| Project/Area Number |
21840010
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Single-year Grants |
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| Research Field |
Meteorology/Physical oceanography/Hydrology
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| Research Institution | Tohoku University |
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Principal Investigator |
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| Project Period (FY) |
2009 – 2010
|
| Project Status |
Completed (Fiscal Year 2010)
|
| Budget Amount *help |
¥2,418,000 (Direct Cost: ¥1,860,000、Indirect Cost: ¥558,000)
Fiscal Year 2010: ¥1,027,000 (Direct Cost: ¥790,000、Indirect Cost: ¥237,000)
Fiscal Year 2009: ¥1,391,000 (Direct Cost: ¥1,070,000、Indirect Cost: ¥321,000)
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| Keywords | 北太平洋中層水 / アリューシャン低気圧 / 海洋長波ロスビー波 / 10年規模変動 / 10年周期変動 / 海洋ロスビー波 / 主密度躍層 / 黒潮流量 / 大気テレコネクション / 10年規模周期変動 |
|---|
| Research Abstract |
The North Pacific Intermediate Water (NPIW), which is characterized as a vertical salinity minimum layer, is distributed at a depth of 200-1000m. In this study, we investigated temporal features of NPIW area by using the repeat hydrographic section along 137E meridian conducted by the Japan Meteorological Agency from 1972 to 2008. Variations of NPIW area showed a clear quasi-decadal (about 10 years)modulation. By using a wind-driven hindcast model, it was found that the NPIW area modulation was caused by the first-mode baroclinic ocean response to the Aleutian Low activities located in the central North Pacific.
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