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| Titel |
Characteristics of gravity waves resolved by ECMWF |
| VerfasserIn |
P. Preusse, M. Ern, P. Bechtold, S. D. Eckermann, S. Kalisch, Q. T. Trinh, M. Riese |
| 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 ; 14, no. 19 ; Nr. 14, no. 19 (2014-10-02), S.10483-10508 |
| Datensatznummer |
250119079
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| Publikation (Nr.) |
 copernicus.org/acp-14-10483-2014.pdf |
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| Zusammenfassung |
| Global model data from the European Centre for Medium-Range Weather Forecasts
(ECMWF) are analyzed for resolved gravity waves (GWs). Based on fitted
3-D
wave vectors of individual waves and using the ECMWF global scale background
fields, backward ray tracing from 25 km altitude is performed. Different
sources such as orography, convection and winter storms are identified. It is
found that due to oblique propagation waves spread widely from narrow source
regions. Gravity waves which originate from regions of strong convection are
frequently excited around the tropopause and have in the ECMWF model low
phase and group velocities as well as very long horizontal wavelengths
compared to other models and to measurements. While the total amount of
momentum flux for convective GWs changes little over season, GWs generated by
storms and mountain waves show large day-to-day variability, which has
a strong influence also on total hemispheric fluxes; from one day to the next
the total hemispheric flux may increase by a factor of 3. Implications of
these results for using the ECMWF model in predicting, analyzing and
interpreting global GW distributions as well as implications for seamless
climate prediction are discussed. |
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