2012 Fiscal Year Final Research Report
Understanding the mechanism for decadal variability of oceanic jets in the North Pacific and the North Atlantic
| Project/Area Number |
23840001
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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 | Hokkaido University |
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Principal Investigator |
SASAKI Yoshinori 北海道大学, 大学院・理学研究院, 特任助教 (50604815)
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| Project Period (FY) |
2011 – 2012
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| Keywords | 海洋物理・陸水学 / 気候変動 / 海洋ジェット / 大気海洋相互作用 / 十年変動 / メ キシコ湾流 / 黒潮続流 |
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| Research Abstract |
Mechanisms for decadal variability of the Kuroshio Extension and the Gulf Stream jets are examined. It is revealed that the meridional shifts of these jets on decadal timescales are induced by westward propagating signals that are caused by atmospheric fluctuations. These signals do not propagate as a traditional linear long Rossby wave, but propagate as a jet-trapped Rossby wave, which was proposed by our previous study. Our results indicate a predictability of the decadal variability of the Kuroshio Extension and the Gulf Stream jets for several years, and give a physical basis for the prediction.
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