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Assimilation characteristics

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

SystemAssimilation SchemeSSTSSHOther

latest update from 2014

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

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

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).
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

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

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

Ensemble OI



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
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).