Kuroshio variations in the upstream region as seen by HF radar and satellite altimetry data
Kuroshio variations in the upstream region as seen by HF radar and satellite altimetry data
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DOI：
10.1080/01431160802175454
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发表时间：
2008-11
影响因子：
3.4
通讯作者：
Kaoru Ichikawa;R. Tokeshi;M. Kashima;Kenji Sato;T. Matsuoka;S. Kojima;Satoshi Fujii
中科院分区：
文献类型：
--
作者：
Kaoru Ichikawa;R. Tokeshi;M. Kashima;Kenji Sato;T. Matsuoka;S. Kojima;Satoshi Fujii
通过结合高分辨率高频（HF）海洋雷达数据和广覆盖测高数据来研究黑潮的位置和速度的变化。黑潮的速度及其位置是根据 2001 年 8 月至 2005 年 2 月的高频雷达数据估计的表面地转速度每日图确定的，沿台湾东北方向 123.35°E 确定。发现这两者对于几个月周期的中尺度变化具有良好的相关性，因为黑潮的轴向南（或向北）移动时往往会更快（或更慢）。这种趋势在夏季尤为明显，此时黑潮季节性增强，并且在高频雷达数据中清晰可见。通过与卫星高度计观测到的海面动态高度异常的相关性，发现东海的这些黑潮变化是由来自21°N以东的中尺度涡流与台湾以东的黑潮曲流的重合引起的。
Variations of the position and speed of the Kuroshio are studied by a combination of high‐resolution high‐frequency (HF) ocean radar data and wide‐coverage altimetry data. The speed of the Kuroshio and its position are determined along 123.35° E northeast of Taiwan from daily maps of surface geostrophic velocity estimated from HF radar data from August 2001 to February 2005. These two are found to be well correlated for mesoscale variations with periods of a few months, as the Kuroshio tends to be faster (or slower) when its axis moves south (or north). This tendency is significant in summer when the Kuroshio is seasonally intensified and well‐defined in the HF radar data. By taking correlation with the sea surface dynamic height anomaly observed by satellite altimeters, these Kuroshio variations in the East China Sea are found to be induced by merging of mesoscale eddies from the east at 21° N and by coincident Kuroshio meanders east of Taiwan.