Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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Phosphate vs. Silicate Discontinuity Layer Developed at Mid-Depth in the East Sea

동해 중층에 발달하는 인산염 대 규산염 비의 불연속층

  • Kim, Bong-Guk (Department of Ocenography, College of Natural Sciences Pusan National University) ;
  • Lee, Tong-Sup (Department of Ocenography, College of Natural Sciences Pusan National University) ;
  • Kim, Il-Nam (Marine Science Institute University of Texas at Austin)
  • 김봉국 (부산대학교 자연과학대학 해양시스템과학과) ;
  • 이동섭 (부산대학교 자연과학대학 해양시스템과학과) ;
  • 김일남 (오스틴 텍사스대학교 해양연구소)
  • Received : 2010.08.11
  • Accepted : 2010.09.14
  • Published : 2010.09.30
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Abstract

The CREAMS (Circulation Research of the East Asian Marginal Sea) survey in 1999 revealed a sharp mid-depth discontinuity of the phosphate:silicate ratio in all basins of the East/Japan Sea. Incidentally, this discontinuity layer corresponds to the oxygen minimum layer. Directly below the discontinuity layer, oxygen concentration is increased. This increase in oxygen concentration is interpreted as a proof of intermediate water formation. Oxygen minimum indicates that the water parcel is old and stable against mixing. So it seems be an efficient barrier to vertical exchange of materials. This means that, once materials enter the lower domain, they rarely return to the upper domain. Therefore, the biogeochemistry of the East/Japan Sea depends heavily on material input through the Korea Strait, and flux is expected to be sensitive to the climate change. As a result, the East/Japan Sea ecosystem seems vulnerable to tipping (regime shift), which occurred on a decadal time scale.

Keywords

References

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