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| Titel |
Model of oscillatory instability in vertically-homogeneous atmosphere |
| VerfasserIn |
P. B. Rutkevich, P. P. Rutkevych |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: Topics in modern geophysical fluid dynamics ; Nr. 15 (2009-02-23), S.57-63 |
| Datensatznummer |
250012547
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| Publikation (Nr.) |
 copernicus.org/adgeo-15-57-2009.pdf |
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| Zusammenfassung |
| Existence and repeatability of tornadoes could be straightforwardly explained
if there existed instability, responsible for their formation.
However, it is well known that convection is the only instability in initially
stable air, and the usual convective instability is not applicable for these phenomena.
In the present paper we describe an instability in the atmosphere, which can be
responsible for intense vortices.
This instability appears in a fluid with Coriolis force and dissipation and has
oscillatory behaviour, where the
amplitude growth is accompanied by oscillations with frequency comparable to
the growth rate of the instability.
In the paper, both analytical analysis of the linear phase of the instability
and nonlinear simulation of the developed stage of the air motion are
addressed.
This work was supported by the RFBR grant no. 09-05-00374-a. |
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