Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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Characteristics of Ocean Environment in the Dry and Wet Seasons in the South Sea of Korea

한국 남해의 갈수기와 풍수기에 따른 해양 환경 특성

  • Choi, Yong-Kyu (Ocean Research Team, National Fisheries Research and Development Institute) ;
  • Yang, Joon-Yong (Ocean Research Team, National Fisheries Research and Development Institute) ;
  • Lee, Young-Sik (Aquaculture Environment Institute) ;
  • Yu, Jun (Marine Environment Research Team, National Fisheries Research and Development Institute) ;
  • Kim, Dae-Kweon (East Sea Fisheries Research Institute) ;
  • Han, In-Seong (Ocean Research Team, National Fisheries Research and Development Institute) ;
  • Go, Woo-Jin (Ocean Research Team, National Fisheries Research and Development Institute)
  • 최용규 (국립수산과학원 해양연구팀) ;
  • 양준용 (국립수산과학원 해양연구팀) ;
  • 이영식 (국립수산과학원 양식환경연구센터) ;
  • 유준 (국립수산과학원 환경연구팀) ;
  • 김대권 (국립수산과학원 동해수산연구소) ;
  • 한인성 (국립수산과학원 해양연구팀) ;
  • 고우진 (국립수산과학원 해양연구팀)
  • Published : 2007.04.30
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Abstract

To analyze the water characteristics in the dry and wet seasons, the data for temperature, salinity, nutrients and $chl-{\alpha}$ were used, which were observed in the south coastal area of Korea during April to October 2000. At Yeosu in the south coast of Korea, the higher values of 35.0 psu in salinity were shown in March and April, the lower values of 23.0 psu in salinity were shown in August and September. The annual range of salinity was 12.0 psu. The total amount of precipitation in the wet season (July to October) was occupied 68% (about 846 mm) during 2000. The precipitation of the dry season (November to June) was occupied 32% (about 394 mm) in the year In the coastal area, the salinity variation is distinct in the period of July to October. Based on this result, we divided the season into two parts: the dry season during April to June and the wet season during July to October. Factor analysis was shown that temperature has strong negative relation and nutrients show positive relations in the dry season by the factor 1, which explains the total valiance of 50.6% at the surface water. In the wet season, salinity has negative relation and nutrients show positive relation by the factor 2, which explains the total variance of 33.5%. The bottom layer also showed similar to those of surface water in the results of factor analysis. These mean that nutrients become rich due to the freshwater inflow in the wet season. The low saline water is shown not only in the south coast but also in the overall region in the South Sea of Korea. It is suggested that the South Sea of Korea may call a ROFI (Region of Freshwater Influence) system in summer.

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