Eddies advected by time‐dependent Sverdrup circulation in the western boundary of the subarctic North Pacific
Eddies advected by time‐dependent Sverdrup circulation in the western boundary of the subarctic North Pacific
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DOI：
10.1029/2003gl017652
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发表时间：
2003-08
影响因子：
5.2
通讯作者：
O. Isoguchi;H. Kawamura
中科院分区：
文献类型：
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作者：
O. Isoguchi;H. Kawamura
据报道，亚北极北太平洋的西边界千岛堪察加海沟（K-K海沟，以下简称K-K海沟）沿线经常存在多个涡流。沿海沟的高度计衍生的海平面异常 (SLA) 的滞后相关图表明，南部涡流总体上沿着 K-K 海沟向东北移动，而北部涡流则向西南移动。通过跟踪每个反气旋涡流，可以计算出其沿海沟的传播速度。跟踪的 7 个涡流的时间序列显示出与 SLA 地图的第一经验正交函数 (EOF) 的季节变化以及 40°N 处的 Sverdrup 输运的季节变化相似的季节变化。此外，当研究区域远程存在两个以上涡流时，它们会表现出连贯的移动模式。这些结果表明，亚北极北太平洋西部边界区域的涡流是由随时间变化的风驱动流产生的平流。
It has been reported that several eddies frequently exist along the Kuril‐Kamchatka Trench (K‐K Trench, hereafter), the western boundary of the subarctic North Pacific. Lagged correlation maps of the altimeter‐derived sea level anomalies (SLAs) along the trench indicate that the southern eddies on the whole move northeastward along the K‐K Trench and the northern eddies, on the other hand, move southwestward. By tracking each anticyclonic eddy, its propagating velocity along the trench is calculated. The time series of the tracked 7 eddies shows similar seasonal variation to those of the first empirical orthogonal function (EOF) of the SLA maps and to those of the Sverdrup transport at 40°N. In addition, when more than two eddies remotely exist in the studied area, they show coherent moving patterns. These results suggest that the eddies in the western boundary region of the subarctic North Pacific are advected by the time‐dependent wind‐driven current.