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Titolo:
PARAMETRICALLY FORCED ENVELOPE ROSSBY SOLITONS - SOLITON-OSCILLATION
Autore:
LUO D;
Indirizzi:
CHENGDU INST METEOROL CHENGDU 610041 PEOPLES R CHINA
Titolo Testata:
Geophysical and astrophysical fluid dynamics
fascicolo: 1-2, volume: 85, anno: 1997,
pagine: 1 - 29
SICI:
0309-1929(1997)85:1-2<1:PFERS->2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
ATMOSPHERIC BLOCKING; FARADAY RESONANCE; WAVES; EQUILIBRIA;
Keywords:
NONLINEAR SCHRODINGER EQUATION; ENVELOPE ROSSBY SOLITON; LIMIT CYCLE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
21
Recensione:
Indirizzi per estratti:
Citazione:
D. Luo, "PARAMETRICALLY FORCED ENVELOPE ROSSBY SOLITONS - SOLITON-OSCILLATION", Geophysical and astrophysical fluid dynamics, 85(1-2), 1997, pp. 1-29

Abstract

In this paper, the non-dimensional equivalent barotropic vorticity equation with dissipation and an external vorticity source induced by diabatic heating was reduced to the generalized periodically forced nonlinear Schrodinger (NLS) equation similar to the parametrically excitedNLS equation derived by Miles (1984) by means of the multiple-scale method. This forced NLS equation can be reduced to a low-dimensional ordinary differential equation describing the amplitude and phase of theforced envelope Rossby soliton by the inverse-scattering perturbationmethod. The numerical calculations indicate that for weaker dissipation the envelope Rossby soliton, under a constant amplitude travelling diabatic heating, exhibits multi-periodic oscillations, and its phase portrait is found to be a limit cycle. However, for the forcing of one-year modulated diabatic heating, the forced envelope Rossby soliton can execute chaotic motion when the controlling parameter reaches a certain extent. In addition, the oscillatory behaviour of the forced envelope Rossby soliton is found to be able to explain the establishment and decay of vortex pair blocking usually observed in two oceans.

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Documento generato il 01/10/20 alle ore 05:36:08