GODAE Progress on national activities France (Mercator Ocean)
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Transcript of GODAE Progress on national activities France (Mercator Ocean)
GODAE Progress on national activitiesFrance (Mercator Ocean)
Eric Dombrowsky - Mercator Océan
Eric Dombrowsky - IGST St John's - August 2007
French Contributions to operational oceanography
Ocean forecasting center– MERCATOR OCEAN
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)
Modelling tools– NEMO ocean code ( CNRS / Mercator Ocean / UK Met Office)
Research– Assimilation, Modelisation, data ; Large ocean / regional / coastal– The Mercator/Coriolis Science Working Team
Projects– The AltiKa project (space mission for altimetry)– The Mersea project
…
Eric Dombrowsky - IGST St John's - August 2007
Mercator Model Configurations BASIN rigid lid (OPA8.1 based)
– 1/3° North & Tropical Atlantic ; 43 levels (abandoned)
– 1/15° North Atlantic + 1/16° Med Sea ; 43 levels
BASIN free surf. (NEMO Based)– ¼° North Atlantic + MED 50 levels– 1/12° North Atlantic + Med Sea ; 50
levels 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)
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
SAM2 (SEEK type)
SAM3 (3D/4DVar type)
using the PALM coupler (CERFACS)
Observation data QC, editing and blending using OI 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 ofoperational 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
1/15° / 43 levels N.Atlantic & Med Sea– Operational ; 2 week-forecast; alti/SST/insitu assimilation.
1/15°
2° / 30 levels Global Ocean– Operational ; 2 week-forecast ; altimetry assimilation.– Simulations : one reanalysis 10 years– Demo : with SEEK and 3D4DVar
2°
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
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
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)
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 StreamRegionnew
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 5 2007
OSI SAFdata
MercatorSystem
new
¼°
new
¼°
Eric Dombrowsky - IGST St John's - August 2007
Towards global 1/12°
ORCA 1/12° configuration (same general setup as the ¼°): developed and already tested
Mercator Océan has acquired a new computer dedicated to the development of this new configuration.
2007:– Improvements of the forcing function: tests of MEMO BULK
formulae in a North Atlantic zoom– Interannual simulation 1998-2007
2008:– Demonstration of real-time operations (April, Mersea IP framework)– Operational start (MCS, MyOcean framework)
Eric Dombrowsky - IGST St John's - August 2007
1 year sea surface topography 1/12° forced run
Eric Dombrowsky - IGST St John's - August 2007
ORCA12 SSH, 2001 variability and mean
ORCA12 ORCA12
ALTIMETRY ALTIMETRY
Eric Dombrowsky - IGST St John's - August 2007
Towards daily updates of operational forecast
Study underway for the use of HR forcing (3h, 6h) Study underway to setup the operational scenario
– From daily update of forcast including atm forcing updates to full daily assimilation
April 2008: start of a demo system in the North Atlantic and Mediterranean
August 2008: daily operational service
Eric Dombrowsky - IGST St John's - August 2007
Downscaling to regions
Technical implementation of routine open boundary data delivery to MERSEA regional systems (routine since April 2007)– UKMO (Natl), INGV (Med)
Development/tests of open boundary schemes within NEMO
Tests in the Bay of Biscay conducted at Mercator Ocean
Eric Dombrowsky - IGST St John's - August 2007
Global ¼° reanalysis project
With the global ¼° model config and multidata assimilation – ORCA025-LIM + SAM2 (SEEK)
2007/2008: first stream: – 2002-2007 (ARGO years)
2008/2009 second stream: – 1993-2007 (Modern altimetry years)
2009/2010: third stream: – 50 years (ERA40 period 1979-2007)
International collaboration within MyOcean– DFO (Canada), ESSC (UK), CMCC (Italy), CNRS and Mercator
Ocean (France)