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| Titel |
Investigating of short period gravity waves using multi-beam experiments above Andenes in the polar summer mesopause |
| VerfasserIn |
Gunter Stober, Svenja Sommer, Jorge L. Chau, Ralph Latteck |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250088136
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| Publikation (Nr.) |
 EGU/EGU2014-2212.pdf |
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| Zusammenfassung |
| In summer 2013 the Middle Atmosphere Alomar Radar System (MAARSY) conducted a
multi-beam scanning experiment using 65 different beam directions. These systematic
scanning experiments are analysed with respect to gravity waves with periods from 4
minutes up to 8 hours using polar mesospheric summer echoes (PMSE) as tracer.
The gravity waves are investigated by decomposing the wind field into a mean
wind and superimposed tidal components (diurnal, semidiurnal and terdiurnal).
After subtracting these mean winds and tides we get a residuum wind dominated by
the gravity waves with periods shorter than 8 hours. Using this approach we have
been able to identified significant wave burst, with amplitudes as high as 50 m/s
and 10-20 m/s for the horizontal and vertical wind components, respectively. In
addition, we have identified events that indicate the development of KH-instabilities. |
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