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| Titel |
Low-order models of wave interactions in the transition to baroclinic chaos |
| VerfasserIn |
W.-G. Früh |
| 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 ; 3, no. 3 ; Nr. 3, no. 3, S.150-165 |
| Datensatznummer |
250001020
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| Publikation (Nr.) |
 copernicus.org/npg-3-150-1996.pdf |
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| Zusammenfassung |
| A hierarchy of low-order models,
based on the quasi-geostrophic two-layer model, is used to
investigate
complex multi-mode flows. The different models were
used to
study distinct types of nonlinear interactions, namely
wave-
wave interactions through resonant triads, and zonal
flow-wave
interactions. The coupling strength of individual
triads is
estimated using a phase locking probability density
function.
The flow of primary interest is a strongly modulated
amplitude
vacillation, whose modulation is coupled to
intermittent
bursts of weaker wave modes. This flow was found to
emerge in
a discontinuous bifurcation directly from a
steady wave
solution. Two mechanism were found to result in
this flow,
one involving resonant triads, and the other involving
zonal
flow-wave interactions together with a strong β-effect.
The results will be compared with recent
laboratory experiments of multi-mode baroclinic waves in a rotating
annulus
of fluid subjected to a horizontal temperature gradient. |
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