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| Titel |
Night-to-night changes in the characteristics of gravity waves at stratospheric and lower-mesospheric heights |
| VerfasserIn |
A. J. McDonald, L. Thomas, D. P. Wareing |
| 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 ; 16, no. 2 ; Nr. 16, no. 2, S.229-237 |
| Datensatznummer |
250013159
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| Publikation (Nr.) |
 copernicus.org/angeo-16-229-1998.pdf |
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| Zusammenfassung |
Observations made with the co-located
Rayleigh lidar and MST radar systems at Aberystwyth (52.4°N, 4.1°W) in Wales
and radiosondes from Valentia (51.9°N, 10.2°W) in Eire are used to investigate
the changes in the vertical propagation of gravity waves during periods of 4
days in June 1995 and February 1993. In each month, the lidar observations show
that the wave activity in the upper stratosphere and lower mesosphere changes
between two pairs of days. The radar and radiosonde measurements indicate that
mountain waves make no contribution to the changes in intensity. Instead, the
changes seem to arise largely from the presence or absence of long-period waves
with vertical wavelengths near 8 and 10 km in June and February, respectively.
The influence of such waves on the vertical wavenumber spectra is examined and
related to the evidence for convective instabilities provided by the temperature
profiles.
Key words. Rayleigh lidar · MST radar systems ·
Radiosondes · Gravity waves |
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