2023, 43(2): 67-76. doi: 10.3969/j.issn.1673-9159.2023.02.009
关键词： 中尺度涡 , 季节变化 , 涡旋活动 , 南大洋 , 涡动能
Keywords： mesoscale eddies , seasonal variation , eddy activity , the Southern Ocean , eddy kinetic energy
【目的】了解南大洋中尺度涡的活动规律。【方法】利用AVISO提供的1993—2020年中尺度涡轨迹数据集META3.2DT，通过合成分析和能量分析，探讨南大洋寿命为30 d以上中尺度涡出现数（EON）的季节变化及动力机制。【结果和结论】南大洋EON存在显著季节变化，即夏季多（2月达到最大值）春季少（9月达到最小值），且与涡动能季节变化紧密相关。涡旋的振幅、转速和强度呈现出与EON大致相反的季节变化，即春季大夏季小。合成分析表明，风场的季节变化引起“涡旋消亡”强度的变化，进而影响EON季节变化。能量分析表明，EON季节变化受正压不稳定的调控。
【目的】了解南大洋中尺度涡的活动规律。【方法】利用AVISO提供的1993—2020年中尺度涡轨迹数据集META3.2DT，通过合成分析和能量分析，探讨南大洋寿命为30 d以上中尺度涡出现数（EON）的季节变化及动力机制。【结果和结论】南大洋EON存在显著季节变化，即夏季多（2月达到最大值）春季少（9月达到最小值），且与涡动能季节变化紧密相关。涡旋的振幅、转速和强度呈现出与EON大致相反的季节变化，即春季大夏季小。合成分析表明，风场的季节变化引起“涡旋消亡”强度的变化，进而影响EON季节变化。能量分析表明，EON季节变化受正压不稳定的调控。
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