| 北半球冬季阻塞环流与NAO之间的关系 |
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| 引用本文： | 万寒,罗德海. 北半球冬季阻塞环流与NAO之间的关系[J]. 热带气象学报, 2009, 25(5): 615-620. DOI: 10.3969/j.issn.1004-4965.2009.05.013 |
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| 作者姓名： | 万寒 罗德海 |
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| 作者单位： | 1. 温州市气象局,浙江,温州,325027;中国海洋大学海洋环境学院气象系,山东,青岛,266003
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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| 基金项目： | 国家自然科学基金资助项目(4057016)资助 |
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| 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。
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| 关 键 词： | 阻塞环流；北大西洋涛动；大气斜压性 |
THE RELATIONSHIP BETWEEN WINTERTIME BLOCKINGS IN THE NORTH HEMISPHERE AND NORTH ATLANTIC OSCILLATION |
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| WAN Han,,LUO De-hai. THE RELATIONSHIP BETWEEN WINTERTIME BLOCKINGS IN THE NORTH HEMISPHERE AND NORTH ATLANTIC OSCILLATION[J]. Journal of Tropical Meteorology, 2009, 25(5): 615-620. DOI: 10.3969/j.issn.1004-4965.2009.05.013 |
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| Authors: | WAN Han LUO De-hai |
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| Affiliation: | 1. Wenzhou Meteorological Bureau of Zhejiang Province;Wenzhou 325027;China;2. Department of Meteorology;School of Ocean Environment;Ocean University of China;Qingdao 266003;China |
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| Abstract: | First strong NAO years are selected according to the annual variation of North Atlantic Oscillation (NAO) index by Oman. Then the statistical characteristics of wintertime blockings during strong NAO years in the Northern Hemisphere are investigated based on daily mean NCEP/NCAR reanalysis datum. After that, by calculating the climatological values of baroclinicity in wintertime in strong NAO years, the composite latitudinal variation of average baroclinicity of the troposphere in North Atlantic Ocean, Euro... |
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