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| Titel |
On the nonlinear shaping mechanism for gravity wave spectrum in the atmosphere |
| VerfasserIn |
I. P. Chunchuzov |
| 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 ; 27, no. 11 ; Nr. 27, no. 11 (2009-11-02), S.4105-4124 |
| Datensatznummer |
250016696
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| Publikation (Nr.) |
 copernicus.org/angeo-27-4105-2009.pdf |
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| Zusammenfassung |
| The nonlinear mechanism of shaping of a high vertical wave number spectral
tail in the field of a few discrete internal gravity waves in the atmosphere
is studied in this paper. The effects of advection of fluid parcels by
interacting gravity waves are taken strictly into account by calculating
wave field in Lagrangian variables, and performing a variable transformation
from Lagrangian to Eulerian frame. The vertical profiles and vertical wave
number spectra of the Eulerian displacement field are obtained for both the
case of resonant and non-resonant wave-wave interactions. The evolution of
these spectra with growing parameter of nonlinearity of the internal wave
field is studied and compared to that of a broad band spectrum of gravity
waves with randomly independent amplitudes and phases. The calculated
vertical wave number spectra of the vertical displacements or relative
temperature fluctuations are found to be consistent with the observed
spectra in the middle atmosphere. |
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