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FES 2012 4th PROJECT MEETING…

FES 2012 4th PROJECT MEETING…. F. Lyard, L. Roblou, D. Allain. Status and actions : T-UGOm. Developments Latitude-dependent g Full non-linear solver tests Linear/quadratic friction NCP1xLGP2 & NCP1xLGP2 time stepping optimisation Loading/self-attraction software Computing performances 

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FES 2012 4th PROJECT MEETING…

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  1. FES 20124th PROJECT MEETING… F. Lyard, L. Roblou, D. Allain

  2. Status and actions : T-UGOm • Developments • Latitude-dependent g • Full non-linear solver tests • Linear/quadratic friction • NCP1xLGP2 & NCP1xLGP2 time stepping optimisation • Loading/self-attraction software • Computing performances  • 10 Go • O(2h) • 2 simulations/blade (2 cores, 8 in OpenMP sections)

  3. Status : EnOI Developments Code refurbished Netcdf formats IO, DNP1xLGP2 discretisation OpenMP optimized Members decorrelation implementation Quick diagnostic mode Computing performances 30 Go (elevation only) O(20h) Additional LEGOS computing facilities needed

  4. Actions • T-UGOm developments continue • Assimilation • Data selection/decimation • Validation database (tide gauge): • time series re-analysis • outliers removal • redundancy removal • split in 4 specific databases: • open ocean • shelf seas • coastal seas • ultra-coastal zones (estuarines, etc…)

  5. Tide gauge validation database Linked with Stammer inter-comparison project Retreated data: Deep ocean: DARTS, ACCALAIM, GLOUPS Shelf Seas: ROSAME, GLOUPS Coastal Seas: GLOSS, SONEL, BODC coastal gauges shelf gauges deep gauges

  6. FES2012 accuracy limiting factors Bathymetry ETOPO-1 was a bad choice Updated from Smith&Sandwell-v14 Lack of resolution ? limited by project computational facilities not sufficient in some places Linear/non-linear friction ? Spectral solver limitations Loading/self-attraction precision/accuracy

  7. Bathymetry • Patching still underway (version 25) • Atlantic anomaly • too much energy dissipated in Hudson Strait and Bay • Ungava Bay bathymetry issue: local M2 resonance • spectral solver limitation ? • regional model study underway

  8. Resolution reworking • faulty mesh correction • resolution increase FES2012

  9. Loading self-attraction • Muriel Lubes, Damien Allain

  10. Latest experiments State of the art comparisons against TP/J1/J2 (deep / shelf) FES2012 reference June 2012

  11. FES2013 ? Many new softwares and approaches have been developped but not fully deployed in FES2012… Accuracy in shelf/high latitude seas is the true challenge Much better prior solutions bathymetry T-UGOm improvements increased resolution on shelf breaks and ridges … Enhanced ensemble members capitalize on FES2012 experience improved de-correlation techniques (singular values threshold) Improved data: CTOH coastal data assimilation GLORYS correction extension

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