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| Titel |
OMCT - New time-series for oceanic mass, angular momentum and sea level variability |
| VerfasserIn |
H. Dobslaw, M. Thomas, I. Bergmann, S. Esselborn, F. Flechtner, L. Zenner |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250067849
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| Zusammenfassung |
| Non-tidal ocean dynamics acting on a wide range of time-scales are imprinted on various geodetic observables including time-variable gravity changes, variations in the Earth's rotation, and changes in sea-level. Independent numerical model estimates, ideally available with short latency, are frequently required to validate, process or interpret those measurements.
While OMCT is routinely used to de-aliase short-term non-tidal ocean mass variability in the GRACE gravity field processing for some years now, we here present an updated model version. This configuration is discretized on regular 1° grid with 20 vertical layers, has a time-stepping of 20 min and includes various numerical adjustments that led to an improved mean circulation. As before, OMCT forcing fields consist of wind stress, surface pressure, 2m-temperatures and freshwater fluxes obtained from ECMWF's numerical weather prediction and re-analysis models.
Here, variability of an OMCT simulation forced by 6-hourly ECMWF operational analyses that form the basis of the new GRACE AOD product RL05 will be evaluated against data from in-situ ocean bottom pressure and satellite altimetry in order to demonstrate recently achieved improvements with respect to the previously available data series from OMCT. |
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