北半球冬季阻塞环流与NAO之间的关系

万寒1,2,罗德海2

北半球冬季阻塞环流与NAO之间的关系

万寒1,2,罗德海2

温州市气象局,浙江温州 325027;2. 中国海洋大学海洋环境学院气象系,山东青岛 266003

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摘要

摘要: 首先根据Oman关于北大西洋涛动（NAO）指数冬季平均值的年际变化挑选出强NAO年，然后利用NCEP/NCAR逐日再分析资料，分析了在强NAO年北半球冬季阻塞发生频率和生命期的统计特征，最后通过对强NAO年大气斜压性进行冬季气候平均，合成得到了三个区域（北大西洋、欧洲和北太平洋）对流层平均大气斜压性随纬度的分布情况。结果发现：北大西洋在NAO负位相时下游阻塞发生频率更高，持续时间更长；NAO正位相则有利于欧洲长生命阻塞的发生和维持；北太平洋阻塞在NAO负位相发生频率明显更高，在NAO正位相阻塞的平均持续时间更长。大气斜压性随纬度的分布与阻塞的发生有较好的对应关系，过强的大气斜压性会抑制阻塞的发生。
- 阻塞环流 /
- 北大西洋涛动 /
- 大气斜压性

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