The semi‐annual oscillation and Antarctic climate. Part 4: a note on sea ice cover in the Amundsen and Bellingshausen Seas
The semi‐annual oscillation and Antarctic climate. Part 4: a note on sea ice cover in the Amundsen and Bellingshausen Seas
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半年振荡和南极气候第 4 部分：关于阿蒙森海和别林斯高晋海海冰覆盖的说明。
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
M. Broeke
中科院分区：
文献类型：
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作者：
M. Broeke
位于南极半岛西海岸的法拉第的气候受到阿蒙森海和别林斯豪森海（ABS）海冰覆盖范围的强烈影响。ABS海冰覆盖与法拉第年平均气温、风速、云量呈负相关，与降水频率呈正相关。半年涛动（SAO）振幅与冬季ABS海冰范围的耦合表现为：在SAO不发达的年份，4 - 7月的环极压槽向西北移动受到抑制，导致整个冬季ABS海冰负异常持续。20世纪70年代末以来SAO的减弱导致了该地区年平均风速和云量的增加，这可能是导致ABS海冰长期减少的原因之一；风速和云量的年周期变化导致4 - 7月海冰增长减少，导致ABS冬季海冰负异常，区域增温增强。
The climate of Faraday, situated at the west coast of the Antarctic Peninsula (AP), is strongly influenced by the extent of sea ice cover in the Amundsen and Bellingshausen Seas (ABS). ABS sea ice cover is negatively correlated with Faraday annual mean temperature, wind speed and cloudiness, while a positive correlation was found with precipitation frequency. The amplitude of the semi-annual oscillation (SAO) and wintertime ABS sea ice extent are coupled as follows: in years with a poorly-developed SAO, the northwestward migration of the circumpolar pressure trough from April to July is suppressed, causing negative sea ice anomalies in the ABS that persist throughout the winter. The weakening of the SAO since the late 1970s has led to: an increase of annual mean wind speed and cloudiness in the region, one of the possible causes for the onset of the long-term ABS sea ice cover decrease; and changes in the annual cycles of wind speed and cloudiness such that sea ice growth in the period April-July has decreased, causing negative winter sea ice anomalies in the ABS and enhanced regional warming.