Time‐frequency variability of Kuroshio meanders in Tokara Strait
Time‐frequency variability of Kuroshio meanders in Tokara Strait
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DOI：
10.1029/2006gl027516
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发表时间：
2006-11
影响因子：
5.2
通讯作者：
Hirohiko Nakamura;T. Yamashiro;A. Nishina;H. Ichikawa
中科院分区：
文献类型：
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作者：
Hirohiko Nakamura;T. Yamashiro;A. Nishina;H. Ichikawa
黑潮路径的弯曲，周期为30-90天，控制着日本的吐噶喇海峡。为了了解这条曲流的时频变化，对1984-2004年期间的两个黑潮指标进行了小波分析。吐噶喇海峡黑潮位置的30-90天变化具有季节固定性，在12 ~ 7月振幅较大。这种现象的变化幅度也受到年际变化的调制，在1989-1992年期间记录了小的变化，在1993-1998年期间记录了大的变化，并从1999-2003年返回到小的变化。这种年际变化与吐噶喇海峡黑潮流量的年际变化呈正相关。2 - 4月期间的最大方差比4 - 5月的最大体积输送提前约1个月，表明中尺度修补剂是体积输送增加的强迫，而不是相反。
The meander of the Kuroshio path, with periods of 30–90 days, dominates Tokara Strait, Japan. To understand the time‐frequency variability of this meander, two Kuroshio indicators were subjected to wavelet analysis for the period 1984–2004. The 30–90 day variance of the position of the Kuroshio in Tokara Strait shows a season‐fixed nature, with larger amplitudes in the period December–July. The amplitude of the variance in this phenomenon is also modulated by interannual variations, with small variance recorded during 1989–1992, large variance during 1993–1998, and a return to small variance from 1999–2003. This interannual variation is positively correlated with that of Kuroshio volume transport in Tokara Strait. The largest variance during February–April precedes the largest volume transport in April–May by about 1 month, suggesting that mesoscale menders are the forcing of the volume transport increase, not the other way around.