Journal of the Korean earth science society (한국지구과학회지)

The Korean Earth Science Society (한국지구과학회)
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Analysis of a Sea Fog Using Ocean-air Observation Data in the Mid-Yellow Sea off Korea

해양기상 관측자료를 이용한 서해 중부해역 해무 분석

  • Oh, Hee-Jin (Marine Meteorology and Earthquake Research Laboratory, Meteorological Research Institute) ;
  • Lee, Ho-Man (Marine Meteorology and Earthquake Research Laboratory, Meteorological Research Institute) ;
  • Seo, Tae-Gun (Marine Meteorology and Earthquake Research Laboratory, Meteorological Research Institute) ;
  • Youn, Yong-Hoon (Marine Meteorology and Earthquake Research Laboratory, Meteorological Research Institute) ;
  • Kim, Tae-Hee (Marine Meteorology and Earthquake Research Laboratory, Meteorological Research Institute)
  • 오희진 (기상연구소 해양기상지진연구실) ;
  • 이호만 (기상연구소 해양기상지진연구실) ;
  • 서태건 (기상연구소 해양기상지진연구실) ;
  • 윤용훈 (기상연구소 해양기상지진연구실) ;
  • 김태희 (기상연구소 해양기상지진연구실)
  • Published : 2003.06.30
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Abstract

Ocean-air observation using an Automatic Weather Station (AWS) and Conductivity Temperature Depth (CTD) was conducted in the Mid-Yellow Sea off Korea during 8-10 July 2002. A water mass lower than 17$^{\circ}C$ around the Taean peninsula and a tidal front between 36$^{\circ}$20'N and 36$^{\circ}$30'N were observed. The horizontal distribution of air temperature was similar to that of sea surface temperature (SST). Hourly observation around Dukjuk island showed the cold and saline southwesterly and the warm and fresh northeasterly in phase with tidal current. Sea fogs two times formed at 2300 LST 8-0130 LST 9, and 0300-0600 LST 9 July 2002 during the observation period, respectively. During the initial stage of fogs, winds became northeasterly at the speed of 2-4m/s$^{-1}$, and air temperature dropped to 18$^{\circ}C$, as the North Pacific High weakened. The satellite image indicated that sea fogs formed over warm water in the western Yellow Sea and moved eastward toward the observation site, which could be called a steam fog. The fogs dissipated when wind speed and air temperature increased.

2002년 7월 8일에서 10일까지 AWS와 CTD를 이용하여 서해 중부 연안역에서 해양기상관측을 실시하였다. 수심이 낮은 태안반도 연안역에서 17$^{\circ}C$ 이하의 냉수가 출현하였고, 36$^{\circ}$20'N와 36$^{\circ}$30'N 사이에 정선을 따라 조석전선이 형성되었다. 기온의 분포는 수온의 분포양상과 유사하게 나타났다. 덕적도 주변(Al)에서 24시간 연속관측결과, 조류와 같은 주기로 북동부로부터 고온저염수와 남서부로부터 저온고염수의 이동이 관측되었다. 관측기간 중에 7월 8일 23시에서 9일 1시 30분까지, 9일 3시에서 5시까지 해무가 발생하였다. 해무발생 시 북태평양 고기압이 약해지면서 기온은 18$^{\circ}C$까지 하강하였고, 바람은 2-4m/s의 북동풍이 불었다. 위성사진을 분석하였을 때, 이 안개는 표층수온이 높은 황해서부를 중심으로 발생하여 시간이 지나면서 관측해역으로 확장된 증기안개이다. 이 해무는 기온과 풍속이 상승하면서 소멸되었다.

Keywords

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