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| Titel |
"Scale oriented" embedded modeling of the North-Western Mediterranean in the frame of MFSTEP |
| VerfasserIn |
C. Estournel, F. Auclair, M. Lux, C. Nguyen, P. Marsaleix |
| 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 ; 5, no. 2 ; Nr. 5, no. 2 (2009-04-27), S.73-90 |
| Datensatznummer |
250002415
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| Publikation (Nr.) |
 copernicus.org/os-5-73-2009.pdf |
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| Zusammenfassung |
| An embedded forecasting system was developed for the North-Western
Mediterranean at 3-km resolution. The system is based on the Symphonie
hydrodynamic free surface model and on the variational initialization and
forcing platform VIFOP. The regional model is initialized and forced at its
open lateral boundaries by the MFS GCM and forced at the surface by the
ALADIN numerical weather prediction model. Once a week, a five-day forecast
is produced after a hindcast of seven days. This pre-modeling period of
7 days before beginning the forecast allows the development of the small
scale features associated to the high resolution. The relevance of the 5-day
forecast strategy has been examined by comparing the forecasted fields to
hindcast fields (forced by meteorological and oceanic analyses) considered as
a reference. Mismatches remain at a very low level indicating a good quality
of the forecasted forcing fields and also possibly to the strong wind
conditions which prevailed during the period. The embedded forecasts have
been compared to the MFS observing system (SST and MedArgo) during 6 forecast
cycles between September 2004 and February 2005. It was basically found that
in the North-Western Mediterranean, the MFS basin-scale model and thus the
regional model forecasts are characterized by large negative biases of
salinity in the first 100 m under the surface leading thus to too light
subsurface waters. The underestimation of temperature by the regional model
just below the surface and its overestimation at 30m deep can be attributed
to an overestimation of the turbulent mixing. The regional model allows to
represent a number of processes especially those induced by the wind as
coastal upwelling under stratified conditions, dense water formation over the
Gulf of Lion shelf, deep mixing in the convection zone or influence on the
Northern Current penetration in the Gulf of Lion. |
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