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Non-Tidal Ocean Excitation Functions
Non-tidal ocean excitation functions (CHI) can be readily integrated into polar motion by means of the Liouville equation. Excitation functions consider the rotational deformation of the Earth and its associated passive response of equilibrium oceans, the relative angular momentum of the Earth's core, and the effects of mantle anelasticity. CHI is linearly derived from non-tidal ocean angular momentum as described by Gross (2009).
Operational Series
| Name | Ocean Model | Data Span | Resolution | Latency | Comments |
|---|---|---|---|---|---|
| ESMGFZ v1.2 | MPIOM | Jan 1976 to present | 3 hours | 1 day | IB removed |
Ocean Model Experiments
Name | Ocean Model | Data Span | Resolution | Comments |
|---|---|---|---|---|
| c20010701.chi | MITgcm | Jan 1980 to Mar 2002 | 1 day | - |
| ECCO_50yr.chi | MITgcm | Jan 1949 to Dec 2002 | 10 days | - |
| ECCO_kf066a2.chi | MITgcm | Jan 1993 to Dec 2008 | 1 day | - |
| ECCO_kf066b.chi | MITgcm | Jan 1993 to Dec 2008 | 1 day | - |
| ECCO_kf079.chi | MITgcm | Jan 1993 to Mar 2020 | 1 day | - |
| ECCO_kf080i.chi | MITgcm | Jan 1993 to Mar 2020 | 1 day | - |
All available experiments can be downloaded here.
*FWF: Net-effects of freshwater fluxes from continental (and atmospheric) storages into the oceans are explicitly considered.
Gross, R. S. (2009), Earth Rotation Variations -- Long Period, In: Herring, T. (ed.), Treatise on Geophysics, Volume 3: Geodesy, p. 239-294, Elsevier, Amsterdam.