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| Titel |
Three-dimensional parameterizations of the synoptic scale kinetic energy and momentum flux in the Earth's atmosphere |
| VerfasserIn |
D. Coumou, V. Petoukhov, A. V. Eliseev |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 18, no. 6 ; Nr. 18, no. 6 (2011-11-16), S.807-827 |
| Datensatznummer |
250013995
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| Publikation (Nr.) |
 copernicus.org/npg-18-807-2011.pdf |
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| Zusammenfassung |
| We present a new set of statistical-dynamical equations (SDEs) which can
accurately reproduce the three-dimensional atmospheric fields of synoptic
scale kinetic energy and momentum flux. The set of equations is closed by
finding proper parameterizations for the vertical macro-turbulent diffusion
coefficient and ageostrophic terms. The equations have been implemented in a
new SD atmosphere model, named Aeolus. We show that the synoptic scale
kinetic energy and momentum fluxes generated by the model are in good
agreement with empirical data, which were derived from bandpass-filtered
ERA-40 data. In addition to present-day climate, the model is tested for
substantially colder (last glacial maximum) and warmer (2×CO2)
climates, and shown to be in agreement with general circulation model (GCM)
results. With the derived equations, one can efficiently study the position
and strength of storm tracks under different climate scenarios with
calculation time a fraction of those of GCMs. This work prepares ground for
the development of a new generation of fast Earth System Models of
Intermediate Complexity which are able to perform multi-millennia simulations
in a reasonable time frame while appropriately accounting for the climatic
effect of storm tracks. |
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