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KMID : 1024520080170091053
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Journal of the Environmental Sciences
2008 Volume.17 No. 9 p.1053 ~ p.1068
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A Case Study on the Meteorological Observation in Spring for the Atmospheric Environment Impact Assessment at Sangin-dong Dalbi Valley, Daegu
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Park Jong-Kil
Jung Woo-Sik
Hwang Soo-Jin
Yoon Ill-Hee
Park Gil-Un
Kim Sin-Ho
Kim Seok-Cheol
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Abstract
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This study aims to produce fundamental database for Environment Impact Assessment by monitoring vertical structure of the atmosphere due to the mountain valley wind in spring season. For this, we observed surface and upper meteorological elements in Sangin-dong, Daegu using the rawinsonde and automatic weather system(AWS). In Sangin-dong, the weather condition was largely affected by mountains when compared to city center. The air temperature was low during the night time and day break, and similar to that of city center during the day time. Relative humidity also showed similar trend; high during the night time and day break and similar to that of city center during the day time. Solar radiation was higher than the city, and the daily maximum temperature was observed later than the city. The synoptic wind during the measurement period was west wind. But during the day time, the west wind was joined by the prevailing wind to become stronger than the night time. During the night time and daybreak, the impact of mountain wind lowered the overall temperature, showing strong geographical influence. The vertical structure of the atmosphere in Dalbi valley, Sangin-dong had a sharp change in air temperature, relative humidity, potential temperature and equivalent potential temperature when measured at the upper part of the mixing layer height. The mixing depth was formed at maximum 1896m above the ground, and in the night time, the inversion layer was formed by radiational cooling and cold mountain wind.
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KEYWORD
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Atmospheric environment impact assessment, Vertical meteorological observation, Rawinsonde, Mountain valley wind, Mixing depth
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