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| Titel |
Two-dimensional structure of mountain wave observed by aircraft during the PYREX experiment |
| VerfasserIn |
J. L. Attié, A. Druilhet, P. Durand, B. Bénech |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 15, no. 6 ; Nr. 15, no. 6, S.823-839 |
| Datensatznummer |
250012845
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| Publikation (Nr.) |
 copernicus.org/angeo-15-823-1997.pdf |
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| Zusammenfassung |
| This study presents an experimental analysis
from aircraft measurements above the Pyrenees chain during the PYREX experiment.
The Pyrenees chain, roughly WE oriented, is a major barrier for northerly and
southerly airflows. We present a case of southerly flow (15 October 1990) and
three successive cases of northerly flows above the Pyrenees (14, 15 and 16
November 1990) documented by two aircraft. The aircraft have described a
vertical cross section perpendicular to the Pyrenean ridge. This area is
described via the thermodynamical and dynamical fields which have a horizontal
resolution of 10 km. Three methods for computing the vertical velocity of the
air are presented. The horizontal advection terms which play a role in the
budget equations are also evaluated. The altitude turbulence zone of 15 October
are shown via turbulent fluxes, turbulent kinetic energy (TKE), dissipation rate
of TKE and inertial length-scale. A comparison of results obtained by
eddy-correlation and inertial-dissipation method is presented. The experimental
results show a warm and dry downdraft for the southerly flow with large values
for advection terms. All the mountain wave cases are also shown to present an
important dynamical perturbation just above the Pyrenees at upper altitudes. |
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