Boundary-Layer Meteorology

, Volume 8, Issue 3–4, pp 261–280 | Cite as

A planetary boundary-layer study in the Mackenzie Valley, Canada

  • G. T. Csanady
  • B. Pade
Article

Abstract

Detailed wind velocity profiles were obtained by means of a rocket-sonde technique to a height of about 700 m at a site in the Canadian Northwest Territories. Less detailed temperature observations were also made using a balloon sonde. The site was some 100 km east of the easternmost range of the Rocky Mountains. The observations took place in mid-February when the overall atmospheric static stability was considerable.

The results showed the presence of an arctic, atmospheric ‘thermocline’ some 500 m above ground, which sloped up or down considerably, with the generators of isothermal surfaces usually parallel to the nearby mountains, in the manner of upwelled or downwelled thermoclines in the ocean near shore. There was often strong baroclinic flow parallel to the mountain range. Noticeable frictional effects were confined to a near-ground layer always less than 100 m and mostly no more than 10 m in height. An Ekman-type boundary layer could only be identified in about one-third of the velocity profiles. The non-dimensionalized depth coefficient of such layers was close to 0.1, the geostrophic drag coefficient about 2.5×10−4.

Keywords

Velocity Profile Drag Coefficient Mountain Range Rocky Mountain Temperature Observation 

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References

  1. Benson, C. S.: 1970, ‘Ice Fog’,Weather 25, 11–18.Google Scholar
  2. Burns, B. M.: 1973, ‘The Climate of the Mackenzie Valley — Beaufort Sea’, Climatological Studies No. 24, Atmospheric Environment Service, Toronto, 227 pp.Google Scholar
  3. Csanady, G. T.: 1972, ‘The Coastal Boundary Layer in Lake Ontario,J. Phys. Oceanogr. 2, 41–53 and 168–176.Google Scholar
  4. Csanady, G. T.: 1974, ‘Equilibrium Theory of the Planetary Boundary Layer with an Inversion Lid’,Boundary-Layer Meteorol. 6, 63–79.Google Scholar
  5. Csanady, G. T. and Pade, B.: 1974, ‘Planetary Boundary Layer Studies in the Mackenzie Valley’, WRI Report, Project 3066, Univ. of Waterloo, Ontario.Google Scholar
  6. Csanady, G. T. and Scott, J. T.: 1974, ‘Baroclinic Coastal Jets in Lake Ontario During IFYGL’,J. Phys. Oceanogr. 4, 524–541.Google Scholar
  7. Dalrymple, P. C., Lettau, H. H. and Wollaston, S. H.: 1966, ‘South Pole Micrometeorology Program: Data Analysis’, in M. J. Rubin (ed.),Studies in Antarctic Meteorology, pp. 13–57, American Geophysical Union.Google Scholar
  8. Lettau, H. H.: 1967, ‘Small to Large-Scale Features of Boundary Layer Structure over Mountain Slopes’, Proc. Symp. on Mountain Meteorology, Colorado State Univ., Colo., U.S.A.Google Scholar
  9. Schwerdtfeger, W.: 1971, ‘Remarkable Wind Shifts and Speeds a Few Meters Above the Surface of the Antarctic Plateau’,Antarctic J.U.S. 6, 218–219.Google Scholar
  10. Venkatesh, S. and Csanady, G. T.: 1974, ‘A Baroclinic Planetary Boundary Layer Model and its Application to the Wangara Data’,Boundary-Layer Meteorol. 5, 459–473.Google Scholar
  11. Woods, J. D.: 1968, ‘Wave Induced Shear Instability in the Summer Thermocline’,J. Fluid Mech. 32, 791–800.Google Scholar
  12. Yap, D.: 1974, ‘A Preliminary Investigation of Winter Air Pollution at Fort Simpson, Northwest Territories’,Atmosphere 12, 62–48.Google Scholar

Copyright information

© D. Reidel Publishing Company 1975

Authors and Affiliations

  • G. T. Csanady
    • 1
  • B. Pade
    • 1
  1. 1.Waterloo Research InstituteUniversity of WaterlooOntarioCanada

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