MENOR/MARS3D : un outil de Recherche et de Prévision opérationnelle en Méditerranée sur Caparmor»

Transcription

1 MENOR/MARS3D : un outil de Recherche et de Prévision opérationnelle en Méditerranée sur Caparmor» Pierre Garreau Valérie Garnier, Tina Odoka, Gael Andre, Mathieu Jouan... Ifremer Centre de Brest Pierre.garreau@ifremer.fr 1

2 Challenges Modelling the North Current dynamics (density driven current) Modelling the dense water formation on the shelf off the Gulf of Lion Simulate the behaviour of the Rhône plume Modelling upwellings (generation and relaxation) Modelling the seasonal patterns of the circulation Build a robust configuration (daily run) 2

3 Building A chain of nested model Regional model l (resolution about 1km), using ogcm results (MERCATOR of MFS) to force at the open boudaries Understand the regional circulation. Recruitement of fishes Transportation of larvae..; Coastal Model (resolution 400m). Small scales process Local model (resolution < 150m) Impact of seawage release or fish farming 3

4 CONSTRUCTION DE LA CONFIGURATION The domain extension? 4

5 Choose a configuration The size of the cell? Radius of deformation in the North current is about 4-5 km The Rhone plume (buoyancy forcing ) need high resolution. Simulation upwelling filaments is expected -> DX, DY 1.2 km The vertical resolution? Shelf of the Gulf of Lion (100 m deep). Taken into account the shelf break. Sufficiently fine vertical resolution near the surace to describe the seasonnal thermocline. 30 «sigma coordinate» levels refined near the surface and near the bottom The Time step? DT < DX/U DT<1200m/(2m/s) 600s -> s 5

6 Open Boundaries conditions Initial conditions Mars3D code Resolution 1. km 30 Sigma level Time step Dt=300s Open Boundary conditions - temperature and salinity are prescribed. -Sea surface heigth η( x, t) = αηprescribed( x, t) + (1 α ) ηprognostic( x+ x, t t) -Embeded in Mercator or MFS OGCM (resolution about 5-7 km) - velocities 6

7 Improving the meteorological forcing using MM5 -MM5 code - ACRI-ST - spatial resolution 3 km. - The modelled sea surface temperature is taken into account trough bulk formulae -Next step will be a full interaction between the sea and the atmosphere 7

8 Modelling the North Current dynamics 8 15 mai 2008

9 Modelling the North Current dynamics 9 15 mai 2008

10 Modelling the seasonal variation of the North Current 1.2 Sv Less than 0.1Sv Can reverse Flux through the Corsica Channel 10

11 Modelling the North Current dynamics At the end of Winter the ECC is strong. 11

12 Modelling the North Current dynamics Late Spring : WCC and ECC merges in Ligurian Sea. 12

13 Modelling the North Current dynamics In Autumn : ECC vanishes 13

14 Lagrangian floats mai 2008

15 Lagrangian floats mai 2008

16 UTILISATION OPERATIONNELLE dayly products : -1 day hindcast + 3 days forecast of meteorological forcing (high résolution MM5 model using NCEP for initial and boundary Condition) - 1day hindcast + 3 day forecast of the North-Western of the Mediterranéan Sea

17 Projet SARDONE Transport des oeufs et larves d Anchois 17

18 Projet SARDONE Transport des oeufs et larves d Anchois ichthyop (IRD ; ifremer/previmer) 18

19 Projet SARDONE Transport des oeufs et larves d Anchois ichthyop (IRD ; ifremer/previmer) 19

20 PROJET CLARAII Pollution chimique en Mer FastMars - Corse - Mer ligure - Golfe de Gêne - Golfe du Lion - Mer catalane - choix de la zone par simple click dans googlemap 20

21 PROJET CLARAII Pollution chimique en Mer Choix du point de rejet par simple click ou par ses coordonnées géographiques 21

22 Rejet 08-Mars-2007 Rejet urbain de Marseille (Cortiou) Modélisation Off-line Traceur dissous particules 22

23 Merci Caparmor MENOR est une grosse configuation (1100*460*30) Qui est utilisée sur plusieurs projets de recherches ou d application. Qui tourne en MPI grâce au support de Tina Odaka. Qui sera gourmande en CPU (assimilation utilisant une méthode d ensemble) Qui pourrait être interressé par PALM (couplage avec la biologie, la houle) 23