| Autor: |
Ludwig, F. L., Dabberdt, W. F. |
| Zdroj: |
International Journal of Biometeorology; March 1973, Vol. 17 Issue: 1 p1-11, 11p |
| Abstrakt: |
Analysis of wind direction fluctuation-data indicates that turbulent diffusion in urban areas is significantly larger than in the country; urban diffusion occurs at a rate characteristic of less stable rural conditions. Differences between urban and rural dispersion are approximately equivalent to changes of one Pasquill stability class. Nighttime urban mixing depths are greater than the corresponding rural values because of the heat island effect. Empirical relationships and Summers' simple model of the heat island are used to derive an expression for the urban mixing depth in terms of city population and rural lapse rate. The expression was found to be in reasonably good agreement with lidar observations of mixing depth in St. Louis. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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