The Influence of the Indian Ocean Dipole on Antarctic Sea Ice
The Influence of the Indian Ocean Dipole on Antarctic Sea Ice
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DOI：
10.1175/jcli-d-14-00390.1
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发表时间：
2015-03
影响因子：
4.9
通讯作者：
M. Núncio;X. Yuan
中科院分区：
文献类型：
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作者：
M. Núncio;X. Yuan
摘要本文探讨了印度洋偶极子（IOD）对南半球海冰变化的影响。对9 - 11月海冰密集度和海表温度（SST）距平的奇异值分解（SVD）揭示了太平洋的厄尔尼诺-南方涛动（ENSO）和赤道印度洋的IOD。IOD对南极洲太平洋部分海冰的影响的相对重要性很难评估，原因有二：1）ENSO在太平洋和威德尔海产生较大的异常，2）许多正（负）IOD与厄尔尼诺（拉尼娜）同时发生。在罗斯海以西，海冰的增长可以归因于与IOD效应产生的高压和低压单元之间的冷纬向流相关的负热通量。但在ENSO-IOD联合事件中，这些正、负压异常中心的位置往往出现在海冰带以北，从而减弱了IOD对海冰的影响。
AbstractThis study explores the impact of the Indian Ocean dipole (IOD) on the Southern Hemisphere sea ice variability. Singular value decomposition (SVD) of September–November sea ice concentration and sea surface temperature (SST) anomalies reveals patterns of El Nino–Southern Oscillation (ENSO) in the Pacific and the IOD in the equatorial Indian Ocean. The relative importance of the IOD’s impact on sea ice in the Pacific sector of Antarctica is difficult to assess for two reasons: 1) ENSO generates larger anomalies in the Pacific and Weddell Sea and 2) many of the positive (negative) IODs co-occur with El Nino (La Nina). West of the Ross Sea, sea ice growth can be attributed to the negative heat fluxes associated with cold meridional flow between high and low pressure cells generated by the effects of the IOD. However, the locations of these positive and negative pressure anomaly centers tend to appear north of the sea ice zone during combined ENSO–IOD events, reducing the influence of the IOD on sea i...