| 北半球大气环流异常与广西夏季高温天气 |
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| 引用本文： | 赵金彪,张健挺,陈丽娜.北半球大气环流异常与广西夏季高温天气[J].气象科技,2006,34(2):157-161. |
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| 作者姓名： | 赵金彪 张健挺 陈丽娜 |
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| 作者单位： | 广西壮族自治区河池市气象局,河池,547000 |
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| 摘 要： | 利用1951~2003年北半球500 hPa月平均高度场资料,对广西多高温年份和少高温年份的大尺度环流场进行对比分析,发现多高温年和少高温年500 hPa位势高度距平场差异明显,主要表现在:北太平洋阿留申群岛到副热带地区在冬春季和前汛期都呈现相反的南北距平分布结构;盛夏,多高温年在乌拉尔山至贝加尔湖地区及孟加拉湾至我国西南地区是正距平区,而少高温年在上述地区为负距平中心。典型相关分析表明,7~8月500 hPa高度场与前期1月、4~6月的高度场有密切的联系,高空槽脊的强弱分布及西太平洋副高等大尺度天气系统的变化本身具有一定的内相关,从而揭示了高温天气形成的大尺度环流变化的一些事实。
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| 关 键 词： | 高温 大气环流 典型相关 |
| 收稿时间： | 2004-11-25 |
| 修稿时间： | 2005-04-15 |
General Circulation over Northern Hemisphere and High Temperature over Guangxi in Summer |
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| Zhao Jinbiao,Zhang Jianting,Chen Lina.General Circulation over Northern Hemisphere and High Temperature over Guangxi in Summer[J].Meteorological Science and Technology,2006,34(2):157-161. |
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| Authors: | Zhao Jinbiao Zhang Jianting Chen Lina |
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| Institution: | Heehi Meteorological Bureau, Guangxi Autonomous Region, Hechi 547000 |
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| Abstract: | By means of the monthly mean height data at 500 hPa from 1951 to 2003 over the Northern Hemisphere,a contrast analysis is made of the difference in the large-scale atmospheric circulation between the years with more-than-normal high temperature days and the years with less-than-normal high temperature days in Guangxi Autcnomous Region.It is found that the anomalous geopotential height fields at 500 hPa between more-than-normal and less-than-normal high temperature years are evidently different.From the Aleutian Islands in the North Pacific Ocean to the subtropical zone,there exist contrary distributions of the north-south anomaly in spring, winter,and in the pre-flood period.In midsummer,the areas from Ural to Baikal and from the Bay of Bengal to the southwestern China have positive anomaly in more-than-normal years,and have negative anomaly in less-than-normal high temperature years.The canonical correlation analysis indicates that there is close relation between the geopotential height field at 500 hPa in midsummer(July to August) and those of previous January and April to June.There is autocorrelation in the intencity distribution of the upper trough and ridge and the change of large-scale weather systems such as the West Pacific Subtropical High,which can explain the fact that the anomalies of the large-scale circulation result in the formation of high temperature weather. |
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| Keywords: | high temperature atmospheric circulation contrast analysis canonical correlation analyzing |
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