Nocturnal Airflow from Urban Parks-Implications for City Ventilation |
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| Authors: | I Eliasson H Upmanis |
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| Institution: | Laboratory of Climatology, Physical Geography, Department of Earth Sciences, G?teborg University, Sweden, SE
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| Abstract: | Summary The spatial and temporal pattern of nocturnal airflow in and around two urban parks in Scandinavia were analysed. The results,
based on 724 field measurements during 21 case studies, showed that both parks generated a local airflow during clear and
calm weather conditions. The spatial pattern was characterised by calm in the middle of the park and a steady airflow towards
the surrounding built-up areas at the park borders. The airflow from the park started one to two hours after sunset and continued
during a period of four to eight hours. The wind speed was low (< 0.5 ms−1) and the local air flow reached a short distance from the park border. In the flat park in K?benhavn, Denmark, the air flow
from the park was attributed solely to the development of a thermally induced park breeze. The park breeze development was
also predominant in the park in G?teborg, Sweden, but the influence of topography could not be totally excluded. The origin
of the airflow from the park and its importance for urban air quality were discussed.
Received April 15, 1999Revised December 2, 1999 |
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