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- W2019412540 abstract "In a valley sheltered from strong synoptic effects, the dynamics of the valley atmosphere at night is dominated by katabatic winds. In a stably stratified atmosphere, these winds undergo temporal oscillations, whose frequency is given by $$N sin {alpha }$$ for an infinitely long slope of constant slope angle $$alpha $$ , $$N$$ being the buoyancy frequency. Such an unsteady flow in a stably stratified atmosphere may also generate internal gravity waves (IGWs). The numerical study by Chemel et al. (Meteorol Atmos Phys 203:187–194, 2009) showed that, in the stable atmosphere of a deep valley, the oscillatory motions associated with the IGWs generated by katabatic winds are distinct from those of the katabatic winds. The IGW frequency was found to be independent of $$alpha $$ and about $$0.8N$$ . Their study did not consider the effects of the background stratification and valley geometry on these results. The present work extends this study by investigating those effects for a wide range of stratifications and slope angles, through numerical simulations for a deep valley. The two oscillatory systems are reproduced in the simulations. The frequency of the oscillations of the katabatic winds is found to be equal to $$N$$ times the sine of the maximum slope angle. Remarkably, the IGW frequency is found to also vary as $$C_mathrm{w}N$$ , with $$C_mathrm{w}$$ in the range $$0.7$$ – $$0.95$$ . These values for $$C_mathrm{w}$$ are similar to those reported for IGWs radiated by any turbulent field with no dominant frequency component. Results suggest that the IGW wavelength is controlled by the valley depth." @default.
- W2019412540 created "2016-06-24" @default.
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- W2019412540 date "2013-05-29" @default.
- W2019412540 modified "2023-10-18" @default.
- W2019412540 title "Characterization of Oscillatory Motions in the Stable Atmosphere of a Deep Valley" @default.
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- W2019412540 doi "https://doi.org/10.1007/s10546-013-9825-y" @default.
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