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Discussion papers
https://doi.org/10.5194/essd-2019-173
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/essd-2019-173
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: data description paper 27 Sep 2019

Submitted as: data description paper | 27 Sep 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Earth System Science Data (ESSD).

PROTEVS-MED field experiments: Very High-Resolution Hydrographic Surveys in the Western Mediterranean Sea

Pierre Garreau1, Franck Dumas2, Stéphanie Louazel2, Stéphanie Correard2, Solenn Fercocq2, Marc Le Menn2, Alain Serpette2, Valérie Garnier1, Alexandre Stegner3, Briac Le Vu3, Andrea Doglioli4, and Gerald Gregori4 Pierre Garreau et al.
  • 1IFREMER, Univ. Brest, CNRS UMR 6523, IRD, Laboratoire d'Océanographie Physique et Spatiale (LOPS), IUEM, 29280, Plouzané, France
  • 2SHOM, Service Hydrographique et Océanographique de la Marine, 13 rue de Chatellier, CS592803, 29228 Brest CEDEX 2, France
  • 3Laboratoire de Météorologie Dynamique (LMD), CNRS UMR 8539, Ecole Polytechnique, 91128 Palaiseau, France
  • 4Aix Marseille Univ., Université de Toulon, CNRS, IRD, MIO UM 110, 13288 Marseille, France

Abstract. From 2015 to 2018 four field experiments (7 legs) have been performed in the Western Mediterranean Basin during winter or early spring. The main objectives were the assessment of high-resolution modelling, the observation of mesoscale structure and associated ageostrophic dynamics. Thanks to the intensive use of a towed vehicle undulating in the upper oceanic layer between 0 and 400 meter depth (a SeaSoar), a large amount of very high resolution hydrographic transects (about 10.000 km) have been performed, observing mesoscale dynamics (slope current and its instabilities, anticyclonic eddies, sub-mesoscale coherent vortices, frontal dynamics convection events, strait outflows) and sub-mesoscale processes like stirring, mixed layer or symmetric instabilities. When available, the data were completed with velocities recorded by Vessel Mounted Acoustic Doppler Current Profiler (VMADCP) and by surface salinity and temperature recorded by ThermosalinoGraph (TSG). CTD casts have also been performed giving the background hydrography of the deeper layers when focusing on peculiar objects. In 2017, a free fall profiler (an MVP-200) has been deployed to manage even higher horizontal resolution. The aim of the survey was the dynamics and attention were paid to temperature, salinity and currents. Nevertheless, biological sensors (Chlorophyll a, Turbidity, Dissolved Oxygen etc.) have been opportunely carried out as they are able to provide complementary observations about the circulation. This data set is an unprecedented opportunity to investigate the very fine scale processes as the Mediterranean Sea is known for its intense and contrasted dynamics. It should be useful for modellers (who reduce the grid size below a few hundred meters) and expect to properly catch finer scale dynamics. Likewise, theoretical work could also be illustrated by in situ evidence embedded in this data set. The data are available through SEANOE repository (https://doi.org/10.17882/62352; Dumas et al., 2018).

Pierre Garreau et al.
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PROTEVS-MED field experiments: Very High-Resolution Hydrographic Surveys in the Western Mediterranean Sea F. Dumas, P. Garreau, S. Louazel, S. Correard, S. Fercoq, M. Le Menn, A. Serpette, V. Garnier, A. Stegner, B. Le Vu, A. Doglioli, and G. Gregori https://doi.org/10.17882/62352

Pierre Garreau et al.
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Short summary
The oceanic circulation is composed of the main currents, of large eddies and meanders and of fine motions at scale in the range of few hundred of metres, rarely observed in situ. Protevs-Med experiments was devoted to very high resolution observations of water properties (as temperature and salinity) and currents thanks to an undulating trawled vehicle revealing a patchy, stirred and energetic ocean in the first 400 m depth. This fine scale dynamics drive the plankton and the air-sea exchanges.
The oceanic circulation is composed of the main currents, of large eddies and meanders and of...
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