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| Titel |
Coupling phases and amplitudes of minor constituents with temperature perturbations in the lower thermosphere |
| VerfasserIn |
Y. W. Chen, F. L. Xiao |
| 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 ; 12, no. 5 ; Nr. 12, no. 5, S.438-447 |
| Datensatznummer |
250010791
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| Publikation (Nr.) |
 copernicus.org/angeo-12-438-1994.pdf |
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| Zusammenfassung |
| Based on the linearized theory of atmospheric
gravity waves (AGW) and considering the effects of temperature perturbation on
the chemical rate coefficients, the formulae of coupling relations between nj/nj
and T'/T driven by AGW (nj and T denote the background quantities)
are described, the coupling phases and amplitudes of minor constituents O3,
NO, H, OH, and O are analyzed in detail for the mesopause (86 km) and just
upside of the O layer (100 km) at daytime. A general principle is outlined: the
coupling phases are strongly dependent on density scale heights and perturbation
scales, while the amplitudes are little affected by these two factors. A
criterion to distinguish the coupling behaviour is given: when the minor
constituent number density scale height Hj satisfies 1-γHm/Hj>0
(Hm denotes the scale height of the major constituent), the dynamical
perturbation process always keeps the nj/nj in phase with T'/T, i.e.
keeps the nj/nj in antiphase with that of the major constituent. The
results obtained indicate that both the temperature dependence of reaction rate
coefficients and the profile slopes of the O distribution may have a major
influence on the behaviour of the coupling relations. |
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