Overview and current status of the Mersea project and system Eric Dombrowsky - Mercator Océan

IGST-12 - St John's - August 2007 The MERSEA Integrated Project n Development of a European system for operational monitoring and forecasting of the ocean physics, biogeochemistry, and ecosystems, on global and regional scales n A European Commission FP6 Project (Space-GMES) n 4-year project (2004 –2008) n 38 contractors, 16 countries

IGST-12 - St John's - August 2007 Work Breakdown Structure n 13 workpackages: –WP1 coordination: IFREMER, France –3 WPs dedicated to input data –2 WPs for system design and assessment, and for information system activities –2 WPs for R&D: model+assim and evaluation –2 WPs for implementation and production including downscaling –2 WPs for service and demonstrations: special focus experiments and user involvement: oil and gas industry, ship routing and waves, oil spill drift –WP13: overall asessment

IGST-12 - St John's - August 2007 Cyprus FDMR Denmark DMI U.E JRC Finland U-HEL France ASP BOOST CLS CNRS Ifremer Mercator Océan Météo France [+ Canada :] DFO Germany AWI GeoB IFM/Univ. Kiel IFM/Univ. Hamburg Greece : HCMR Ireland : Techworks Italy : CNR-ISAC CNR-ISSIA CoNISMA ENEA INGV OGS Netherlands : MARIS Univ. Utrecht Norway : met no NERSC Spain : CSIC IEO Turkey : IMS UK : NERC-SOC Ocean Numerics PML NERC-POL The Met Office Univ. Reading Univ. Southampton International : ECMWF EuroGOOS membersOperational agencies or services providers MERSEA Project Participants

IGST-12 - St John's - August 2007 Bologna Emilia Romagna Copenhagen Oresund Bergen Hordaland Exeter Devon Toulouse Midi-Pyrénées The MERSEA Integrated System, a European capacity for Ocean Monitoring and Forecasting NEA -North NW Shelves ARCTIC BALTIC SEA MED SEA GLOBAL NEA - South

IGST-12 - St John's - August 2007 Area 1 Global Area 2: North East Atlantic Area 5 Med Sea Area 3 Arctic Area 4 Baltic

IGST-12 - St John's - August 2007 Mersea Development n We are currently in the Target Operational Period #2: TOP2 –6 month period starting in April 2007 n System has evolved from V0 (start of the project) to V1 for TOP1 (Oct 2005), and to version 2 for TOP2, final version 3 will be completed in April 2008 –V0 was the preexisting “patchwork” (Apr 2004) –V1 transformed this “patchwork” into a “network” (Oct 2005) Scientific improvements Coordination of validation activities Sharing of tools and expertise Development of the information management system Links to users through development and demonstration of services –V2 made it evolve towards an real integrated system (Apr 2007) Downscaling from global to regions with boundary data provision Links to common data providers More homogeneous data delivery –V3 is the target fully integrated system (Apr 2008) Full integration from global to regions Links to users through services Starting point for MyOcean

IGST-12 - St John's - August 2007 NERSC Arctic system Version v.2: content and status n HYCOM km configuration with sea-ice model for Arctic and North Atlantic –Weekly operation –analyses & 14-day forecasts n Ensemble Kalman filter assimilation scheme –Uses altimeter data, SST and sea-ice concentration & drift data –Does not use in situ T&S profile data n Further development of v.2 for v.3 –Work on nesting of TOPAZ into global Mersea system has started

IGST-12 - St John's - August 2007 NERSC Arctic system Developments for version v.2 n Agreement between NERSC and National Meteorological Institute: Terms and conditions of operations of TOPAZ at Met.No. Concluded 30 March 2007 n Ice drift velocity data assimilation implemented n Higher horizontal resolution: km replacing km n Ecosystem simulation shown to be relatively insensitive to assimilation of altimeter data n Port of system to new super-computer

IGST-12 - St John's - August 2007 DMI Baltic system Version v.2: content and status n 3NM North Sea & 0.5 NM Danish Strait configurations –DMI version of BSH c-mod ocean & sea-ice model –Three configurations coupled by two-way nesting n Twice daily operation –forecasts to 60 hours ahead n SST assimilation scheme n Lateral boundary data in North Sea from climatology

IGST-12 - St John's - August 2007 DMI Baltic system Developments for version v.2 n Increased resolution –Doubled horizontal resolution and improved vertical resolution –North Sea grid spacing: 3NM (5km) in horizontal; 2 m in vertical –Danish Straits grid spacing: 0.5 NM (900 m); 1 m n Mixing parameterizations –Horizontal dissipation revised to avoid current divergence –K-  vertical mixing scheme represents breaking surface & internal waves –Much sharper pycnocline obtained at some stations n Attempted to use lateral boundary data from north-east Atlantic –Problems because of differences in bathymetry in Norwegian Trench (recall that models use s-coords and hence are smoothed) n SST data assimilation implemented –uses simplified Kalman filter (Larsson et al 2007) n System optimized for AMD Opteron computer

IGST-12 - St John's - August 2007 INGV Mediterranean system Version v.2: content and status n 1/16 o, 72 level configuration (with revised Atlantic domain) –NEMO ocean models with 72 layers n Daily forecasts and weekly analysis updates –10-day forecasts n Multi-variate 3D variational assimilation scheme –Uses in situ T&S profile data & SST analysis –Uses SSH data with revised Rio MDT n Nesting into to global system –Mechanics for nesting in global model have been set up –A parallel version is run nested in v.2 global

IGST-12 - St John's - August 2007 INGV Mediterranean system Developments for version v.2 n Converted ocean model from OPA 8.1 to NEMO n Preparations to nest within Mercator global system n New assimilation scheme –multi-variate 3D variational scheme (with some novel approaches) –Uses in situ T&S, SST, SSH n Revisions to mean dynamic topography