Through data diagnosis and dynamic analysis, this study aims to reveal the potential influence of the Subtropical Dipole Pattern (SDP) in the southern Indian Ocean on the interannual variation of south polar sea ice. The results indicate that a robust teleconnection exists between the SDP and south polar sea ice. At least two months in advance, the SDP significantly affects the Antarctic summer sea-ice anomalies. Specifically, during the positive (negative) phase of the SDP, the Amundsen–Ross Sea and the western Indian Ocean sectors exhibit significant positive (negative) sea-ice anomalies, accompanied by negative (positive) sea-ice anomalies in the Bellingshausen Sea and the Weddell Sea. Planetary wave trains, stimulated over the SDP by anomalous rainfall and latent heat release, establish this teleconnection. These planetary wave trains, guided by westerly jets, then spread eastward and poleward, causing atmospheric circulation anomalies that affect Antarctic sea ice. The Antarctic sea-ice anomalies connected to the SDP are mostly consistent with abnormalities in the surface air temperature and wind fields.

中文翻译：

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南印度洋副热带在南极夏季海冰年际变率中的作用


本研究旨在通过数据诊断和动力学分析，揭示南印度洋副热带偶极子模式（SDP）对南极海冰年际变化的潜在影响。结果表明，SDP 和南极海冰之间存在强大的遥相关。至少提前两个月，SDP 对南极夏季海冰异常产生了重大影响。具体来说，在 SDP 的正（负）阶段，阿蒙森-罗斯海和西印度洋部分表现出显著的正（负）海冰异常，伴随着贝灵斯豪森海和威德尔海的负（正）海冰异常。行星波列车在 SDP 上受到异常降雨和潜热释放的刺激，建立了这种遥相关。这些行星波列车在西风急流的引导下，然后向东和极地传播，导致影响南极海冰的大气环流异常。与 SDP 相关的南极海冰异常与地表气温和风场异常基本一致。