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100 1 _ |0 P:(DE-Juel1)VDB13497
|a Ern, M.
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245 _ _ |a Properties of the average distribution of equatorial Kelvin waves investigated with the GROGRAT ray tracer
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300 _ _ |a 7973 - 7995
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|a Atmospheric Chemistry and Physics
|v 9
|x 1680-7316
500 _ _ |a The work of M. Ern was supported by the European Commission (European Union's 6th framework program) within the EC Integrated Project SCOUT-O3 (505390-GOCE-CT-2004). The work of H.-K. Cho was supported by the Korea Science and Engineering Foundation (KOSEF) through the National Research Lab. Program funded by the Ministry of Science and Technology (M10500000114-06J0000-11410). We thank the whole SABER team, in particular M. G. Mlynczak, J. M. Russell III, and L. L. Gordley for providing the excellent data set of SABER temperatures. Thanks also go to the European Centre for Medium-Range Weather Forecasts (ECMWF) for providing the global ECMWF analyses used. Helpful comments by two anonymous reviewers are acknowledged.
520 _ _ |a 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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