| Budget Amount *help |
¥6,760,000 (Direct Cost: ¥5,200,000、Indirect Cost: ¥1,560,000)
Fiscal Year 2014: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2013: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2012: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| Outline of Final Research Achievements |
Stability of the water column and properties of deep convection have been investigated by experiments with a model resolving turbulent motion. Under sea-ice cover, while convective motion is suppressed in the mixed layer by Earth rotation and larger background viscosity and diffusivity, destabilization of the water column is hastened. This is partly because the negative feedback mechanism which prevents the mixed layer from being densified becomes less active and partly because the enhanced mixing at the base of the mixed layer causes densification due to the cabbeling effect. When viscosity and diffusivity increases by the order of one, overturning of the water column is hastened by more than one month, suggesting significant effects on the long-term global deep circulation.
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