| 摘要: |
| 为研究对中国台湾以东海域黑潮路径及其变化，本文基于法国空间局AVISO中心提供的1993-2015年的卫星遥感海表流场逐日资料，对121°-125°E，22.4°-25°N海域黑潮路径进行了逐日识别，得到了共计23年累计8400天的台湾以东黑潮流轴的逐日路径，并研究其在不同纬度的流轴位置及其对应的表面黑潮流量的时空变化规律。主要结论如下：（1）采用模糊C-均值聚类法对台湾以东黑潮流轴路径进行聚类分析，发现台湾以东黑潮流轴在24°N以南出现明显摆动，形成正常和偏东两种路径；黑潮流轴存在明显的时间变化，流轴偏东现象年平均大约出现25次，大致每隔3年出现一次偏东较少的现象，各月流轴偏东次数以4、5月最少，10月至次年3月较多；（2）台湾以东黑潮表面流量大小在6.2-8.3×104m2/s之间；总体上来说，纬度越高流量越大，在23.5°N左右范围内存在一个流量低值中心；在24.3°N以北流量总体较大，且增长趋势稳定，同时表面流量大小具有较强的季节和年际变化特征。 |
| 关键词: 黑潮流轴识别 台湾以东黑潮 模糊C-均值聚类 黑潮表面流量 |
| DOI：10.11693/hyhz20170700185 |
| 分类号:P731 |
| 基金项目:国家自然科学基金项目，41206002号，41775053号，41706021号；中国科学院战略性先导科技专项项目，XDA1101010号；国家自然科学基金重大研究计划重点支持项目，91428206号；中国博士后科学基金项目，2014M551711号；国家海洋局第二海洋研究所基本科研业务费专项项目，JG1416号。 |
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| IDENTIFICATION OF THE KUROSHIO PATH EAST OF TAIWAN AND ITS VARIATION |
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WANG Hui-Zan1,2, WEI Lin-Jin2,3, ZHANG Quan-Li4, LIU Lei2, LIU Ke-Feng2
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1.State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;2.Institute of Meteorology and Oceanography, National University of Defense Technology, Changsha 410073, China;3.Fujian Naval Base Command Beacon Survey Team, Fuzhou 350500, China;4.Army University of Engineering, Nanjing 211101, China
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| Abstract: |
| Based on the 23-year (1993-2015) satellite-derived daily surface current data (a total of 8400 days) available from the AVISO(Archiving, Validation, and Interpretation of Satellite Oceanographic data)center, we identified the daily path of the Kuroshio east of Taiwan (119°-126°E, 22.4°-25°N), and investigated the variation of the axis position and surface Kuroshio intensity in different latitudes. Fuzzy C-means clustering algorithm (FCM) was used to cluster the Kuroshio axes east of Taiwan. It is found that the Kuroshio axis east of Taiwan swang obviously at 24°N and formed two paths, i.e., normal and eastward ones. The Kuroshio axes presented a clear temporal variation. The frequent of the axis apt to be eastern is~25 times per year on average. On the country, the less frequent of the phenomenon occurred approximately every three years. The frequent of the phenomenon was low in April and May, and high in October to March of next year. The surface Kuroshio intensity east of Taiwan was between 6.2-8.3×104m2/s. In general whole, the higher the latitude, the greater the intensity. There was a low-flow center at about 23.5N°. In the north of 24.3N°, the intensity was large and grows steadily. Moreover, the surface Kuroshio intensity showed strong seasonal and interannual variations. |
| Key words: Kuroshio axis identification Kuroshio east of Taiwan fuzzy C-means clustering algorithm surface Kuroshio intensity |
