Abstract
An analysis of 3 years' (1967–70) radiosonde wind data on the windward (Salt Lake City, Utah) and lee (Denver, Colorado) sides of mountains indicates that at these two stations: (1) the distributions of the kinetic energy of the mean and turbulent motions are similar above the mountain top; (2) below the mountain top, on the windward side, mountains tend to divert the component of the mean motion normal to the mountains to that parallel to the mountains; (3) the meridional eddy transport of westerly momentum is affected by the presence of the mountains to a higher level to the lee of the mountains than upwind of them; (4) the production of turbulent energy is higher below the mountain top in the vicinity of mountains than it is for the zonal average; (5) high frequencies of the motion show a more pronounced contribution in the meridional motion in the windward side, but in the zonal motion in the lee of the mountains; (6) disturbances of 1–2 day periods can be maintained deep into the valley, whereas disturbances of longer periods reduce their amplitudes rapidly with decreasing height from the mountain top; (7) the cospectra of the wind velocities show that the southward/northward transport of westerly momentum results from a southward/northward contribution from most frequencies. The main contributions come from eddies with periods longer than two days.
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References
Batchelor, G. K.: 1967,An Introduction to Fluid Dynamics, Cambridge University Press, 615 pp.
Bolin, B.: 1950, ‘On the Influence of the Earth's Orography on the Westerlies’Tellus 2, 184–195.
Charney, J. G. and Eliassen, A.: 1949, ‘A Numerical Method for Predicting the Perturbations of Middle Latitude Westerlies’Tellus 1, 38–55.
Chiu, W-. C.: 1960, ‘The Wind and Temperature Spectra of the Upper Troposphere and Lower Stratosphere over North America’J. Meteorol. 17, 64–77.
Crutcher, H. L.: 1961, Meridional Cross-Sections, Upper Winds over the Northern Hemisphere, United States Dept. of Commerce, Weather Bur., Tech. Paper No. 41.
Fultz, D. and Long, R. R.: 1951, ‘Two-Dimensional Flow Around a Circular Barrier in a Rotating spherical Shell,Tellus 3, 61–68.
Kao, S. K. and Hurley, W. P.: 1962, ‘Variations of the Kinetic Energy of Large-Scale Eddy Currents in Relation to the Jet Stream’J. Geophys. Res. 67, 2347–2359.
Kao, S. K. and Taylor, V. R.: 1964, ‘Mean Kinetic Energies of Eddy and Mean Currents in the Atmosphere’J. Geophys. Res. 69, 1037–1049.
Kasahara, A.: 1966, ‘The Dynamic Influence of Orography on the Large Scale Motion of the Atmosphere’J. Atmospheric Sci. 23, 259–271.
Kidson, J. W., Vincent, D. G., and Newell, R. E.: 1969, ‘Observational Studies of the General Circulation of the Tropics: Long Term Mean Values’Quart. J. Roy. Meteorol. Soc. 95, 258–287.
Lorenz, E. N.: 1967,The Nature and Theory of the General Circulation of the Atmosphere, World Meteorological Organization, 161 pp.
Queney, P.: 1948, ‘The Problems of Air Flow over Mountains: A Summary of Theoretical Studies’Bull. Amer. Meteorol. Soc. 29, 16–26.
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Kao, S.K., Paegle, J.N. & Normington, W.E. Mountain effect on the motion in the atmosphere's boundary layer. Boundary-Layer Meteorol 7, 501–512 (1974). https://doi.org/10.1007/BF00568339
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DOI: https://doi.org/10.1007/BF00568339