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| Titel |
Wave influence on polar mesosphere summer echoes above Wasa: experimental and model studies |
| VerfasserIn |
P. Dalin, S. Kirkwood  , M. Hervig, M. Mihalikova, D. Mikhaylova, I. Wolf, A. Osepian |
| 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 ; 30, no. 8 ; Nr. 30, no. 8 (2012-08-13), S.1143-1157 |
| Datensatznummer |
250017251
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| Publikation (Nr.) |
 copernicus.org/angeo-30-1143-2012.pdf |
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| Zusammenfassung |
| Comprehensive analysis of the wave activity in the Antarctic summer
mesopause is performed using polar mesospheric summer echoes (PMSE)
measurements for December 2010–January 2011. The 2-day planetary wave is
a statistically significant periodic oscillation in the power spectrum
density of PMSE power. The strongest periodic oscillation in the power
spectrum belongs to the diurnal solar tide; the semi-diurnal solar tide is
found to be a highly significant harmonic oscillation as well. The
inertial-gravity waves are extensively studied by means of PMSE power and
wind components. The strongest gravity waves are observed at periods of
about 1, 1.4, 2.5 and 4 h, with characteristic horizontal wavelengths of
28, 36, 157 and 252 km, respectively. The gravity waves propagate
approximately in the west-east direction over Wasa (Antarctica). A detailed
comparison between theoretical and experimental volume reflectivity of PMSE,
measured at Wasa, is made. It is demonstrated that a new expression for PMSE
reflectivity derived by Varney et al. (2011) is able to adequately describe
PMSE profiles both in the magnitude and in height variations. The best
agreement, within 30%, is achieved when mean values of neutral
atmospheric parameters are utilized. The largest contribution to the
formation and variability of the PMSE layer is explained by the ice number
density and its height gradient, followed by wave-induced perturbations in
buoyancy period and the turbulent energy dissipation rate. |
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