基于聚类的时空轨迹特征挖掘——以中尺度涡轨迹为例-海洋预报

基于聚类的时空轨迹特征挖掘——以中尺度涡轨迹为例

单位：1. 上海海洋大学信息学院, 上海 201306;
2. 自然资源部东海预报中心, 上海 200136;
3. 上海电力大学, 上海 200090

分类号：P731.2

出版年·卷·期（页码）：2022·39·第四期（69-78）

摘要：

采用密度聚类方法对中长生命周期中尺度涡轨迹进行聚类分析，分析比较了不同类簇中尺度涡的轨迹特征、时空分布以及生成和消亡的空间分布特征。结果表明：随着纬度的增加，不同轨迹类别的振幅增大，旋转速度和半径却呈现递减趋势，反气旋涡轨迹变化更快速，轨迹更易受地理位置影响。南海南部春冬季气旋涡较多，反气旋涡更易出现在夏秋季；南海中部中尺度涡向西移动；南海北部中尺度涡向西北移动。此外，位于越南东南部的中尺度涡轨迹表现出更活跃、更复杂的特性。

We analyze the trajectory of medium and long life cycle eddy in the South China Sea using the density clustering method, and compare the track, spatial and temporal characteristics, spatial distribution of generation and decay of the mesoscale eddies belonging to different clusters. The results show that the amplitude of different trajectory clusters increases with latitude, while the rotational speed and radius shows a decrease trend. In addition, the trajectory of anticyclonic eddy changes faster and is more susceptible to geographical location. In the southern South China Sea, there are more cyclonic eddies in spring and winter, while anticyclonic eddies are more likely to occur in summer and autumn. The mesoscale eddies move westward in the middle of the South China Sea, and there are eddies moving northwestward in the northern South China Sea. In addition, the trajectories of mesoscale eddies show more active and complex characteristics to the southeast of Vietnam.

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