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| Titel |
Contraction of westward-travelling nonlocal modons due to the vorticity filament emission |
| VerfasserIn |
D. Berson, Z. Kizner |
| 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 ; 9, no. 3/4 ; Nr. 9, no. 3/4, S.265-279 |
| Datensatznummer |
250006541
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| Publikation (Nr.) |
 copernicus.org/npg-9-265-2002.pdf |
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| Zusammenfassung |
| Long-term evolution
of westward-travelling non-local modons on the β-plane,
i.e. dipolar vortices imbedded in slowly damping Rossby wave fields, is
studied numerically. In the framework of the nondivergent (barotropic)
model, two stages of the evolution are observed. At the first stage (for
about 30 synoptic periods), the parameters and the form of the vortex
practically remain constant, whereas at the second stage, vorticity
filaments are emitted. Due to the filamentation, the vortex core
contracts, the potential vorticity peaks of the vortex pair get closer,
and the modon speeds up. In the divergent (equivalent-barotropic) model,
nonlocal modons and the Lamb modon (that has no wave field outside the
dipolar core) evolve much more slowly, essentially preserving the initial
shape and propagation speed until about 100 synoptic periods. |
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