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

…


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


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


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°


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


Examples of improvements: Surface currents in the North Atlantic

Old

¼°1/15°

new

¼°

surface currents from Altimetry + Ekman drift from ECMWF winds


Zoom in the Gulf StreamRegionnew

¼°

surface currents from Altimetry + Ekman drift from ECMWF winds


Examples of improvements: Surface temperature in the tropical Pacific

NOAA/RTG observed SST products (assimilated in the new system):

new

¼°

Old

¼°


Examples of improvements: NATL Salinity at 100m

new

¼°optimal iterpolation of observations

1/15°Old

¼°


Sea ice concentration: April 5 2007

OSI SAFdata

MercatorSystem

new

¼°

new

¼°


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)


1 year sea surface topography 1/12° forced run


ORCA12 SSH, 2001 variability and mean

ORCA12 ORCA12

ALTIMETRY ALTIMETRY


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


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


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)

Documents

GODAE Progress on national activities France (Mercator Ocean)