Emma Heslop 10 Baptiste Mourre 10 Fabrizio d'Ortenzio 11 Pierre Mayot 11 Héloise Lavigne 11 Orens Pasqueron de Fommervault 11 Laurent Coppola 11 Louis Prieur 11 Vincent Taillandier 11 Xavier Durrieu de Madron 12 François Bourrin 12 Gael Many 12 Pierre Damien 13 Claude Estournel 13 Patrick Marsaleix 13 Isabelle Taupier-Letage 14 Patrick Raimbault 14 Robin Waldman 15 Marie-Noëlle Bouin 15 Hervé Giordani 15 Guy Caniaux 15 Samuel Somot 15 Véronique Ducrocq 15 Pascal Conan 16
Abstract : During winter 2012–2013, open‐ocean deep convection which is a major driver for the thermohaline circulation and ventilation of the ocean, occurred in the Gulf of Lions (Northwestern Mediterranean Sea) and has been thoroughly documented thanks in particular to the deployment of several gliders, Argo profiling floats, several dedicated ship cruises, and a mooring array during a period of about a year. Thanks to these intense observational efforts, we show that deep convection reached the bottom in winter early in February 2013 in a area of maximum 28 ± 3 109 m2. We present new quantitative results with estimates of heat and salt content at the subbasin scale at different time scales (on the seasonal scale to a 10 days basis) through optimal interpolation techniques, and robust estimates of the deep water formation rate of 2.0 ± 0.2 Sv. We provide an overview of the spatiotemporal coverage that has been reached throughout the seasons this year and we highlight some results based on data analysis and numerical modeling that are presented in this special issue. They concern key circulation features for the deep convection and the subsequent bloom such as Submesoscale Coherent Vortices (SCVs), the plumes, and symmetric instability at the edge of the deep convection area.
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Pierre Testor, Anthony Bosse, Loïc Houpert, Félix Margirier, Laurent Mortier, et al.. Multiscale Observations of Deep Convection in the Northwestern Mediterranean Sea during Winter 2012-2013 Using Multiple Platforms. Journal of Geophysical Research. Oceans, Wiley-Blackwell, 2018, 123 (3), pp.1745-1776. ⟨10.1002/2016JC012671⟩. ⟨hal-01764125⟩

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