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| Titel |
The nonlinear effects on the characteristics of gravity wave packets: dispersion and polarization relations |
| VerfasserIn |
S.-D. Zhang, F. Yi, J.-F. Wang |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 18, no. 10 ; Nr. 18, no. 10, S.1316-1324 |
| Datensatznummer |
250014081
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| Publikation (Nr.) |
 copernicus.org/angeo-18-1316-2000.pdf |
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| Zusammenfassung |
By analyzing the results of the numerical
simulations of nonlinear propagation of three Gaussian gravity-wave packets in
isothermal atmosphere individually, the nonlinear effects on the characteristics
of gravity waves are studied quantitatively. The analyses show that during the
nonlinear propagation of gravity wave packets the mean flows are accelerated and
the vertical wavelengths show clear reduction due to nonlinearity. On the other
hand, though nonlinear effects exist, the time variations of the frequencies of
gravity wave packets are close to those derived from the dispersion relation and
the amplitude and phase relations of wave-associated disturbance components are
consistent with the predictions of the polarization relation of gravity waves.
This indicates that the dispersion and polarization relations based on the
linear gravity wave theory can be applied extensively in the nonlinear region.
Key words: Meteorology and atmospheric dynamics (middle
atmosphere dynamics; waves and tides) |
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