Contract duration: 18 months
Starting date: April 2013 (flexible)
Laboratory: ENSTA ParisTech, UME, Campus Scientific de Palaiseau (FGO team, with Karine Béranger and Thomas Arsouze, in close collaboration with CNRM)
Scientific background: The north-western Mediterranean, or more commonly referred to as the Gulf of Lion, is a highly favorable area for observing a large diversity of dynamical oceanic processes (winter convection, shallow circulation above the plateau, steep continental margin slope with canyons, coastal current, upwellings, etc ...). In particular, the current along the northern margin (Millot 1999), which meanders and forms mesoscale eddies, is a key process in cross-shore exchanges (Langlais, 2007, Ourmières et al. 2011) and mixing in general. Winter convection that takes place in the Gulf of Lion fuels the Mediterranean thermohaline circulation (Schott et al. 1996), with strong interannual events amplitudes (Schroeder et al. 2008). Mesoscale and sub-mesoscale structures play an important role in the transport of water masses formed, especially from the northern to the southern part of the basin (Beuvier et al., 2012; Testor and Gascard 2003). To better understand these processes, we use numerical models with increasingly high resolution to resolve sub-mesoscale (filaments, eddies, <10km) to represent the turbulent mixing zone.
Job Description: The project proposed here aims to set up a high-resolution (1/36 °) oceanic zoom in the Gulf of Lion interacting (two-ways) with a model of greater influence and lower resolution (1/12 °). The tool is based on the European Code NEMO, in the Mediterranean configuration, and the interactions between the nested zone and the larger domain are managed by the AGRIF tool. A relatively high number of observations in this region (MOOSE network, MEDOC mooring, etc..., and the ones that will be obtained during oceanographic cruises planned in the framework of the HYMEX program) and the reanalysis of the circulation of the Mediterranean performed at 1/12 ° (ReaMED project) that will soon be available will be used to validate the simulations. This first set-up at 1/12 ° and 1/36 ° could be used to implement zooms at higher resolution of 1/72 ° or more (500m, 1km). Cross-shore exchanges in the Gulf of Lion, as well as water mass transport between the Gulf of Lion, the Algerian basin, the Strait of Gibraltar and the Tyrrhenian Sea will be analyzed. The quantification of imported and exported water from one region to another as part of small-scale structures (sub-mesoscale) will be of particular attention. The critical point of this study is the estimation of the turbulent transport of water masses in coherent structures (little mixing with surrounding waters).
Qualifications: Candidates must hold a PhD in physical oceanography or atmospheric dynamics with experience in numerical modeling. The emphasis of the project is on the establishment of a numerical modeling configuration, as well as comparison with data. Experience with programming tools and scientific
visualization (unix environment, fortran, matlab or idl) would be highly advantegeous. Knowledge of NEMO and / or AGRIF is a plus.
Compensation: net salary will be approximatively 2000 euros per month depending on experience.
Contact: Interested candidates should send a CV, an application letter (which details their interest in the project, and what their aptitude is compared to the project objectives) and the contact details of two referees to Thomas Arsouze email@example.com.