2010 Fiscal Year Final Research Report
Dynamic systems approach on variations of intensive currents in ocean double gyre
| Project/Area Number |
20540431
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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 | University of Toyama |
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Principal Investigator |
MATSUURA Tomonori University of Toyama, 大学院・理工学研究科, 教授 (10414400)
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| Co-Investigator(Kenkyū-buntansha) |
SHIMOKAWA Shinya 防災科学技術研究所, 水土砂研究部, 主任研究員 (40360367)
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| Co-Investigator(Renkei-kenkyūsha) |
IIZUKA Satoshi 防災科学技術研究所, 水土砂研究部, 主任研究員 (40414403)
KAMACHI Masafumi 気象研究所, 海洋研究部, 研究部・部長 (00354548)
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| Project Period (FY) |
2008 – 2010
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| Keywords | 黒潮・黒潮続流域 / ダブルジャイヤー海洋大循環 / 非線形力学 / 準地衡流渦位方程式 / 十年-数十年変動 / カオス |
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| Research Abstract |
From the viewpoint of nonlinear dynamics, it is investigated how the eastward strong currents induce the self-organized long-time variations that are associated with the stable and unstable modes. To identify these long-time variations, we used dynamic system models, a quasi-geostrohic model, and ocean data assimilation data. As a result, it was found that entrainment and intermittency appear in the eastward strong currents depending on strengths of seasonal varying wind stress. Moreover, decadal/interdecadal variations are generated in the double gyre based on self-organized dynamic modes.
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