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