Dissolved Oxygen at the Bottom Boundary Layer of the Ulleung Basin, East Sea

동해 울릉분지 해저 경계면의 용존산소

  • Kang, Dong-Jin (Marine Instrument Service and Calibration Department, KORDI) ;
  • Kim, Yun-Bae (Ocean Science & Technology Institute Pohang University of Science and Technology) ;
  • Kim, Kyung-Ryul (School of Earth and Environmental Sciences/Research Institute of Oceanography Seoul National University)
  • 강동진 (한국해양연구원 기기 검.교정 분석센터) ;
  • 김윤배 (포항공과대학교 해양대학원) ;
  • 김경렬 (서울대학교 지구환경과학부(BK21)/해양연구소)
  • Received : 2010.08.11
  • Accepted : 2010.10.22
  • Published : 2010.12.30


General consensus on typical vertical profile of dissolved oxygen in the Ulleung Basin is that dissolved oxygen concentration beyond 300 m decreases with increasing depth. However, the results of our observations in 2005 and 2006 revealed three different dissolved oxygen distribution types in the deep layer of the Ulleung Basin. The first type showed oxygen concentration decreasing with increasing depth (Type-1), the second showed oxygen concentration decreasing very sharply near the bottom boundary layer but constant in the bottom adiabatic layer (Type-2), the final was of the oxygen minimum layer above the bottom boundary layer (Type-3). Type-2 was the most common pattern in the Ulleung Basin. Type-1 was most common close to the Japan Basin, including the Ulleung Interplane Gap, while Type-3 was found around Dok do. Oxygen Consumption Rate (OCR) at surface sediment estimated using the dissolved oxygen distribution at the bottom boundary layer was $0.2{\sim}5.8\;mmol{\cdot}m^{-2}d^{-1}$, which coincided with OCR from direct sediment incubation. This implies that organic matter decomposition at surface sediment may play an important role in dissolved oxygen distribution patterns at the bottom boundary layer of the Ulleung Basin.


Supported by : 학술진흥재단


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