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| Titel |
Observation and backward trajectory of an inertio-gravity wave in the lower stratosphere |
| VerfasserIn |
A. Hertzog, C. Souprayen, A. Hauchecorne |
| 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 ; 19, no. 9 ; Nr. 19, no. 9, S.1141-1155 |
| Datensatznummer |
250014323
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| Publikation (Nr.) |
 copernicus.org/angeo-19-1141-2001.pdf |
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| Zusammenfassung |
A Doppler lidar
observation of an inertio-gravity wave in the mid-latitude lower stratosphere
is presented. The wave packet characteristics (vertical and horizontal
wavenumbers, intrinsic and apparent frequencies) are inferred from the analysis
of the hodograph of the horizontal wind fluctuations. Those parameters are used
as initial conditions for the calculation of the wave packet trajectory
backwards in time in the atmosphere. These calculations are realized by
ray-tracing techniques, with background fields (wind and stability) provided by
the European Center for Medium-Range Weather Forecasting analyses. Sensitivity
tests are performed in order to estimate the robustness of the computed
trajectory. It is argued that the generation of the wave has taken place in the
upper troposphere, where evidence of large synoptic scale Rossby wave
disturbances are found. Our results support the fact that geostrophic
adjustment (and possibly shear instabilities) associated with such disturbances
could be an effective mechanism for the generation of inertia-gravity waves in
the mid-latitude.
Key words. Meteorology and
atmospheric dynamics, mesoscale meteorology, waves and tides, instruments and
techniques |
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