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| Titel |
Solar cycle changes to planetary wave propagation and their influence on the middle atmosphere circulation |
| VerfasserIn |
N. F. Arnold, T. R. Robinson |
| 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. 1 ; Nr. 16, no. 1, S.69-76 |
| Datensatznummer |
250013103
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| Publikation (Nr.) |
 copernicus.org/angeo-16-69-1998.pdf |
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| Zusammenfassung |
Recent observations suggest that there may be
a causal relationship between solar activity and the strength of the winter
Northern Hemisphere circulation in the stratosphere. A three-dimensional model
of the atmosphere between 10–140 km was developed to assess the influence of
solar minimum and solar maximum conditions on the propagation of planetary waves
and the subsequent changes to the circulation of the stratosphere. Ultraviolet
heating in the middle atmosphere was kept constant in order to emphasise the
importance of non-linear dynamical coupling. A realistic thermosphere was
achieved by relaxing the upper layers to the MSIS-90 empirical temperature
model. In the summer hemisphere, strong radiative damping prevents significant
dynamical coupling from taking place. Within the dynamically controlled winter
hemisphere, small perturbations are reinforced over long periods of time,
resulting in systematic changes to the stratospheric circulation. The winter
vortex was significantly weakened during solar maximum and western phase of the
quasi-biennial oscillation, in accordance with reported 30 mb geopotential
height and total ozone measurements.
Key words. Meteorology and Atmospheric Dynamics
(Climatology; Middle atmosphere dynamics; waves and tides) |
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