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| Titel |
Inertia gravity waves in the upper troposphere during the MaCWAVE winter campaign – Part II: Radar investigations and modelling studies |
| VerfasserIn |
A. Serafimovich, Ch. Zülicke, P. Hoffmann, D. Peters, P. Dalin, W. Singer |
| 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 ; 24, no. 11 ; Nr. 24, no. 11 (2006-11-21), S.2863-2875 |
| Datensatznummer |
250015671
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| Publikation (Nr.) |
 copernicus.org/angeo-24-2863-2006.pdf |
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| Zusammenfassung |
| We present an experimental and modelling study of a strong gravity
wave event in the upper troposphere/lower stratosphere near the
Scandinavian mountain ridge. Continuous VHF radar measurements
during the MaCWAVE rocket and ground-based measurement campaign
were performed at the Norwegian Andoya Rocket Range (ARR) near
Andenes (69.3° N, 16° E) in January
2003. Detailed gravity wave investigations based on PSU/NCAR
Fifth-Generation Mesoscale Model (MM5) data have been used for
comparison with experimentally obtained results. The model data
show the presence of a mountain wave and of an inertia gravity
wave generated by a jet streak near the tropopause region.
Temporal and spatial dependencies of jet induced inertia gravity
waves with dominant observed periods of about 13 h and
vertical wavelengths of ~4.5–5 km are investigated
with wavelet transform applied on radar measurements and model
data. The jet induced wave packet is observed to move upstream
and downward in the upper troposphere. The model data agree with
the experimentally obtained results fairly well. Possible reasons
for the observed differences, e.g. in the time of maximum of the
wave activity, are discussed. Finally, the vertical fluxes of
horizontal momentum are estimated with different methods
and provide similar amplitudes. We found indications that
the derived positive vertical flux of the horizontal momentum
corresponds to the obtained parameters of the jet-induced inertia
gravity wave, but only at the periods and heights of the strongest
wave activity. |
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