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| Titel |
Recent development of the Met Office operational ocean forecasting system: an overview and assessment of the new Global FOAM forecasts |
| VerfasserIn |
E. W. Blockley, M. J. Martin, A. J. McLaren, A. G. Ryan, J. Waters, D. J. Lea, I. Mirouze, K. A. Peterson, A. Sellar, D. Storkey |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 7, no. 6 ; Nr. 7, no. 6 (2014-11-10), S.2613-2638 |
| Datensatznummer |
250115774
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| Publikation (Nr.) |
 copernicus.org/gmd-7-2613-2014.pdf |
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| Zusammenfassung |
The Forecast Ocean Assimilation Model (FOAM) is an operational ocean analysis
and forecast system run daily at the Met Office. FOAM provides modelling
capability in both deep ocean and coastal shelf sea regimes using the NEMO
(Nucleus for European Modelling of the Ocean) ocean model as its dynamical
core. The FOAM Deep Ocean suite produces analyses and 7-day forecasts of
ocean tracers, currents and sea ice for the global ocean at 1/4°
resolution. Satellite and in situ observations of temperature, salinity, sea
level anomaly and sea ice concentration are assimilated by FOAM each day over
a 48 h observation window. The FOAM Deep Ocean configurations have recently
undergone a major upgrade which has involved the implementation of a new
variational, first guess at appropriate time (FGAT) 3D-Var, assimilation
scheme (NEMOVAR); coupling to a different, multi-thickness-category, sea ice
model (CICE); the use of coordinated ocean-ice reference experiment (CORE)
bulk formulae to specify the surface boundary condition; and an increased
vertical resolution for the global model.
In this paper the new FOAM Deep Ocean system is introduced and details of the
recent changes are provided. Results are presented from 2-year reanalysis
integrations of the Global FOAM configuration including an assessment of
short-range ocean forecast accuracy. Comparisons are made with both the
previous FOAM system and a non-assimilative FOAM system. Assessments reveal
considerable improvements in the new system to the near-surface ocean and sea
ice fields. However there is some degradation to sub-surface tracer fields
and in equatorial regions which highlights specific areas upon which to focus
future improvements. |
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