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| Titel |
Nonlinear interaction of gravity waves in a nonisothermal and dissipative atmosphere |
| VerfasserIn |
K. M. Huang, S. D. Zhang, F. Yi, C. M. Huang, Q. Gan, Y. Gong, Y. H. Zhang |
| 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 ; 32, no. 3 ; Nr. 32, no. 3 (2014-03-21), S.263-275 |
| Datensatznummer |
250121039
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| Publikation (Nr.) |
 copernicus.org/angeo-32-263-2014.pdf |
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| Zusammenfassung |
| Starting from a set of fully nonlinear equations, this
paper studies that two initial gravity wave packets interact to produce a
third substantial packet in a nonisothermal and dissipative atmosphere. The
effects of the inhomogeneous temperature and dissipation on interaction are
revealed. Numerical experiments indicate that significant energy exchange
occurs through the nonlinear interaction in a nonisothermal and dissipative
atmosphere. Because of the variability of wavelengths and frequencies of
interacting waves, the interaction in an inhomogeneous temperature field is
characterised by the nonresonance. The nonresonant three waves mismatch
mainly in the vertical wavelengths, but match in the horizontal wavelengths,
and their frequencies also tend to match throughout the interaction. Below
80 km, the influence of atmospheric dissipation on the interaction is rather
weak due to small diffusivities. With the further propagation of wave above
80 km, the exponentially increasing atmospheric dissipation leads to the
remarkable decay and slowly upward propagation of wave energy. Even so, the
dissipation below 110 km is not enough to decrease the vertical wavelength
of wave. The dissipation seems neither to prevent the interaction occurrence
nor to prolong the period of wave energy exchange, which is different from
the theoretical prediction based on the linearised equations. The match
relationship and wave energy evolution in numerical experiments are helpful
in further investigating interaction of gravity waves in the middle
atmosphere based on experimental observations. |
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