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| Titel |
An eddy resolving tidal-driven model of the South China Sea assimilating along-track SLA data using the EnOI |
| VerfasserIn |
J. Xie, F. Counillon, J. Zhu, L. Bertino |
| 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. 5 ; Nr. 7, no. 5 (2011-10-06), S.609-627 |
| Datensatznummer |
250004802
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| Publikation (Nr.) |
 copernicus.org/os-7-609-2011.pdf |
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| Zusammenfassung |
| The upper ocean circulation in the South China Sea (SCS) is driven by the
Asian monsoon, the Kuroshio intrusion through the Luzon Strait, strong tidal
currents, and a complex topography. Here, we demonstrate the benefit of
assimilating along-track altimeter data into a nested configuration of the
HYbrid Coordinate Ocean Model that includes tides. Including tides in models
is important because they interact with the main circulation. However,
assimilation of altimetry data into a model including tides is challenging
because tides and mesoscale features contribute to the elevation of ocean
surface at different time scales and require different corrections. To
address this issue, tides are filtered out of the model output and only the
mesoscale variability is corrected with a computationally cheap data
assimilation method: the Ensemble Optimal Interpolation (EnOI). This method
uses a running selection of members to handle the seasonal variability and
assimilates the track data asynchronously. The data assimilative system is
tested for the period 1994–1995, during which time a large number of
validation data are available. Data assimilation reduces the Root Mean
Square Error of Sea Level Anomalies from 9.3 to 6.9 cm and improves the
representation of the mesoscale features. With respect to the vertical
temperature profiles, the data assimilation scheme reduces the errors
quantitatively with an improvement at intermediate depth and deterioration at
deeper depth. The comparison to surface drifters shows an improvement of
surface current by approximately −9% in the Northern SCS and east of
Vietnam. Results are improved compared to an assimilative system that does
not include tides and a system that does not consider asynchronous
assimilation. |
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