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Assimilation characteristics

The table below describes the assimilation methods and assimilated variables, the GODAE oceanView systems are employing.

SystemAssimilation SchemeSSTSSHOther
BLUElink

latest update from 2014
BODASv8.3


BODAS
WindSAT, NAVO (AVHRR), NOAA-18, MetopA,, NOAA-19

AMSR-E, Pathfinder, NAVO
Jason2, Cryosat-2, SARAL/AltiKa IGDR data streams

Along-track altimetry (all altimeters)
Adaptive Non-linear Dynamical Initialisation (T,S,u,v,η)
CONCEPTSRegional: SAM2 (SEEK); Ice 3DVar-FGAT ((5km analysis grid)


Global Ocean: SAM2 (similar to Mercator – PSY3V2R2); Ice: 3DVar-FGAT (10km)

Gulf of St Lawrence: Ice: Direct insertion of RadarSAT image analyses from the Canadian Ice Service
CCMEP SST Analysis (0.2deg OI)AVISOCoriolis/CLS (in situ T&S) as well as sea ice data from satellite sources (AMSR, AVHRR, MODIS, Radarsat) and ship reports.
ECCO groupAdjoint, Kalman filter/smoother, Green’s functionAMSR-E, TMI, AVHRRAlong-track TOPEX/Poseidon, Jason1 & -2, ENVISAT, GFO, ERS-1 & -2, tide gaugesXBT, CTD, Argo, TOGA-TAO, SSM/I (sea ice), GRACE, scatterometers, sea surface salinity, Florida Current transport
ECMWF

latest update from 2014
NEMOVARHadISST2 v2 pentad ¼ degree until 2008, and OSTIA thereafterAVISO along track sea level anomalies and global mapsSIC: OSTIA reanalysis until 2008, OSTIA operational thereafter; XTB,CTD,Argo,Moorings from the EN4 (XBT corrected) data set until 2016 and from the GTS thereafter
FOAM

latest update from 2014
NEMOVAR (3DVar-FGAT)GHRSST data including AVHRR from NOAA and MetOp. Also in situ surface data from ships, moored buoys and drifting buoysAlong-track satellite altimeter data from Aviso, including Jason-2 and Cryosat-2 dataAll available in situ temperature and salinity data including XBTs, Argo, CTDs, moored buoys, gliders, marine mammals; SSM/I sea-ice concentration data from EUMETSAT OSI-SAF
HYCOM/NCODA GOFSNavy Coupled Ocean Data Assimilation (NCODA): 3DVARNOAA-18, NOAA-19, METOP-A, METOP-B, GOES-13, GOES-15, MSG, COMS-1, MTSAT-2, WindSAT, NPP-VIIRS, drifting buoys, fixed buoys, ships (ERI, bucket, hull contact)Jason-2, Altika, Cryosat-2In situ profiles, (Argo, gliders, XBTs, fixed and drifting buoys, CTDs), sea ice concentration (SSM/I, SSMIS).
INDOFOSINCOIS-GODAS 3D-Var
INDOFOS LETKF
HOOFS no assimilation ITOPS (Tendral Statistical Interpolation Scheme) T-SIS
Weekly Reynolds SST (GODAS)AVISO (HyCOM)T,S profiles (ARGO, XBT, XCTD, moored buoys) in GODAS
Mercator Ocean"Mercator Assimilation System” version 2 (SAM-2), reduced-order Kalman filter based on the SEEK formulation with a 3DVAR bias correction for temperature and salinityReynolds AVHRR 0.25° SSTSSALTO/DUACS along track SLA (AVISO), Mean Dynamic Topography constructed with CNES_CLS09 MDT and GLORYS reanalysisin-situ T/S profiles from Coriolis GDAC. CORA data base for reanalysis; sea-ice concentration from CERSAT
MFS

latest update from 2014
3DVAR (OCEANVAR)L4 daily maps Only nudging (variational assimilation)L3 Along track sub-sampled data (every second point)XBTs, Argo, CTDs. GLIDER are pre-operational; L3 Chl maps (5 days mean)
MOVE/MRI.COM3DVAR (Global, North Pacific), 4DVAR (Western North Pacific, Japan Area, Seto-Inland Sea) with EOF decomposition, quasi-Newton methods, FGAT, a bias correction scheme and variational dynamic QCMGDSST (JMA-GHRSST product), COBE-SST for GLBJason-2 (realtime operation) T/P, Jason 1,2, ERS-1,2, ENVISAT, GFO, Crysosat-2 and SARAL (hindcast)Argo, TAO/TRITON, GTS (T/S), SSS from Aquarius, SIC from SSM/I
NMEFCNEMO: LESTKF

EnOI for SLA, 3DVar for SST and T/S profiles

Ensemble OI

OVALS
OSTIA SST

MGDSST

Reynolds SST
Sea level anomaly from CLS; Along-track sea level anomaly from CLS, including Jason-2/3, Altika, Cryosat-2, Sentinel-3a data.T&S Argo profiles, XBT
REMOEnOI and Cooper and HainesOSTIAAlong-track SLA NRT CMEMS/AVISO L3Argo T/S vertical profiles
RTOFSNRL / NAVOCEANO NCODA (See USA-HYCOM for details), 2+1DVarSee USA-HYCOMSee USA-HYCOMSee USA-HYCOM
TOPAZDEnKF (Sakov and Oke 2008), 100 dynamical membersL4 data from CMEMS SST TAC (OSTIA)Along track SLA from CMEMS SL TACSSM/I from CMEMS SI TAC (OSI-SAF), Temp and Salinity profiles from CMEMS Arctic in-situ TAC (including Argo floats, CTD sections, ITPs),Sea ice drift from CMEMS SI TAC (OSI SAF product).