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KMID : 1024520060150060527
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Journal of the Environmental Sciences
2006 Volume.15 No. 6 p.527 ~ p.532
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On the Seasonal Variation of Urban Heat Island Intensity According to Meteorological Condition in Daegu
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Ahn Ji-Suk
Kim Hae-Dong
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Abstract
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The purpose of this study is to clarify the characteristic of urban heat island intensity in urban area formed at a basin. Thermal environments for basin-type cities are influenced by significant topographic relief winds. In this study, we analyzed the diurnal variations of the heat island intensity according to meteorological condition and season using AWS(Automatic Weather observation System) data in Daegu Metropolitan area for 1 year(3/April, 2003 2/April, 2004). In this study, we defined the urban heat island intensity as the air temperature difference between two points, the downtown and the suburban area. The suburban area is located at valley mouth around the western tip of Daegu. The results are summarized as follows; 1. The maximum heat island intensity was recorded at early morning under the meteorological conditions, calm and clear 2. The heat island intensity was strong in the order of winter, fall, spring and summer. 3. The heat island intensity came out minus values in the afternoon. This phenomenon is known as a com mon for basin-type cities. 4. The heat island intensity was twice or more in clear and calm than not so.
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KEYWORD
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Heat island intensity, Urban climate, Valley mouth, Relief wind
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