Recent upward shift of the deep convection system in the Japan Sea, as inferred from the geochemical tracers tritium, oxygen, and nutrients

Mathematics – Logic

Scientific paper

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Oceanography: General: Descriptive And Regional Oceanography, Oceanography: General: Marginal And Semienclosed Seas, Oceanography: Biological And Chemical: Chemical Tracers, Oceanography: Biological And Chemical: Plankton

Scientific paper

The thermohaline circulation system in the Japan Sea, an almost land-locked marginal sea in the northwest Pacific, is now in a transition state. Comparison of vertical profiles of tritium, oxygen and nutrients between 1984 and 1998 demonstrates the following two points: (1) the supply of dense surface seawater to the bottom layer (>2,500 m in depth) has almost ceased since 1984, and (2) the intrusion of surface seawater to an intermediate depth range (between ~700 m and ~2,000 m in depth) has been reinforced during this 14-year period. Such transitional upward shift of the thermohaline conveyor belt in the Japan Sea is thought to have separeted the bottom water from the conveyor belt and brought about a stagnant mode of the bottom water.

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