Understanding the mechanism for decadal variability of oceanic jets in the North Pacific and the North Atlantic

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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.