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

研究了黑潮延伸区和湾流急流年代际变化的机制。结果表明，这些急流在年代际时间尺度上的经向漂移是由大气起伏引起的西传信号引起的。这些信号并不像传统的线性长Rossby波那样传播，而是以我们以前的研究提出的喷流捕获Rossby波的形式传播。我们的结果表明，黑潮延伸区和墨西哥湾流急流的年代际变化在几年内是可预测的，并为预测提供了物理基础。

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.