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| Titel |
Nonlinear instability of baroclinic atmosphere with reference to planetary scale disturbances |
| VerfasserIn |
I. A. Pisnichenko |
| 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 ; 11, no. 3 ; Nr. 11, no. 3 (2004-08-02), S.363-370 |
| Datensatznummer |
250009241
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| Publikation (Nr.) |
 copernicus.org/npg-11-363-2004.pdf |
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| Zusammenfassung |
| In this paper we investigate the stability of zonal flow in a baroclinic
atmosphere with respect to finite-amplitude planetary-scale disturbances by
applying Arnold's method. Specifically, we examine the sign of the second
variation of a conserved functional for the case of a polytropic atmosphere
(i.e. one with a linear lapse rate) and with a linear profile of zonal wind.
Sufficient stability conditions for an infinite atmosphere (i.e. with a temperature
lapse rate equal to zero) are satisfied only for an atmosphere in solid body rotation.
For a polytropic atmosphere of finite extent (a lapse rate is not equal zero)
the sufficient conditions of stability can be satisfied if a lid is placed below min (Zmax, polytropic atmospheric height). The dependence of height
Zmax on values of the vertical gradient of the zonal wind and the zonal temperature
distribution is calculated. |
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