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ECCO Kalman Filter - routine global ocean data assimilation system
TOPEX/Poseidon sea-level anomalies are assimilated into the MITgcm
using a Kalman filter (Fukumori, 2002). The GM isentropic mixing scheme
(Gent and McWilliams, 1990) and the KPP mixed-layer formulation (Large
et al., 1994) are employed. The model is forced by NCEP reanalysis
products (12-hourly wind stress, daily diabatic air-sea fluxes) with
time-means replaced by those of COADS. Temperature and salinity at the
model sea surface are further relaxed towards observed values.
The assimilation assumes model errors are associated with inaccuracies
in time-varying NCEP wind product. The filter estimates consist of
large-scale adiabatic adjustments of the model state.
Dual Kalman filter is used to the following reasons:
- Routine (semi-operational) assimilation at the highest possible resolution, and
- Calibration of prior errors (weights)
| Variables | temperature (°C), salinity (ppt), sea level (m), u velocity (m/s), v velocity (m/s) |
| Zonal | Global by 1 deg |
| Meridional | Global by 1 deg, 0.3 deg between 10S and 10N |
| Vertical |
0 to 6000 in 46 levels, 10m-resolution for the top 150m |
| Temporal | Jan 1993 to March 2008 by 10 day(s) |
| Static? | yes |
| Volume | external |
| Server | public:   Remote rate: |
| Source | http://www.ecco-group.org/ |
| Acquired | Jan 1, 2005 (updated: April 2008) |
| APDRC contact | Zuojun Yu |
| Supplements | ecco2 |
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