JAPANESE JOURNAL OF BIOMETEOROLOGY
Online ISSN : 1347-7617
Print ISSN : 0389-1313
ISSN-L : 0389-1313
Original Articles
Effects of large green park on urban atmospheric cooling during nighttime
—Meteorological observations around the Osaka Castle Park—
Yoshinori Shigeta, Toshiyuki Takaoka, Yukitaka Ohashi, Yukihiro Kikegawa, Yujiro Hirano
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Keywords: urban climate, cool island, green park, sky view factor, green coverage, nocturnal cooling
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2013 Volume 50 Issue 1 Pages 23-35

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Abstract
The cool-island phenomena were observed at Osaka Castle Park on August 1-15, 2007. The surface-air temperature inside the park was nocturnally lower than that around urban areas. The cool-island intensity was more than +2.0°C during 4–5 JST. The cooler air generated inside the park extended downwind at the distance of about 250 m. Next, we compared the atmospheric cooling amounts on the forest area with that on the lawn area. As a result, it was suggested that the cooler air over the forest canopy subsided into and accumulated on the ground surface.
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© 2013 JAPANESE SOCIETY OF BIOMETEOROLOGY
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