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| Titel |
ORCA12, a global ocean-ice model at 1/12∘ : successes, shortcomings and their impact on ocean forecasting |
| VerfasserIn |
Anne Marie Treguier, Bernard Barnier, Aurélie Albert, Julie Deshayes, Julien LeSommer, Camille Lique, Jean-Marc Molines, Thierry Penduff, Claude Talandier |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250153026
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| Publikation (Nr.) |
 EGU/EGU2017-17950.pdf |
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| Zusammenfassung |
| Mercator-Ocean currently uses ORCA12, a global 1/12∘ model based on the NEMO
modelling platform, which is a the core of CMEMS. The ORCA12 model has also been used
by the DRAKKAR group to perform multi-decadal simulations forced by the atmosphere,
without data assimilation. In these forced ocean-ice experiments, the benefit of the 1/12∘
resolution appears clearly, for the representation of fronts and mesoscale eddies. However, the
pathways of energetic currents are not yet robust at 1/12∘: the North Atlantic current is an
exemple, as is the Agulhas retroflexion. The time-mean currents in ORCA12 are found to be
sensitive to parameterizations, numerical schemes, and atmospheric forcing. These
sensitivities are not unexpected, considering the highly nonlinear dynamics of eddy-induced
mean recirculations and flow-topography interactions. We attempt to quantify the influence of
biases in the position of energetic currents on the error growth during a forecast. |
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