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首页> 外文期刊>Annals of Glaciology >Spatial fields of Antarctic sea-ice concentration anomalies for summer-autumn and their relationship to Southern Hemisphere atmospheric circulation during the period 1979-2009
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Spatial fields of Antarctic sea-ice concentration anomalies for summer-autumn and their relationship to Southern Hemisphere atmospheric circulation during the period 1979-2009

机译：1979-2009年夏季-夏季南极海冰浓度异常的空间场及其与南半球大气环流的关系

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摘要

Summer autumn monthly sea-ice concentration anomaly (SICA) fields in Antarctica obtained from satellite data for the period 1979-2009 were analysed with Varimax-rotated T-mode principal component analysis (PCA). The first three PCA scores described the SICA spatial behaviour and explained 38.07% of the total variance. The related atmospheric circulation characteristics were analysed using 850 hPa height and surface air-temperature anomalies for the months clustered by the corresponding SICA composites, which were based on PCA loadings above a +/- 0.3 threshold. The principal characteristics of SICA can be seen between the Ross and Weddell Seas, areas that remained ice-covered during the analysis period. Elsewhere around Antarctica, small distinct characteristics occur mostly in embayments. The leading summer-autumn SICA pattern shows a structure with two centres of equal sign located one over the Weddell and the other over the Ross Sea-southwest Pacific Ocean sector and a centre of opposite sign over the Bellingshausen and Amundsen Seas. The second SICA pattern is represented by a dipole over the Weddell Sea as a result of an increase (decrease) in sea-ice concentration in the northern sector (positive phase) and a decrease (increase) in the southern region, together with a positive (negative) centre over the Ross and Amundsen Seas. The latter pattern is characterized by equal-sign anomalies on both sides of the Antarctic Peninsula and opposite-sign centres all around Antarctica with the highest intensity over the Ross Sea.
机译：利用Varimax旋转T型主成分分析（PCA）分析了1979-2009年期间从南极洲获得的夏季秋季每月海冰浓度异常（SICA）场。前三个PCA得分描述了SICA空间行为，并解释了总方差的38.07％。使用对应的SICA复合材料聚类的月份中的850 hPa高度和表面气温异常，分析了相关的大气环流特征，这些异常是基于+/- 0.3阈值以上的PCA载荷得出的。 SICA的主要特征可以在罗斯和韦德尔海之间看到，在分析期间这些区域仍然被冰覆盖。在南极洲附近的其他地方，小的明显特征主要出现在隔离带中。夏季-秋季的主导SICA模式显示了一个结构，其中两个等号中心位于Weddell上，另一个位于罗斯海西南太平洋区域，而另一个中心则位于Bellingshausen和Amundsen Seas上。第二个SICA模式是由于北部地区（正相）的海冰浓度增加（减少），南部地区（正相）的海冰浓度增加（减少）而在Weddell海上形成了偶极子，以及正值。 （负）中心位于罗斯和阿蒙森海。后一种模式的特征是南极半岛两侧的等号异常和南极各地的对号中心，其罗斯海强度最高。

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