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Micro-meteorological Characteristics during the Steam Fog over the Gumi Reservoir of Nakdong River

낙동강 구미 보의 증기 안개 발생 시의 미기상학적 특성

  • Received : 2015.11.09
  • Accepted : 2016.03.08
  • Published : 2016.03.31

Abstract

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.

Keywords

Steam fog;Unstable atmosphere;Gumi reservoir;Vertical mixing process

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Acknowledgement

Grant : 응용기상기술개발연구

Supported by : 국립기상연구소