2010 Fiscal Year Final Research Report
Spatial-Temporal variations of the North Pacific Intermediate Water and its relationship with the large-scale atmospheric field
| 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
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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 |
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| 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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