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KMID : 1024520150240050657
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Journal of the Environmental Sciences
2015 Volume.24 No. 5 p.657 ~ p.670
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Atmospheric Characteristics of Fog Incidents at the Nakdong River : Case Study in Gangjeong-Goryeong Weir
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Park Jun-Sang
Lim Yun-Kyu
Kim Kyu-Rang
Jang Jun-Yeong
Kang Mi-sun
Kim Baek-Jo
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Abstract
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Visibility and Automatic Weather System(AWS) data near Nakdong river were analyzed to characterize fog formation during 2012-2013. The temperature was lower than its nearby city - Daegu, whereas the humidity was higher than the city. 157 fog events were observed in total during the 2 year period. About 65% of the events occurred in fall (September, October, and November) followed by winter, summer, and spring. 94 early morning fog events of longer than 30 minutes occurred when south westerly wind speed was lower than 2 m/s. During these events, the water temperature was highest followed by soil surface and air temperatures due to the advection of cold and humid air from nearby hill. The observed fog events were categorized using a fog-type classification algorithm, which used surface cooling, wind speed threshold, rate of change of air temperature and dew point temperature. As a result, frontal fog observed 6 times, radiation 4, advection 13, and evaporation 66. The evaporation fog in the study area lasted longer than other reports. It is due to the interactions of cold air drainage flow and warm surface in addition to the evaporation from the water surface. In particular, more than 60% of the evaporation fog events were accompanied with cold air flows over the wet and warm surface. Therefore, it is needed for the identification of the inland fog mechanism to evaluate the impacts of nearby topography and land cover as well as water body.
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KEYWORD
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Evaporation fog, Fog mechanism, Weir
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