Influence of Mesoscale Eddies on Variations of the Kuroshio Path South of Japan
Influence of Mesoscale Eddies on Variations of the Kuroshio Path South of Japan
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DOI：
10.1023/a:1022856122033
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发表时间：
2003-02
影响因子：
2.3
通讯作者：
N. Ebuchi;K. Hanawa
中科院分区：
文献类型：
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作者：
N. Ebuchi;K. Hanawa
利用1993 ~ 1999年7年的黑潮轴位置时间序列和高度计海面高度图，研究了中尺度涡旋对日本以南黑潮路径变化的影响。结果表明，气旋性涡旋和反气旋性涡旋都可能与黑潮相互作用，触发黑潮的短-虽然并非所有接近黑潮或与黑潮碰撞的涡旋都形成了曲折。在四国和盐之岬以南海域，发现一个周期约5-6个月的反气旋涡旋沿沿着30°N向西传播，并在九州以东或四国以南海域与黑潮碰撞。这种碰撞有时会引发蜿蜒，蔓延到日本南部的整个地区。该涡旋向下游平流输送，在盐之岬以东的下游侧产生了一条曲流。在经过盐之岬后，它与黑潮分离，并开始再次向西移动。有时，这个涡旋会与其他从东部来的反气旋涡旋合并。在黑潮延伸区也产生了气旋性涡旋，并在日本南部的黑潮回流区向西传播，进入九州东部的黑潮，也触发了主要只在盐之岬以西地区传播的弯曲。
The influences of mesoscale eddies on variations of the Kuroshio path south of Japan have been investigated using time series of the Kuroshio axis location and altimeter-derived sea surface height maps for a period of seven years from 1993 to 1999, when the Kuroshio followed its non-large meander path. It was found that both the cyclonic and anticyclonic eddies may interact with the Kuroshio and trigger short-term meanders of the Kuroshio path, although not all eddies that approached or collided with the Kuroshio formed meanders. An anticyclonic eddy that revolves clockwise in a region south of Shikoku and Cape Shionomisaki with a period of about 5–6 months was found to propagate westward along about 30°N and collide with the Kuroshio in the east of Kyushu or south of Shikoku. This collision sometimes triggers meanders which propagate over the whole region south of Japan. The eddy was advected downstream, generating a meander on the downstream side to the east of Cape Shionomisaki. After the eddy passed Cape Shionomisaki, it detached from the Kuroshio and started to move westward again. Sometimes the eddy merges with other anticyclonic eddies traveling from the east. Coalescence of cyclonic eddies, which are also generated in the Kuroshio Extension region and propagate westward in the Kuroshio recirculation region south of Japan, into the Kuroshio in the east of Kyushu, also triggers meanders which mainly propagate only in a region west of Cape Shionomisaki.