Product: Oceanic Excitation Functions
EAMF (OAM) - ECCO_kf080g - Version metadata
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ECCO_kf080g.chi| Title | EAMF (OAM) - ECCO_kf080g |
| Volume | ECCO_kf080g |
| Date | 2018-04-06 |
| Content | Global oceanic excitation functions (mass and motion terms) 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 mass term corrected for volume changes due to steric effects? : Yes 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 |
| Documentation | File units : milliarcseconds (mas) for chi-x and chi-y, milliseconds (ms) for lod 1. The tabulated date corresponds to the midpoint of the 1-day-long averaging interval. 2. The mean has been removed from the tabulated excitation values. The mean chi mass term (mas,mas,ms; chi-x,chi-y,lod) = 1.64265646E+06 1.24061125E+06 3.69504072E+04 The mean chi motion term (mas,mas,ms; chi-x,chi-y,lod) = -1.83623869E+01 1.14766184E+01 1.58364920E-01 3. The oceanic excitation functions have been computed from the oceanic angular momenta by Equations (4) and (6) of Gross et al., Atmospheric and Oceanic Excitation of Decadal-Scale Earth Orientation Variations, J. Geophys. Res., vol. 110, B09405, 2005. 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 in kf080g. |
| Time Interval | 1-day averages |
| Time Start | 1993-01-02 |
| Time End | 2015-12-16 |
| Data Points | 8384 |
| Data | MJD, mass_chiX, mass_chiY, mass_LOD, motion_chiX, motion_chiY, motion_LOD |
| Format | ASCII |
| Frequency | Irregular |
| Keywords | Geophysical fluids, excitation functions |
| Reference | - |
| Published by | GGFC Special Bureau for the Oceans |
| Contact | Richard.Gross@jpl.nasa.gov |
| Distribution | onLine |
| Source | ftp://rz-ftp2.gfz.de/2025012844000415-esmdata/Products/GGFC-Oceans/CHI/ECCO_kf080g.chi |