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| Titel |
Ensemble Kalman filtering of Earth rotation observations with a global ocean model |
| VerfasserIn |
Jan Saynisch, Maik Thomas |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250048576
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| Zusammenfassung |
| The world oceans play a major part in the excitation of the Earth's
rotation anomalies. Especially, for polar motion atmospheric and
oceanic contributions are equally strong. Oceanic contributions to
length of day changes are smaller but still not negligible.
We study the oceanic excitations by Singular Evolutive Interpolated
Kalman-Filtering of ocean angular momentum which we derived from observed Earth
rotation anomalies. The assimilation is done with an ensemble of
global ocean circulation models.
We succeeded in the reproduction of the observation based oceanic
angular momentum and report on the methods sensitivity with respect to
error budgets and ensemble initialization strategies. Sufficient and
insufficient mechanisms of oceanic angular momentum generation are
discussed. |
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