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| Titel |
Trends in MLT region winds and planetary waves, Collm (52° N, 15° E) |
| VerfasserIn |
Ch. Jacobi, P. Hoffmann, D. Kürschner |
| 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 ; 26, no. 5 ; Nr. 26, no. 5 (2008-05-28), S.1221-1232 |
| Datensatznummer |
250016097
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| Publikation (Nr.) |
 copernicus.org/angeo-26-1221-2008.pdf |
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| Zusammenfassung |
| Long-period oscillations in the period range 2–30 days, interpreted as
planetary wave (PW) signatures, have been analysed using daily
mesosphere/lower thermosphere wind measurements near 90 km over Collm (52° N,
15° E) in the time interval 1980–2005. Interannual and interdecadal
variability of PW are found. Since the 1990s, a tendency for larger zonal
amplitudes compared to meridional ones has been observed, i.e. some
long-term trends are visible, which are positive in the zonal component, but
negative in the meridional component. There is a tendency of the trend to be
non-linear for waves with periods lower than 7 days, so that a climatic
transition appears around 1990, with smaller changes before and after that
time. A solar cycle effect on PW is weak, but there is a tendency for a
positive correlation between solar flux and wave activity, if a time lag of
PW activity with respect to the solar flux of about 2 years is taken into
consideration. |
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