GODAE Progress on national activities France Mercator Ocean

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GODAE Progress on national activitiesFrance
(Mercator Ocean)

• Eric Dombrowsky - Mercator Océan

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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

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Mercator model configurations and data
assimilation systems

• 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)

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

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Examples of improvements Surface currents in
the North Atlantic
Old ¼
1/15
surface currents from Altimetry Ekman drift
from ECMWF winds
new ¼
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Zoom in the Gulf StreamRegion
new ¼
surface currents from Altimetry Ekman drift
from ECMWF winds
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Examples of improvements Surface temperature in
the tropical Pacific
Old ¼
new ¼
NOAA/RTG observed SST products (assimilated in
the new system)
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Examples of improvements NATL Salinity at 100m
Old ¼
1/15
optimal iterpolation of observations
new ¼
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Sea ice concentration April 5 2007
Mercator System
OSI SAF data
new ¼
new ¼
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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)

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1 year sea surface topography 1/12 forced run
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ORCA12 SSH, 2001 variability and mean
ORCA12
ORCA12
ALTIMETRY
ALTIMETRY
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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

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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

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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)