2012 Fiscal Year Final Research Report
Relation between subduction processes and surface-layer nutrient variations in the North Pacific subtropical gyre
| Project/Area Number |
22540445
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Meteorology/Physical oceanography/Hydrology
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| Research Institution | Tohoku University |
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Principal Investigator |
SUGA Toshio 東北大学, 大学院・理学研究科, 教授 (70211977)
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| Project Period (FY) |
2010 – 2012
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| Keywords | サブダクション / 亜熱帯循環 / 栄養塩 / 溶存酸素 / 有機物 / モード水 / Argo |
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| Research Abstract |
Based on the analyses of ocean climatology, repeat hydrography and the data from profiling floats equipped with oxygen sensors, variations of nutrient and dissolved oxygen along the advection path from the formation region of major water masses in the North Pacific are described. In particular, a vertical profile of time rate of dissolved-oxygen-concentration change in the area dominated by the subtropical mode water is revealed. Significant change in the subduction rate associated with the Pacific Decadal Oscillation is detected, with suggesting its influence on subsurface nutrient distribution.
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