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| Titel |
An ocean modelling and assimilation guide to using GOCE geoid products |
| VerfasserIn |
K. Haines, J. A. Johannessen, P. Knudsen, D. Lea, M.-H. Rio, L. Bertino, F. Davidson, F. Hernandez |
| 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 ; 7, no. 1 ; Nr. 7, no. 1 (2011-02-23), S.151-164 |
| Datensatznummer |
250004439
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| Publikation (Nr.) |
 copernicus.org/os-7-151-2011.pdf |
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| Zusammenfassung |
We review the procedures and challenges that must be considered when using
geoid data derived from the Gravity and steady-state Ocean Circulation
Explorer (GOCE) mission in order to constrain the circulation and water mass
representation in an ocean general circulation model. It covers the
combination of the geoid information with time-mean sea level information
derived from satellite altimeter data, to construct a mean dynamic
topography (MDT), and considers how this complements the time-varying sea
level anomaly, also available from the satellite altimeter. We particularly
consider the compatibility of these different fields in their spatial scale
content, their temporal representation, and in their error covariances.
These considerations are very important when the resulting data are to be
used to estimate ocean circulation and its corresponding errors.
We describe the further steps needed for assimilating the resulting dynamic
topography information into an ocean circulation model using three different
operational forecasting and data assimilation systems. We look at methods
used for assimilating altimeter anomaly data in the absence of a suitable
geoid, and then discuss different approaches which have been tried for
assimilating the additional geoid information. We review the problems that
have been encountered and the lessons learned in order the help future
users. Finally we present some results from the use of GRACE geoid
information in the operational oceanography community and discuss the future
potential gains that may be obtained from a new GOCE geoid. |
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