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| Titel |
Properties of the average distribution of equatorial Kelvin waves investigated with the GROGRAT ray tracer |
| VerfasserIn |
M. Ern, H.-K. Cho, P. Preusse, S. D. Eckermann |
| 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. 20 ; Nr. 9, no. 20 (2009-10-23), S.7973-7995 |
| Datensatznummer |
250007704
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| Publikation (Nr.) |
 copernicus.org/acp-9-7973-2009.pdf |
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| Zusammenfassung |
| Kelvin waves excited by tropospheric convection are considered to be one of
the main drivers of the stratospheric quasi-biennial oscillation (QBO). In
this paper we combine several measured data sets with the Gravity wave
Regional Or Global RAy Tracer (GROGRAT) in order to study the forcing and
vertical propagation of Kelvin waves. Launch distributions for the ray tracer
at tropospheric altitudes are deduced from space-time spectra of European
Centre for Medium-Range Weather Forecasts (ECMWF) operational analyses, as
well as outgoing longwave radiation (OLR) and rainfall data measured by the
Tropical Rainfall Measuring Mission (TRMM) satellite. The resulting
stratospheric Kelvin wave spectra are compared to ECMWF operational analyses
and temperature measurements of the Sounding of the Atmosphere using
Broadband Emission Radiometry (SABER) satellite instrument. Questions
addressed are: the relative importance of source variability versus wind
modulation, the relative importance of radiative and turbulent damping versus
wave breaking, and the minimum altitude where freely propagating waves
dominate the spectrum. |
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