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, 4 Laurent Mortier 1 Hervé Le Goff 5, 4 Denis Dausse 5, 4 Matthieu Labaste 5, 4 Johannes Karstensen 6 Daniel Hayes 7 Antonio Olita 8 Alberto Ribotti 8 Katrin Schroeder 9 Jacopo Chiggiato 9 Reiner Onken 10 Emma Heslop 11 Baptiste Mourre 11 Fabrizio d'Ortenzio 12 Pierre Mayot 12 Héloise Lavigne 12 Orens de Fommervault 12 Laurent Coppola 12 Louis Prieur 12 Vincent Taillandier 12 Xavier Durrieu de Madron 13 François Bourrin 13 Gael Many 13 Pierre Damien 14 Claude Estournel 14 Patrick Marsaleix 14 Isabelle Taupier-Letage 15 Patrick Raimbault 15 Robin Waldman 16 Marie-Noëlle Bouin 17 Hervé Giordani 17 Guy Caniaux 16 Samuel Somot 16 Véronique Ducrocq 16 Pascal Conan 18
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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Submitted on : Wednesday, April 11, 2018 - 4:32:33 PM
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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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