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| Titel |
Generation of zonal flows by Rossby waves in the atmosphere |
| VerfasserIn |
O. G. Onishchenko, O. A. Pokhotelov, R. Z. Sagdeev, P. K. Shukla, L. Stenflo |
| 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. 2 ; Nr. 11, no. 2 (2004-04-14), S.241-244 |
| Datensatznummer |
250009136
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| Publikation (Nr.) |
 copernicus.org/npg-11-241-2004.pdf |
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| Zusammenfassung |
| A novel mechanism for the short-scale Rossby waves
interacting with long-scale zonal flows in the Earth's atmosphere is
studied. The model is based on the parametric excitation of convective cells
by finite amplitude Rossby waves. We use a set of coupled equations
describing the nonlinear interaction of Rossby waves and zonal flows which
admits the excitation of zonal flows. The generation of such flows is due to
the Reynolds stresses of the finite amplitude Rossby waves. It is found that
the wave vector of the fastest growing mode is perpendicular to that of the
pump Rossby wave. We calculate the maximum instability growth rate and
deduce the optimal spatial dimensions of the zonal flows as well as their
azimuthal propagation speed. A comparison with previous results is made. The
present theory can be used for the interpretation of existing observations
of Rossby type waves in the Earth's atmosphere. |
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