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| Titel |
The effect of the solar rotational irradiance variation on the middle and upper atmosphere calculated by a three-dimensional chemistry-climate model |
| VerfasserIn |
A. N. Gruzdev, H. Schmidt, G. P. Brasseur |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 9, no. 2 ; Nr. 9, no. 2 (2009-01-27), S.595-614 |
| Datensatznummer |
250006745
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| Publikation (Nr.) |
 copernicus.org/acp-9-595-2009.pdf |
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| Zusammenfassung |
| This paper analyzes the effects of the solar rotational (27-day) irradiance
variations on the chemical composition and temperature of the stratosphere,
mesosphere and lower thermosphere as simulated by the three-dimensional
chemistry-climate model HAMMONIA. Different methods are used to analyze the
model results, including high resolution spectral and cross-spectral
techniques. To force the simulations, an idealized irradiance variation with
a constant period of 27 days (apparent solar rotation period) and with
constant amplitude is used. While the calculated thermal and chemical
responses are very distinct and permanent in the upper atmosphere, the
responses in the stratosphere and mesosphere vary considerably in time
despite the constant forcing. The responses produced by the model exhibit a
non-linear behavior: in general, the response sensitivities (not amplitudes)
decrease with increasing amplitude of the forcing. In the extratropics the
responses are, in general, seasonally dependent with frequently stronger
sensitivities in winter than in summer. Amplitude and phase lag of the ozone
response in the tropical stratosphere and lower mesosphere are in
satisfactory agreement with available observations. The agreement between
the calculated and observed temperature response is generally worse than in
the case of ozone. |
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