| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2013: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2012: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
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| Outline of Final Research Achievements |
Data analysis was performed on 2000-day-long time series of the deep current velocity to the east of Tohoku, Japan. Variability is dominant widely at the periods from three to six months, and weak at the annual and longer periods. As a result, year-long mean velocities are rather constant. Near the Japan Trench, the phase propagation is clearly identified along it, and above the abyssal plain, it seems westward. A good agreement of energy spectra with a two-layer model simulation driven only by surface wind suggests the variability is caused mainly by wind.
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