The spatial and temporal distribution of the stratospheric sudden warming
The spatial and temporal distribution of the stratospheric sudden warming
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发表时间：
2006
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通讯作者：
Chen Yue-juan
中科院分区：
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作者：
Chen Yue-juan
利用1950~2003年NCEP逐日平均资料，分析了平流层突然增暖的特征。结果表明，54年来，北半球平流层突然增温频繁，共发生69次，平均每年发生1次以上，有的年份甚至出现2~3次；北半球平流层突然增温中心位置随高度变化，在低层(近16公里)，主要在北美洲北端至北极圈，高层(近30公里)主要位于欧亚大陆以北至北极；北半球的SSW通常首先出现在欧亚大陆以北近30公里处，然后由高层向低层扩展输送，西半球增温中心逐渐向北美北部移动；在SSW过程中，平流层温度和环流的变化可以影响对流层，从而导致对流层温度和环流的变化。除了北半球的SSW外，还分析了2002年9月南半球平流层的主要增温。这次SSW在南半球和北半球的特征有所不同：在低层(近16公里)，增温中心出现在东半球的南端，而在高层，它位于西半球的南端。
The daily averaged NCEP data from 1950 to 2003 were used to analyze the characteristics of Stratospheric Sudden Warming(SSW).The results show that SSW in the Northern Hemisphere appeared so often that there were 69 SSW events during the 54 years and that they occurred more than once a year on the average,even twice or thrice in some years;the location of the warming center of SSW in the Northern Hemisphere changed with height at the lower level(near 16 km),mostly over the northern tip of North America to the Arctic in the western hemisphere;at the upper level(near 30km),it was mostly located over the north of Eurasia to the Arctic;SSW in the North Hemisphere usually occurred first near 30 km over the north of Eurasia,and then extended and transported from upper levels to lower levels with the warming center shifting gradually to the north of North America in the Western Hemisphere;during SSW,the change in temperature and circulation in the Stratosphere can affect the Troposphere,and lead to the change in temperature and circulation in the Troposphere.Besides the SSW in the Northern Hemisphere,the major warming that happened in the Stratosphere of the Southern Hemisphere in September 2002 was also analyzed.The characteristics of this SSW in the Southern Hemisphere differed somewhat from that of the North Hemisphere: at the lower levels(near 16 km),the warming center appeared over the southern tip of Eastern hemisphere,and at the upper levels,it was located over the southern tip of the western hemisphere.