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Characteristics of Water Temperature Inversion Observed in a Region West of Jeju Island in April 2015

2015년 4월에 제주 서부해역에서 발생한 수온역전층 특성

  • Kim, Seong Hyeon (Marine Security and Safety Research Center, Korea Institute of Ocean Science & Technology)
  • 김성현 (한국해양과학기술원 해양방위.안전연구센터)
  • Received : 2019.08.07
  • Accepted : 2020.04.07
  • Published : 2020.06.30

Abstract

In-situ observations were carried out in April 2015 to investigate the occurrence of water temperature inversion in a region west of Jeju Island. Analysis of in-situ in the western part of Jeju island showed that cold water moved to the southeast from the surface to the middle layer and warm water moved from the middle to the lower layer of the northwest direction. The water temperature inversion occurred at 84 stations (63.1%) out of 133 stations. At the boundary of the water temperature inversion layer, it was formed in the middle layer and disappeared. In the strongly appearing, it started from the middle layer to the lower layer. The shape of the water temperature inversion layer was different. As a result of horizontal water temperature slope analysis of the water temperature inversion zone, maximum 0.23℃/km was obtained and the mean was 0.06℃/km. The role of water temperature inversion as an indicator to determine the formation of water front. As a result of the water mass analysis, Jeju Warm Current Water and Tsushima Warm Current Water of high temperature and high salt intruded from the middle to the bottom. In the middle layer occurred as the Yellow Sea Cold Water of low water temperature and low salinity expanded.

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