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| Titel |
High-resolution large-eddy simulations of stably stratified flows: application to subkilometer-scale turbulence in the upper troposphere–lower stratosphere |
| VerfasserIn |
R. Paoli, O. Thouron, J. Escobar, J. Picot, D. Cariolle |
| 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. 10 ; Nr. 14, no. 10 (2014-05-22), S.5037-5055 |
| Datensatznummer |
250118730
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| Publikation (Nr.) |
 copernicus.org/acp-14-5037-2014.pdf |
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| Zusammenfassung |
| Large-eddy simulations of stably stratified flows are carried out and
analyzed using the mesoscale atmospheric model Méso-NH for applications to
kilometer- and subkilometer-scale turbulence in the in the upper
troposphere–lower stratosphere. Different levels of turbulence are generated using a
large-scale stochastic forcing technique that was especially devised to treat
atmospheric stratified flows. The study focuses on the analysis of turbulence
statistics, including mean quantities and energy spectra, as well as on a
detailed description of flow topology. The impact of resolution is also
discussed by decreasing the grid spacing to 2 m and increasing the number of
grid points to 8 × 109. Because of atmospheric stratification,
turbulence is substantially anisotropic, and large elongated structures form
in the horizontal directions, in accordance with theoretical analysis and
spectral, direct numerical simulations of stably stratified flows. It is also
found that the inertial range of horizontal kinetic energy spectrum,
generally observed at scales larger than a few kilometers, is prolonged into
the subkilometric range, down to the Ozmidov scales that obey isotropic
Kolmogorov turbulence. This study shows the capability of atmospheric models
like Méso-NH to represent the turbulence at subkilometer scales. |
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