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中文摘要：
利用卫星遥感资料结合历史水文资料分析了斯里兰卡冷涡的季节演变及其形成机制。分析表明，斯里兰卡冷涡发生于每年的6—10月之间，其中心位于8°N、83°E，垂直深度可至250m。西南季风受斯里兰卡岛地形的阻挡而在其东侧海域形成气旋式风应力旋度引起的向上Ekman抽吸是冷涡产生的主要原因。冷涡随季节的发展先朝东北、后朝西北方向移动，造成冷涡的季节平均位置比气旋式风应力旋度偏北1—2个纬度。西南季风漂流的平流作用以及基于β平面的简单涡旋传播理论可分别用于解释涡旋的东北向和西北向运动。
英文摘要：
Satellite remote-sensing data, combined with historical hydrographic data, is used to analyze the seasonal evolution of Sri Lanka cold eddy and its generation mechanism. It is suggested that the cold eddy appears during June-October, with its core at 8°N, 83°E and its vertical extent extending to the depth of 250m. The upward Ekman pumping which is induced by a mesoscale cyclonic wind stress curl to the east of the island formed due to the blocked southwest monsoon by the Sri Lanka Island is vital for the generation of the eddy. The location of the eddy is 1°-2° latitude to the north of the cyclonic wind stress curl, which is due to northeastward and then northwestward movement of the eddy as the season progresses. Its northeastward and northwestward movement can be explained by the advection forcing induced by the southwest monsoon current and the simple theories for vortex propagation on a β-plane, respectively.
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