Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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Tower-based Flux Measurement Using the Eddy Covariance Method at Ieodo Ocean Research Station

이어도해양과학기지에서의 에디 공분산 방법을 이용한 플럭스 관측

  • Lee, Hee-Choon (Department of Atmosphieric Science/Global Environment Laboratory Yonsei University) ;
  • Lee, Bang-Yong (Korea Polar Research Institute, KORDI) ;
  • Kim, Joon (Department of Atmosphieric Science/Global Environment Laboratory Yonsei University) ;
  • Shim, Jae-Seol (Coastal and Harbor Engineering Research Division, KORDI)
  • 이희춘 (연세대학교 대기과학과/지구환경연구소) ;
  • 이방용 (한국해양연구원 부설 극지연구소) ;
  • 김준 (연세대학교 대기과학과/지구환경연구소) ;
  • 심재설 (한국해양연구원 연안.항만공학연구본부)
  • Published : 2004.06.30
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Abstract

Surface energy and $CO_2$ fluxes have been measured over an ocean at Ieodo Ocean Research Station of KORDI since May 2003. Eddy covariance technique, which is a direct flux measurement, is used to quantitatively understand the interaction between the ocean surface and the atmospheric boundary layer. Although fluxes were continuously measured during the period from May 2003 to February 2004, the quality control of these data yielded <20% of data retrieval. The atmospheric stability did not show any distinct dirunal patterns and remained near-neutral to stable from May to June but mostly unstable during fall and winter in 2003. Sensible heat flux showed a good correlation with the difference between the sea water temperature and the air temperature. The maximum fluxes of sensible heat and latent heat were $120Wm^{-2}$ and $350Wm^{-2}$ respectively, with an averaged Bowen ratio of 0.2. The ocean around the tower absorbed $CO_2$ from the atmosphere and the uptake rates showed seasonal variations. Based our preliminary results, the daytime $CO_2$ flux was steady with an average of $-0.1 mgCO_2m^{-2}s^{-1}$ in summer and increased in winter. The nighttime $CO_2$ uptake was greater and fluctuating, reaching up to $-0.1 mgCO_2m^{-2}s^{-1}$ but these data require further examination due to weak turbulent mixing at nighttime. The magnitude of $CO_2$ flux was positively correlated with the half hourly changes in horizontal mean wind speed. Due to the paucity of quality data, further data collection is needed for more detailed analyses and interpretation.

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References

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