台湾东北部黑潮表层水入侵东海陆架的季节变化规律

The seasonal variability of the Kuroshio surface water intrusion onto the East China Sea continental shelf derived from Argos drifter data

基于1998-2011年进入台湾东北部的WOCE-SVP（World Ocean Circulation Experiment -Surface Velocity Programme）计划的Argos浮标运行轨道数据，分析了台湾东北部的环流特征、黑潮表层水入侵东海陆架的季节变化规律。结果表明：在春夏季，黑潮表层水入侵仅限于陆架外缘，而在秋冬季，黑潮表层水可深入东海陆架或进入台湾海峡。自黑潮区入侵至100 m和150 m等深线的浮标数量在秋冬季较多，春夏季较少。台湾海峡的浮标轨迹在春夏季几乎皆为北向，在秋冬季皆为南向。在秋季，东海中部和南部陆架会在黑潮西侧出现逆流和涡旋。可见，台湾东北部环流具有显著的季节特征；黑潮表层水入侵东海陆架在秋冬季较强，春夏季较弱。本研究采用最新的Argos浮标数据，揭示了台湾东北部黑潮入侵东海陆架的季节变化规律。

In this paper, based on the trajectory data of the Argos drifters from WOCE-SVP （World Ocean Circulation Experiment – Surface Velocity Programme） which once entered the northeast of Taiwan, we analyzed the circulation pattern of northeast of Taiwan and the variability of the Kuroshio surface water intrusion onto the East China Sea con-tinental shelf. The result showed that： in spring and summer, the Kuroshio surface water intrusion is restricted to the outer continental shelf, but in fall and winter, the Kuroshio surface water intrudes further onto the East China Sea con-tinental shelf or enters the Taiwan Strait. The number of the drifters which intrude to the 100 m and 150 m isobath from the Kuroshio region is large in fall and winter, and is little in spring and summer. The trajectories of the drifters in Taiwan Strait move northward in spring and summer, but southward in fall and winter. In fall, inverse flow and eddy can be found in the central and southern continental shelf. As mentioned above, the circulation of northeast of Taiwan exhibits prominent seasonal feature： the Kuroshio surface water intrusion onto the East China Sea continental shelf is strong in fall and winter, and weak in spring and summer. This paper utilizes the latest Argos drifter data to reveal the seasonal variability of Kuroshio surface water intrusion onto the East China Sea continental shelf.