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| Titel |
Multiple equilibria and oscillatory modes in a mid-latitude ocean-forced atmospheric model |
| VerfasserIn |
B. Deremble, E. Simonnet, M. Ghil |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 19, no. 5 ; Nr. 19, no. 5 (2012-09-06), S.479-499 |
| Datensatznummer |
250014241
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| Publikation (Nr.) |
 copernicus.org/npg-19-479-2012.pdf |
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| Zusammenfassung |
Atmospheric response to a mid-latitude sea surface temperature (SST)
front is studied, while emphasizing low-frequency modes induced by
the presence of such a front. An idealized atmospheric
quasi-geostrophic (QG) model is forced by the SST field of an
idealized oceanic QG model. First, the equilibria of the oceanic
model and the associated SST fronts are computed. Next, these
equilibria are used to force the atmospheric model and compute its
equilibria when varying the strength of the oceanic forcing.
Low-frequency modes of atmospheric variability are identified and
associated with successive Hopf bifurcations. The origin of these
Hopf bifurcations is studied in detail, and connected to barotropic
instability. Finally, a link is established between the model's time
integrations and the previously obtained equilibria. |
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