观测和模拟研究表明，涡旋-Ekman抽吸是引起反气旋涡内部高叶绿素浓度的主要机制之一，但其相关理论仍有待完善。基于现有理论和初步统计结果，南海反气旋涡的形态和相应海面风场具有显著的季节-空间差异性，而两者与涡旋-Ekman抽吸效应之间亦存在一定联系。本项目将结合现场观测数据、卫星遥感资料、高分辨率再分析资料和数值模式，研究南海反气旋涡形态及涡旋-Ekman抽吸效应的季节-空间特征；在此基础上，结合动力诊断与理论研究，探讨涡旋形态和相应风场的变化对涡旋-Ekman抽吸效应的影响机制。本项目的开展将有助于提高对南海涡旋动力过程及其生态效应的认识。

Both observations and numerical studies indicate that eddy-Ekman pumping is one of the important factors that may induce high chlorophyll concentration inside anticyclonic eddies. However, its theory still needs further improvement. Based on existing theory and preliminary statistical results, the shapes of anticyclonic eddies and the relative wind fields in the South China Sea show significant seasonal-spatial variations. In addition, both of them are closely related to the strength of eddy-Ekman pumping. By using field observations, satellite measurements, and reanalysis products with high resolution and numerical models, this program will examine the characteristics of the shapes of anticyclonic eddies, the effects of eddy-Ekman pumping, and their spatial-seasonal variations in the South China Sea. Furthermore, combining with numerical studies and dynamic diagnosis, the underlying mechanism for the changes of the eddy shapes and relative wind fields influencing the effects of eddy-Ekman pumping will be discussed. This work will enhance our knowledge on the dynamic processes and ecological effects of eddies in the South China Sea.