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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 10 Go O(2h) 2 simulations/blade (2 cores, 8 in OpenMP sections)
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
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…)
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
shelf gauges deep gauges
coastal gauges
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
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
Resolution reworking
faulty mesh correction
resolution increase
FES2012
Loading self-attraction Muriel Lubes,
Damien Allain
Latest experiments State of the art FES2012 FES2013
M2 24 / 93 13 / 53
S2 10 / 28 9 / 22
K1 11 / 30 10 / 23
O1 12 / 30 7 / 19
FES2012 reference June 2012
comparisons against TP/J1/J2 (deep / shelf)
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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