| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Outline of Final Research Achievements |
To clarify evidence of slowing thermohaline circulation based on the observational data, we conducted ship-based temperature, salinity, and dissolved oxygen measurements in super-deep trenches with their surroundings along the pathway of the deep circulation. We successfully measured seawater density in the deep ocean for the first time by using the refractive index density sensor. We also evaluated and corrected the batch-to-batch offsets of the Standard Seawater for salinity measurement and found recent freshening (-0.0006 g/kg/decade) in the deep North Pacific for the first time, which might be related to a reduction of the formation rate of Antarctic Bottom Water.
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