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| Titel |
A comparative study of winds and tidal variability in the mesosphere/lower-thermosphere region over Bulgaria and the UK |
| VerfasserIn |
D. Pancheva, P. Mukhtarov, N. J. Mitchell, A. G. Beard, H. G. Muller |
| 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 ; 18, no. 10 ; Nr. 18, no. 10, S.1304-1315 |
| Datensatznummer |
250014080
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| Publikation (Nr.) |
 copernicus.org/angeo-18-1304-2000.pdf |
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| Zusammenfassung |
Meteor radars located in Bulgaria and the UK
have been used to simultaneously measure winds in the
mesosphere/lower-thermosphere region near 42.5°N, 26.6°E and 54.5°N, 3.9°W,
respectively, over the period January 1991 to June 1992. The data have been used
to investigate planetary waves and diurnal and semidiurnal tidal variability
over the two sites. The tidal amplitudes at each site exhibit fluctuations as
large as 300% on time scales from a few days to the intra-seasonal, with most of
the variability being at intra-seasonal scales. Spectral and cross-wavelet
analysis reveals closely related tidal variability over the two sites,
indicating that the variability occurs on spatial scales large compared to the
spacing between the two radars. In some, but not all, cases, periodic
variability of tidal amplitudes is associated with simultaneously present
planetary waves of similar period, suggesting the variability is a consequence
of non-linear interaction. Calculation of the zonal wave number of a number of
large amplitude planetary waves suggests that during summer 1991 the 2-day wave
had a zonal wave number of 3, but that during January–February 1991 it had a
zonal wave number of 4.
Key words: Meteorology and atmospheric dynamics (middle
atmosphere dynamics; waves and tides) |
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