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| Titel |
Constraining energetic slope currents through assimilation of high-frequency radar observations |
| VerfasserIn |
A. K. Sperrevik, K. H. Christensen, J. Röhrs |
| 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 ; 11, no. 2 ; Nr. 11, no. 2 (2015-03-11), S.237-249 |
| Datensatznummer |
250117174
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| Publikation (Nr.) |
 copernicus.org/os-11-237-2015.pdf |
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| Zusammenfassung |
| Assimilation of high-frequency (HF) radar current observations and CTD
hydrography is performed with the 4D-Var analysis scheme implemented in the
Regional Ocean Modeling System (ROMS). We consider both an idealized case,
with a baroclinic slope current in a periodic channel, and a realistic case
for the coast of Vesterålen in northern Norway. In the realistic case,
the results of the data assimilation are compared with independent data from
acoustic profilers and surface drifters. Best results are obtained when
background error correlation scales are small (10 km or less) and when the
data assimilation window is short, i.e. about 1 day. Furthermore, we find
that the impact of assimilating HF radar currents is generally larger than
the impact of CTD hydrography. However, combining the HF radar currents with
a few hydrographic profiles gives significantly better results, which
demonstrates the importance of complementing surface observations with
observations of the vertical structure of the ocean. |
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