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Decadal Response of the Kuroshio Extension Jet to Rossby Waves: Observation and Thin-Jet Theory

机译:黑潮扩展射流对Rossby波的年代际响应:观测和薄射流理论

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摘要

This study examines interannual to decadal variability of the Kuroshio Extension (KE) jet using satellite altimeter observations from 1993 to 2010. The leading empirical orthogonal function (EOF) mode of sea level variability in the KE region represents the meridional shift of the KE jet, followed by its strength changes with a few month lag. This shift of the KE jet lags atmospheric fluctuations over the eastern North Pacific by about three years. Broad sea level anomalies (SLAs) emerge in the eastern North Pacific 3-4 years before the upstream KB jet shift, and propagate westward along the KE jet axis. In the course of the propagation, the meridional scale of the SLAs gradually narrows, and their amplitude increases. This westward propagation of SLAs with a speed of about 5 cm s(-1) is attributed to the westward propagation of the meridional shift of the jet, consistent with the thin-jet theory, whose importance has been suggested by previous numerical studies. In addition, the westward-propagating signals tend to conserve their quasigeostrophic potential vorticity anomaly, which may explain the characteristic changes of SLAs during the propagation. After the westward-propagating signals of positive (negative) SLAs reach at the east coast of Japan, the upstream KB jet strengthens (weakens) associated with the strength changes of the northern and southern recirculation gyres. Interestingly, this strength change of the KE jet propagates eastward with a speed of about 6 cm s(-1), suggesting an importance of advection by the current.
机译:这项研究使用1993年至2010年的卫星高度计观测资料研究了黑潮扩展(KE)喷气机的年际至年代际变化。KE区域海平面变化的主导经验正交函数(EOF)模式代表了KE喷气机的子午位移,其次是力量的变化,有几个月的滞后。 KE射流的这种变化使北太平洋东部的大气波动滞后了大约三年。在上游KB射流移位之前3-4年,北太平洋东部出现了广泛的海平面异常(SLA),并沿KE射流轴向西传播。在传播过程中,SLA的子午尺度逐渐变窄,其幅度增加。 SLA以约5 cm s(-1)的速度向西传播的原因是射流经向偏移的西向传播,这与稀薄射流理论是一致的,稀疏射流理论的重要性已由先前的数值研究表明。此外,向西传播的信号倾向于保留其准地转势涡度异常,这可以解释SLA在传播过程中的特征变化。在正向(负向)SLA的向西传播信号到达日本东海岸后,上游KB射流随着北部和南部回旋涡的强度变化而增强(减弱)。有趣的是,KE射流的这种强度变化以约6 cm s(-1)的速度向东传播,这表明洋流对流的重要性。

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