Objective: influence of submesoscale coupled physics – biogeochemistry on cross-shelf (coast-offshore) exchanges Methodology : lagrangian strategy to follow a submesoscale eddy using lagrangian floats and an inert chemical tracer (SF6) Multi-disciplinary project + multi-«tools» (lagrangian floats, SF6, hull-mounted ADCP, moorings, satellite images, modelling, gliders, radars) for the 2010 September cruise Site of study: Gulf of Lion, north-western Mediterranean sea
Anticyclonic eddy A1 (here on August 1st, 2001) detected with WATERS

* List of LATEX participants and connected projects.

* To learn more on the project, here is the scientific proposition (PDF) submitted to LEFE for 2008-2011

* And here is one of the latest oral presentation (PDF) of the project including some of the latest results (numerical and experimental); from my presentation at the Workshop Twisted (PI M/ Levy) in Paris, September 2008.

Tools used:

* WATERS Wavelet Analysis for Time-tracking Eddies

Wavelet analysis performed on relative vorticity calculated from Symphonie POC modelled currents

Other uses of WATERS can be found on Dr Doglioli 's webpage.

* ARIANE is a computational tool (Fortran 90/95) that is dedicated to the offline calculation of 3D streamlines in the output velocity field of an Ocean General Circulation Model (OGCM) such as OPA-NEMO, ROMS, Symphonie and any ocean model whose equations are based on volume conservation.

see ARIANE 's webpage realized by Nicolas Grima at LPO for more information.

LATEX00 Results

Modelling
Click image to enlarge Anticyclonic eddy A1 on August 1st; A1 was detected for 32 days from July 17, to August 18, 2001.	The WATERS package was used in order to track the eddy or filament structures of the Gulf of Lion. It was applied to horizontal maps of relative vorticity, calculated from the velocity outputs of the SYMPHONIE model (data provided by C.Estournel and P.Marsaleix, POC, Toulouse).

The ARIANE toolkit has been coupled with de SYMPHONIE model and has provided both qualitative and quantitative numerical trajectories.

Click image to enlarge Ariane qualitative test: 170 lagrangian buoys were released in A1 on August 11, 2001 and followed for 51 days as shown in the three figures above (left to right) from day 6 to day 21, day 21 to day 36 and day 36 to day 51 (data provided by N.Grima, LPO, Brest).

@ Sea!
Tests of Lagrangian survey and determination of the background natural SF6 concentration.
Click image to enlarge LATEX00 cruise (june 2007): real trajectories and trajectories in a Lagrangian referential centered on the buoy (top: test for the egyptian spiral, bottom: test for the radiator).	Click image to enlarge Temperature and SF6 profiles at MOLA station (42.52°N, 3.54°E) on May 25, 2007.