GODAE Progress on national activities France (Mercator Ocean) Eric Dombrowsky - Mercator Océan

Eric Dombrowsky - IGST St John's - August 2007 French Contributions to operational oceanography n Ocean forecasting center –MERCATOR OCEAN n Data Centers –The SSALTO/DUACS altimeter data center (  connected to OSTST) –The CORIOLIS in situ data center (  connected to ARGO,...) –The SST center (SAF/MétéoFrance, Ifremer) (  connected to GHRSST) n Modelling tools –NEMO ocean code (  CNRS / Mercator Ocean / UK Met Office) n Research –Assimilation, Modelisation, data ; Large ocean / regional / coastal –The Mercator/Coriolis Science Working Team n Projects –The AltiKa project (space mission for altimetry) –The Mersea project n …

Eric Dombrowsky - IGST St John's - August 2007 Mercator Model Configurations n BASIN rigid lid (OPA8.1 based) –1/3° North & Tropical Atlantic ; 43 levels (abandoned) –1/15° North Atlantic + 1/16° Med Sea ; 43 levels n BASIN free surf. (NEMO Based) –¼° North Atlantic + MED 50 levels –1/12° North Atlantic + Med Sea ; 50 levels n GLOBAL Ocean (free surface) –2° Global Ocean OPA8; 30 levels –¼° Global Ocean OPA8; 46 levels –¼° Global Ocean NEMO; 50 levels –1/12° Global Ocean NEMO; 50 levels (full transition to NEMO on ORCA grids under development) Mercator Assimilation Systems (SAM) n SAM1 (ROOI-SOFA type) –V1 : R.O.O.I. - surface analysis / altimeter data – multivariate forecast correction using lifting and lowering of the water column for T and S –V2 : R.O.O.I. - multivariate analysis using vertical multivariate EOFs / alti. + STT+ in-situ data n SAM2 (SEEK type) n SAM3 (3D/4DVar type) using the PALM coupler (CERFACS) Observation data QC, editing and blending using OI n ARMOR/SURCOUF : ¼° Global Ocean 3D analysis Mercator model configurations and data assimilation systems

Eric Dombrowsky - IGST St John's - August 2007 SSALTO/DUACS CORIOLIS Altimetry In Situ NWP ECMWF,... Topex/Poseidon, ERS-2, GFO, Jason-1, Envisat ARGO data, XBT/CTD, buoys, moorings,... wind stress, heat fluxes, E-P : atm. model outputs - real-time : weekly retrieval of operational ECMWF 6 hour analyses, and 10 day forecasts ; RTG SST - delayed mode : reanalysis - near-real-time : weekly retrieval of XBT, CTD, buoys, etc - delayed mode : off-line retrieval of fully validated data set - near-real-time : weekly retrieval of intercalibrated Along-Track Sea Level Anomalies - delayed mode : off-line retrieval of fully validated data set MERCATOR Assimilation Center Input data

Eric Dombrowsky - IGST St John's - August 2007 The forecasting systems running at MERCATOR n 1/15° / 43 levels N.Atlantic & Med Sea –Operational ; 2 week-forecast; alti/SST/insitu assimilation. 1/15° n 2° / 30 levels Global Ocean –Operational ; 2 week-forecast ; altimetry assimilation. –Simulations : one reanalysis 10 years –Demo : with SEEK and 3D4DVar 2° n 1/4 ° / 50 levels Global Ocean –Operational ; 2 week-forecast ; altimetry + T/S profiles + SST assimilation. –Operational, with reanalysis planned, ARMOR 3D Data blending. ¼°

Eric Dombrowsky - IGST St John's - August 2007 Global ocean system upgrades since last meeting n New model configuration: NEMO on ORCA grid –NEMO (OPA9) + LIM (Ice model) –Free surface, partial cells, 50 levels, ¼° ORCA grid –Offline coupling to ecosystem (PISCES) under development n New assimilation system: SAM2 based on SEEK filter –No longer based on optimal interpolation : SEEK filter (3D EOFs) –Alt + T/S profiles + SST data assimilated –MSSH from RIOv5, Rio et al. (2006) –Bulk formulae for atmospheric forcing (ECMWF) n Operational since April 2007

Eric Dombrowsky - IGST St John's - August 2007 Examples of improvements: Surface currents in the North Atlantic Old ¼° 1/15° new ¼° surface currents from Altimetry + Ekman drift from ECMWF winds

Eric Dombrowsky - IGST St John's - August 2007 Zoom in the Gulf Stream Region new ¼° surface currents from Altimetry + Ekman drift from ECMWF winds

Eric Dombrowsky - IGST St John's - August 2007 Examples of improvements: Surface temperature in the tropical Pacific NOAA/RTG observed SST products (assimilated in the new system): new ¼° Old ¼°

Eric Dombrowsky - IGST St John's - August 2007 Examples of improvements: NATL Salinity at 100m new ¼° optimal iterpolation of observations 1/15° Old ¼°

Eric Dombrowsky - IGST St John's - August 2007 Sea ice concentration: April OSI SAF data Mercator System new ¼° new ¼°

Eric Dombrowsky - IGST St John's - August 2007 Towards global 1/12° n ORCA 1/12° configuration (same general setup as the ¼°): developed and already tested n Mercator Océan has acquired a new computer dedicated to the development of this new configuration. n 2007: –Improvements of the forcing function: tests of MEMO BULK formulae in a North Atlantic zoom –Interannual simulation n 2008: –Demonstration of real-time operations (April, Mersea IP framework) –Operational start (MCS, MyOcean framework)

Eric Dombrowsky - IGST St John's - August year sea surface topography 1/12° forced run

Eric Dombrowsky - IGST St John's - August 2007 ORCA12 SSH, 2001 variability and mean ORCA12 ALTIMETRY

Eric Dombrowsky - IGST St John's - August 2007 Towards daily updates of operational forecast n Study underway for the use of HR forcing (3h, 6h) n Study underway to setup the operational scenario –From daily update of forcast including atm forcing updates to full daily assimilation n April 2008: start of a demo system in the North Atlantic and Mediterranean n August 2008: daily operational service

Eric Dombrowsky - IGST St John's - August 2007 Downscaling to regions n Technical implementation of routine open boundary data delivery to MERSEA regional systems (routine since April 2007) –UKMO (Natl), INGV (Med) n Development/tests of open boundary schemes within NEMO n Tests in the Bay of Biscay conducted at Mercator Ocean

Eric Dombrowsky - IGST St John's - August 2007 Global ¼° reanalysis project n With the global ¼° model config and multidata assimilation –ORCA025-LIM + SAM2 (SEEK) n 2007/2008: first stream: – (ARGO years) n 2008/2009 second stream: – (Modern altimetry years) n 2009/2010: third stream: –50 years (ERA40 period ) n International collaboration within MyOcean –DFO (Canada), ESSC (UK), CMCC (Italy), CNRS and Mercator Ocean (France)