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| Titel |
Modulation of O3 and CO in the UTLS induced by mountain waves during TREX |
| VerfasserIn |
M. Moustaoui, A. Mahalov, H. Teitelbaum, V. Grubišić |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250024602
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| Zusammenfassung |
| Ozone, CO and potential temperature obtained from aircraft measurements during the
Terrain-Induced Rotor Experiment (T-REX) in the UTLS region show fluctuations with
modulations in phases and amplitudes. The phase relation between ozone and potential
temperature varies in the horizontal along the trajectory of the aircraft. In some
legs of this trajectory, ozone and temperature are positively correlated while in
other legs the correlation is negative. The vertical profile of ozone exhibits
unusual decreases within a layer in the lower stratosphere, with positive gradients
above and below. It is demonstrated from observations as well as simulations that
the phase and amplitude modulations in ozone, CO and potential temperature are
produced by interactions of mountains waves with different wavenumbers. A wave with
a larger wavelength displaces the air column, causing horizontal variations in the
vertical gradients. The small waves evolving in these modulated gradients induce
wave-signatures in ozone and CO, with amplitudes and phase relationships that depend
on the vertical gradients encountered along the path of the aircraft. This
explanation is confirmed by reconstructed tracer variations deduced under this
dynamical hypothesis. |
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