Oct 5, 2017 New version online: due to modified initial conditions for the year 2011, the years from 2011-2014 were updated.
Nov 27, 2015 New Version online that replaced the previous one: Since the year 2014 used a wrong scaling factor for precipitation, the last assimilation window 2011-2014 was repeated after correcting the error.
RESTRICTED only accessable in CEN/MPI net or via CliSAP login What does that mean?
Data access via file system: /data/icdc/ocean_syntheses/GECCO2
The GECCO2 ocean synthesis is the German contribution of the Estimating the Circulation and Climate of the Ocean project (ECCO, www.ecco-group.org). The synthesis uses the adjoint method to adjust the initial temperature and salinity in 1948 together with the air temperature, humidity, precipitation, and zonal and meridional wind every 10 days to bring the model into consistency with the data, which derive from the EN3v2 data base AVISO along track SLA , GOCO mean dynamic topography, HadISST, AMSRE SST, and the WOA09 climatology. The global model is based on the MITgcm model, has 50 levels, and uses zonally 1 degree and meridionally varying higher resolution. The background atmospheric state is taken from the 6 hourly NCEP/NCAR Reanalysis 1.
Coverage, spatial and temporal resolution
Period and temporal resolution:
Coverage and spatial resolution:
Variational method fit the trajectory best during the middle section of the assimilation period. Due to the separation of the run into 5 year long windows with one year overlap, adjustments show some dependence on the time within each window, which are noticeable in regions of stronger adjustments, particularly at the latitudes of the strong western boundary currents. Despite the initial iterations that cover the whole period, a four year periodicity of the corrections results from this dependence of the adjustment that affects interannual variability.
Further information about the 4-year-cycle can be found in this PDF document.
Armin Köhl: armin.koehl (at) uni-hamburg.de
Remon Sadikni (ICDC): remon.sadikni (at) uni-hamburg.de
Köhl, A. (2015), Evaluation of the GECCO2 Ocean Synthesis: Transports of Volume, Heat and Freshwater in the Atlantic, Q. J. R. Met. Soc., 141(686), 166-181, doi: 10.1002/qj.2347
Please contact Armin Köhl: armin.koehl (at) uni-hamburg.de