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| Titel |
A 24-variable low-order coupled ocean–atmosphere model: OA-QG-WS v2 |
| VerfasserIn |
S. Vannitsem, L. De Cruz |
| 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. 2 ; Nr. 7, no. 2 (2014-04-30), S.649-662 |
| Datensatznummer |
250115587
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| Publikation (Nr.) |
 copernicus.org/gmd-7-649-2014.pdf |
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| Zusammenfassung |
A new low-order coupled ocean–atmosphere model for midlatitudes is
derived. It is based on quasi-geostrophic equations for both the
ocean and the atmosphere, coupled through momentum transfer at the
interface. The systematic reduction of the number of modes
describing the dynamics leads to an atmospheric low-order component
of 20 ordinary differential equations, already discussed in
Reinhold and Pierrehumbert (1982), and an oceanic low-order component of four
ordinary differential equations, as proposed by
Pierini (2011). The coupling terms for both components are
derived and all the coefficients of the ocean model are provided.
Its dynamics is then briefly explored, through the analysis of its
mean field, its variability and its instability properties. The
wind-driven ocean displays a decadal variability induced by the
atmospheric chaotic wind forcing. The chaotic behavior of the
coupled system is highly sensitive to the ocean–atmosphere coupling
for low values of the thermal forcing affecting the atmosphere
(corresponding to a weakly chaotic coupled system). But it is less
sensitive for large values of the thermal forcing (corresponding to
a highly chaotic coupled system). In all the cases explored, the
number of positive exponents is increasing with the coupling.
Two codes in Fortran and Lua of the model integration are provided as
Supplement. |
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