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| Titel |
The excitation of secondary gravity waves from body forces created by wave dissipation, and application to the Antartic winter |
| VerfasserIn |
Sharon Vadas, Erich Becker |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250141605
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| Publikation (Nr.) |
 EGU/EGU2017-5135.pdf |
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| Zusammenfassung |
| In this paper, we examine the spectrum of secondary gravity waves
(GWs) excited by localized and intermittent horizontal body forces
in the middle atmosphere. Such a body force is created, for
example, when primary GWs in a wave packet dissipate and deposit
their momentum into the fluid. We find that the excited secondary
GW spectrum is reasonably broad, which causes the vertical wind and
temperature perturbations to emphasize different wave scales at
higher altitudes. We then apply this theory to the results from
the KMCM and WACCM GW-resolving models in the wintertime Antartica.
We examine the GWs propagating through the middle to upper
mesosphere and relate some of them to the secondary GWs created at
lower altitudes via ray tracing. |
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