Product: Ocean Center of Mass
CM - ECCO_kf080i - Version metadata

CM - ECCO_kf080i

2020-08-12

ECCO_kf080i

oceanic center-of-mass (COM)
Ocean model : ECCO (based on MITgcm)
Horizontal domain : 80 degrees South to 80 degrees North latitude
Horizontal resolution : 1/3 degree at equator to 1 degree at high latitudes by 1 degree longitude
Vertical resolution : 46 levels ranging in thickness from 10 m at surface to 400 m at depth
Boussinesq model? : Yes
Tabulated COM corrected for volume changes due to steric effects? : No
(correction is negligibly small, being 6 orders of magnitude smaller than the COM variations)

Ocean model forcing :
Surface wind stress : 12-hour NCEP/NCAR reanalysis
Surface heat flux : Daily NCEP/NCAR reanalysis
Surface freshwater flux : Daily NCEP/NCAR reanalysis (freshening only)
Surface pressure : None

Data assimilated : Altimetric measurements of sea surface height and XBT data

File units : meters 1. The tabulated date corresponds to the midpoint of the 1-day-long averaging interval.

2. The mean has been removed from the tabulated COM values.
The mean oceanic COM (m; x,y,z) = -7.65137016E+05 -4.69378616E+05 -9.60916152E+05

3. The mass of the ocean model is 1.366125999072050E+021 kg.
This ocean mass can be used to convert the COM values given here to geocenter values.

4. The tidal contamination present in previous versions of the ECCO/JPL data assimilative ocean
models (e.g., kf049f,kf066b) is not present in this model. For a discussion of this problem see
Gross, An Improved Empirical Model for the Effect of Long-Period Ocean Tides on Polar Motion,
Journal of Geodesy, vol. 83(7), pp. 635-644, doi:10.1007/s00190-008-0277-y, 2009.

5. A problem with assimilating altimetric data in kf080 has been fixed here.

1-day averages

1993-01-02

2020-03-30

9950

MJD, COM_X, COM_Y, COM_Z

ASCII

Irregular

Geophysical fluids, COM

GGFC Special Bureau for the Oceans

Richard.Gross@jpl.nasa.gov

onLine

ftp://ig2-dmz.gfz-potsdam.de/GGFC-Oceans/COM/ECCO_kf080i.cm