Fisheries and Aquatic Sciences

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Evidence of Vertical Mixing Caused by High Frequency Internal Waves along the Eastern Coast of Korea

  • Han, In-Seong (Ocean Research Team, National Fisheries Research and Development Institute) ;
  • Lee, Ju (Resource Enhancement Research Team, East Sea Fisheries Research Institute) ;
  • Jang, Lee-Hyun (Ocean Research Team, National Fisheries Research and Development Institute) ;
  • Suh, Young-Sang (Ocean Research Team, National Fisheries Research and Development Institute) ;
  • Seong, Ki-Tack (Ocean Research Team, National Fisheries Research and Development Institute)
  • Published : 2008.03.31
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Abstract

Internal waves and internal tides occur frequently along the eastern coast of Korea. During the spring-tide period in April 2003, the East Korean Warm Current (EKWC) flowed near the Korean East Coast Farming Forecast System (KECFFS; a moored oceanographic measurement system), creating a strong thermocline at the intermediate layer. Weakened stratification and well-mixed water appeared frequently around the KECFFS, with duration of approximately 1 day. The results suggest the following scenario. Baroclinic motion related to the internal tide generated high frequency internal waves around the thermocline. The breaking of those waves then created turbulence around the thermocline. After well-mixed water appeared, a current component with perpendicular direction to the EKWC appeared within the inertial period. The change in stratification around the KECFFS locally broke the geostrophic balance as a transient state. This local vertical mixing formed an ageostrophic current within the inertial period.

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References

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