| 夏季北半球极涡与南亚高压东西振荡的关系 |
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| 引用本文： | 陈永仁,李跃清.夏季北半球极涡与南亚高压东西振荡的关系[J].高原气象,2007,26(5):1067-1076. |
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| 作者姓名： | 陈永仁 李跃清 |
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| 作者单位： | 中国气象局,成都高原气象研究所,四川,成都,610071;四川省气象台,四川m,成都,610071;云南大学,大气科学系,云南,昆明,650091;中国气象局,成都高原气象研究所,四川,成都,610071;四川省气象台,四川,成都,610071 |
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| 基金项目： | 中国气象局成都高原气象研究所开放实验室基金，江苏省气象灾害实验室项目(KLME050210)共同资助 |
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| 摘 要： | 利用合成分析、交叉谱和Morlet小波分析,讨论了夏季100 hPa极涡面积指数与南亚高压东西振荡间的关系。结果表明:极涡与南亚高压东伸指数之间存在显著的反相关关系,当极涡面积扩张时,南亚高压易偏西;当极涡面积收缩时,南亚高压则易东伸。交叉谱的结果也表明:二者在不同波数上,也具有显著关系,在7.5年及3年周期振动上,二者位相相差较小。同时,在南亚高压异常偏东及偏西年份,高度场、流场、温度场均有不同的配置形式,这在一定程度上反映了南亚高压偏东及偏西年不同的环流特征。
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| 关 键 词： | 北半球 极涡 南亚高压 东西振荡 |
| 文章编号： | 1000-0534（2007）05-1067-10 |
| 修稿时间： | 2006-06-30 |
Relationships between Polar Vortex and Oscillation of South Asia High in East and West Directions |
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| CHEN Yong-ren,LI Yue-qing.Relationships between Polar Vortex and Oscillation of South Asia High in East and West Directions[J].Plateau Meteorology,2007,26(5):1067-1076. |
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| Authors: | CHEN Yong-ren LI Yue-qing |
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| Institution: | 1.Chengdu Institute of Plateau Meteorology;China Meteorological Administration;Chengdu 610071;China;2.Sichuan Province Observatory;Chengdu 610071;China;3.The Department of Atmosphere;Yunnan University;Kunming 650091;China |
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| Abstract: | The relationships between Polar Vortex and the Oscillation of South Asia High(SAH) in east-and west-directions at 100 hPa levels are mainly studied by using composition analyses cross spectrum analysis,Morlet wavelet transform etc.The results showed that the indexes of Polar Vortex are positively correlated with the Oscillation of South Asia High in east-and west-directions.While the area of Polar Vortex became weak,the South Asia High displayed East deviation anomaly,and vice versa.On the other hand,both the polar vortex and SAH had similar interannual period characters.The results of spectrum analyses showed that they have the significant periods at 7.5 and 3-years.Meanwhile,the composed fields of geopotional height,stream line and temperature had dramatic variations in far east-and west-years of the SAH,It shows the different characters of atmospheric circulation in far east-and west-years of SAH. |
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| Keywords: | Northern Hemisphere Polar vortex South Asia High(SAH) Oscillation of SAH position in east-and west-directions |
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