The urban boundary layer in Montreal
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Abstract
Horizontal and vertical sampling of the atmosphere has provided new information on the form of Montreal's urban heat island. The horizontal pattern under clear skies with light winds shows a major heat island, with marked gradients at the periphery, and a multicellular inner core. Retarded urban cooling rates in the evening yield a maximum heat-island intensity around midnight. Combined horizontal and vertical temperature surveys show that under conditions of strong rural stability, the lowest layers of the urban atmosphere become progressively modified as air moves toward the centre of the city. The change in the form of the potential temperature profile is in good agreement with Summers' internal boundary-layer hypothesis. In Montreal differing heights of heat and SO2 emission appear to produce more than one internal layer. SO2 observations, and heat input calculations reveal two major emission sources in Montreal; one associated with an industrial complex, and the other with the downtown core.
Keywords
Urban Heat Island Inner Core Major Emission Urban Atmosphere Light WindPreview
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References
- Bornstein, R. D.: 1968, ‘Observations of the Urban Heat Island Effect in New York City’, J. Appl. Meteorol. 7, 575–582.Google Scholar
- Chandler, T. J.: 1965, The Climate of London, Hutchinson, 292 pp.Google Scholar
- Clarke, J. F.: 1969, ‘Nocturnal Urban Boundary Layer over Cincinnati Ohio’, Monthly Weather Rev. 97, 582–589.Google Scholar
- Daniels, P. A.: 1965, ‘The Urban Heat Island and Air Pollution, with Applications to Edmonton’, M.Sc. Thesis, Univ. of Alberta.Google Scholar
- Davidson, B.: 1967, ‘A Summary of the New York Urban Air Pollution Dynamics Research Program’, J. Air Pollution Control Assoc. 17, 154–158.Google Scholar
- Davis, F. K. and Newstein, H.: 1968, ‘The Meteorology and Vertical Distribution of Pollutants in Air Pollution Episodes in Philadelphia’, Atmos. Environ. 2, 559–574.Google Scholar
- DeMarrais, G. A.: 1961, ‘Vertical Temperature Differences Observed over an Urban Area’, Bull. Am. Meteorol. Soc. 8, 548–554.Google Scholar
- Duckworth, F. S. and Sandberg, J. S.: 1954, ‘The Effect of Cities upon Horizontal and Vertical Temperature Gradients’, Bull. Am. Meteorol. Soc. 35, 198–207.Google Scholar
- Georgii, H. W., Jost, D., and Shaeffer, H. J. : 1968, ‘Über die räumliche und zeitliche Verteilung von Schwefeldioxid und Sulfataerosolen in der unteren Troposhäre’, Scientific Report, Institute of Meteorology and Geophysics, Univ. of Frankfurt/Main, 55 pp.Google Scholar
- Leahey, D. M.: 1969, ‘An Urban Heat Island Model’, Final Report, Geophys. Sci. Lab TR-69-11, School of Engineering and Science, New York Univ., 70 pp.Google Scholar
- Ludwig, F. L. : 1970, ‘Urban Temperature Fields’, WMO Tech. Note No. 108, WMO No. 254 TP. 141, 80–107.Google Scholar
- Munn, R. E., Hirt, M. S., and Findlay, B. F.: 1969, ‘A Climatological Study of the Urban Temperature Anomaly in the Lakeshore Environment at Toronto’, J. Appl. Meteorol. 8, 411–422.Google Scholar
- Oke, T. R.: 1969, ‘Towards a More Rational Understanding of the Urban Heat Island’, Climat. Bull. 5, 1–20 (McGill University).Google Scholar
- Oke, T. R. and Hannell, F. G.: 1970, ‘The form of the Urban Heat Island in Hamilton, Canada’, WMO Tech. Note No. 108, WMO No. 254 TP. 141, 113–126.Google Scholar
- Powe, N. N. : 1969, ‘The Climate of Montreal’, Clim. Studies No. 15, Canada Department of Transport, Meteor. Branch, 51 pp.Google Scholar
- Summers, P. W.: 1964, An Urban Ventilation Model Applied to Montreal, Ph.D. Thesis, McGill Univ., Montreal.Google Scholar
- Yap, D., Gunn, K. L. S., and East, C.: 1969, ‘Vertical Temperature Distribution over Montreal’, Naturaliste Can. 96, 561–580.Google Scholar