An intra-urban thermal breeze in Göteborg, Sweden |
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| Authors: | S Thorsson I Eliasson |
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| Institution: | G?teborg University, Department of Earth Sciences, Physical Geography, G?teborg, Sweden, SE
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| Abstract: | Summary ?The existence and character of an intra-urban thermal breeze (IUTB) in the city centre of G?teborg, Sweden was examined.
The study was carried out in a 10 ha open area covered with gravel, asphalt and grass, surrounded by narrow street canyons.
Measurements included an array of fixed wind and temperature sensors and smoke in the open area; temperature of the surrounding
neighbourhood from mobile thermal mapping and fixed temperature sensors; standard climate measurements from four automatic
weather stations in and around G?teborg.
The results based on sixteen field surveys performed between December 1998 and March 2000 showed that the open urban area
might generate a special type of IUTB under certain conditions. The IUTB was shown to be a rare nocturnal winter phenomenon
developing during clear and calm weather conditions, with snow covered ground, strong ground based inversions and high stability
(Ri
b
> 1). The most important driving forces for the generation of an IUTB were large intra-urban horizontal air temperature differences
and strong atmospheric stability which led to decoupling of the canopy layer atmosphere from wind flow aloft.
In order to estimate the physical principles underlying an IUTB of this type a simple 1.5-dimensional model was devised. Results
indicated that the horizontal intra-urban air temperature difference recorded in G?teborg was enough to develop an IUTB.
Received May 6, 2002; revised November 20, 2002; accepted January 7, 2003
Published online May 20, 2003 |
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