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Analysis of a Sea Fog Using Ocean-air Observation Data in the Mid-Yellow Sea off Korea  

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)
Publication Information
Journal of the Korean earth science society / v.24, no.4, 2003 , pp. 303-314 More about this Journal
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.
Keywords
Ocean-air observation; tidal front; Yellow sea cold water; steam fog;
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