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| Titel |
Numerical and the MU radar estimations of gravity wave enhancement and turbulent ozone fluxes near the tropopause |
| VerfasserIn |
N. M. Gavrilov, S. Fukao |
| 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 ; 22, no. 11 ; Nr. 22, no. 11 (2004-11-29), S.3889-3898 |
| Datensatznummer |
250015057
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| Publikation (Nr.) |
 copernicus.org/angeo-22-3889-2004.pdf |
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| Zusammenfassung |
| It is shown with a numerical simulation that a sharp increase in the vertical
temperature gradient and Brunt-Väisälä frequency near the
tropopause may produce an increase in the amplitudes of internal gravity
waves (IGWs) propagating upward from the troposphere, wave breaking and
generation of stronger turbulence. This may enhance the transport of
admixtures between the troposphere and stratosphere in the middle latitudes.
Turbulent diffusion coefficient calculated numerically and measured with the
MU radar are of 1-10m2/s in different seasons in Shigaraki, Japan
(35° N, 136° E). These values lead to the estimation of vertical
ozone flux from the stratosphere to the troposphere of (1-10)x1014,
which may substantially add to the usually
supposed ozone downward transport with the general atmospheric circulation.
Therefore, local enhancements of IGW intensity and turbulence at
tropospheric altitudes over mountains due to their orographic excitation and
due to other wave sources may lead to the changes in tropospheric and total
ozone over different regions. |
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