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| Titel |
Gravity wave propagation in the realistic atmosphere based on a three-dimensional transfer function model |
| VerfasserIn |
L. Sun, W. Wan, F. Ding, T. Mao |
| 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 ; 25, no. 9 ; Nr. 25, no. 9 (2007-10-02), S.1979-1986 |
| Datensatznummer |
250015912
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| Publikation (Nr.) |
 copernicus.org/angeo-25-1979-2007.pdf |
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| Zusammenfassung |
| In order to study the filter effect of the background
winds on the propagation of gravity waves, a three-dimensional transfer
function model is developed on the basis of the complex dispersion relation
of internal gravity waves in a stratified dissipative atmosphere with
background winds. Our model has successfully represented the main results of
the ray tracing method, e.g. the trend of the gravity waves to travel in the
anti-windward direction. Furthermore, some interesting characteristics are
manifest as follows: (1) The method provides the distribution characteristic
of whole wave fields which propagate in the way of the distorted concentric
circles at the same altitude under the control of the winds. (2) Through
analyzing the frequency and wave number response curve of the transfer
function, we find that the gravity waves in a wave band of about 15–30 min
periods and of about 200–400 km horizontal wave lengths are most likely to
propagate to the 300-km ionospheric height. Furthermore, there is an obvious
frequency deviation for gravity waves propagating with winds in the
frequency domain. The maximum power of the transfer function with background
winds is smaller than that without background winds. (3) The atmospheric
winds may act as a directional filter that will permit gravity wave packets
propagating against the winds to reach the ionospheric height with minimum
energy loss. |
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