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KMID : 1024520160250030405
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Journal of the Environmental Sciences
2016 Volume.25 No. 3 p.405 ~ p.415
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Micro-meteorological Characteristics during the Steam Fog over the Gumi Reservoir of Nakdong River
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Kim Hae-Dong
Cho Chang-Bum
Seo Kwang-Soo
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Abstract
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We analyzed the micro-meteorological characteristics during typical steam fog over the Gumi Reservoir of Nakdong river with the field observation data for recent 2 year(1 April 2013~31 March 2015) collected by the national institute of meteorological research, KMA. Steam fog occur when the cold drainage flows over the warm water surface. As the sensible and latent heat from water are provided to the air, the instability of lower atmosphere is increased. The resultant vertical mixing of warm, moist air near water surface and cold air aloft causes the formation of status cloud. The convection strengthened by radiative cooling of the upper part of the stratus causes the fog to propagate downward. Also, the temperature at the lowest atmosphere is increased rapidly and the inversion near surface disappear by these processes when the fog forms. The increase of wind speed is observed because the downward transportation of momentum is caused by vertical mixing.
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KEYWORD
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Steam fog, Unstable atmosphere, Gumi reservoir, Vertical mixing process
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