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ECCO Adjoint method - routine global ocean data assimilation system
A state-of-the-art assimilation system is being employed consisting of : as complete a set of extant observations as possible
global high-resolution primitive equation model with advanced physics and numerics
advanced assimilation schemes based on estimation and control theory.
The ECCO-2 employs the MITgcm in a near-global domain
(78S~78N). Model resolution is 1 deg. except within the tropics where meridional resolution gradually decreases to 0.3-deg within 10-deg of the Equator. There are 46 levels in the vertical with 10m-resolution within 150m of the surface. (Total grid dimension is 360*224*46 = 4*10^6.) 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.
Model fields are available at 10-day intervals (10-day averages). Sea level and ocean bottom pressure are also available at 12-hour intervals (instantaneous values).
The adjoint method is used for :
- Periodic optimization stricter than the approximate Kalman filter
- Physical sensitivity analyses of key processes
| Variables | temperature (°C), salinity (ppt), sea level (m), u velocity (m/s), v velocity (m/s) |
| Zonal | Global by varies |
| Meridional | Global by varies |
| Vertical |
0 to 6000 by varies m |
| Temporal | Jan 1997 to Dec 2000 by 10 day(s) |
| Static? | yes |
| Volume | external |
| Server | public:   Remote rate: |
| Source | http://www.ecco-group.org/ |
| Acquired | Jan 1, 2005 |
| APDRC contact | Zuojun Yu |
| Supplements | info |
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