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| Titel |
On the two-day oscillations and the day-to-day variability in global 3-D-modeling of the chemical system of the upper mesosphere/mesopause region |
| VerfasserIn |
G. R. Sonnemann, M. Grygalashvyly |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 12, no. 5 ; Nr. 12, no. 5 (2005-07-12), S.691-705 |
| Datensatznummer |
250010776
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| Publikation (Nr.) |
 copernicus.org/npg-12-691-2005.pdf |
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| Zusammenfassung |
| The integration of the photochemical system of the upper
mesosphere/mesopause region brought evidence that the system is able to
respond in a nonlinear manner under certain conditions. Under the action of
the diurnally-periodic insolation, the system creates subharmonic
oscillations or chaos if disregarding strong diffusion, and under special
conditions it possesses multiple solutions. The models used in the past were
simplified and idealized in view of the number of dimensions and the
consideration of the full dynamics. On the basis of our global 3-D-model of
the dynamics and chemistry of the middle atmosphere (COMMA-IAP), we also
found a nonlinear response in the photochemistry under realistic conditions.
The model under consideration is not yet self-consistent, but the chemical
model uses the dynamical fields calculated by the dynamic model. From our
calculations we got period-2 oscillations of the photochemical system within
confined latitudinal regions around the solstices but not during the
equinoxes. The consequence of the period-2 oscillation of the chemical
active minor constituents is that a marked two-day variation of the chemical
heating rates is an important thermal pumping mechanism. We discuss these
findings particularly in terms of the influence of realistic dynamics on the
creation of nonlinear effects. |
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