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| Titel |
Impact of combining GRACE and GOCE gravity data on ocean circulation estimates |
| VerfasserIn |
T. Janjić, J. Schröter, R. Savcenko, W. Bosch, A. Albertella, R. Rummel, O. Klatt |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 8, no. 1 ; Nr. 8, no. 1 (2012-02-08), S.65-79 |
| Datensatznummer |
250005397
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| Publikation (Nr.) |
 copernicus.org/os-8-65-2012.pdf |
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| Zusammenfassung |
| With the focus on the Southern Ocean circulation, results of assimilation of
multi-mission-altimeter data and the GRACE/GOCE gravity data into the finite
element ocean model (FEOM) are investigated. We use the geodetic method to
obtain the dynamical ocean topography (DOT). This method combines the
multi-mission-altimeter sea surface height and the GRACE/GOCE gravity field.
Using the profile approach, the spectral consistency of both fields is
achieved by filtering the sea surface height and the geoid. By combining the
GRACE and GOCE data, a considerably shorter filter length can be used, which
results in more DOT details. We show that this increase in resolution of
measured DOT carries onto the results of data assimilation for the surface
data. By assimilating only absolute dynamical topography data using the
ensemble Kalman filter, we were able to improve modeled fields. Results are
closer to observations which were not used for assimilation and lie outside
the area covered by altimetry in the Southern Ocean (e.g. temperature of
surface drifters or deep temperatures in the Weddell Sea area at 800 m depth
derived from Argo composite.) |
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