| 北半球夏季５００hPa候平均高度场异常持续性的分析 |
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| 引用本文： | 江剑民,钱传海.北半球夏季５００hPa候平均高度场异常持续性的分析[J].大气科学,1994,18(2):200-206. |
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| 作者姓名： | 江剑民 钱传海 |
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| 作者单位： | 北京气象学院,北京 100081 |
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| 基金项目： | 本文得到国家自然科学基金项目的部分资助 |
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| 摘 要： | 本文应用环流持续性异常判据和旋转主分量分析方法，对１９５１—１９８６年间夏季北半球５００hPa逐候平均高度场进行了计算分析，探讨夏季持续性环流异常的地理分布及持续期的基本特征。结果表明:前１１项旋转主分量的主要高荷载中心，与持续异常的高频数中心或其邻近区域大都基本吻合；候平均环流异常的持续性略高于马尔柯夫过程。但某些区域季节性环流异常及多年趋势性环流异常，通常是由某些环流系统或作用中心多次替换、反复出现的持续性异常所组成的。夏季副热带系统是这类异常的重要组成部分。
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| 关 键 词： | 环流异常 持续期 旋转主分量分析 |
An Analysis of Persistence of 500 hPa Pentad Mean Height Anomalies for the Northern Hemisphere Summer |
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| Jiang Jianmin and Qian Chuanhai.An Analysis of Persistence of 500 hPa Pentad Mean Height Anomalies for the Northern Hemisphere Summer[J].Chinese Journal of Atmospheric Sciences,1994,18(2):200-206. |
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| Authors: | Jiang Jianmin and Qian Chuanhai |
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| Abstract: | Both of the persistent anomaly criterion and the Rotated Principal Component (RPC) analysis were applied to 500 hPa pentad mean height data for the Northern Hemisphere Summer during 1951-1986 to diagnose the characteristics of geographical distribution and duration of persistent anom-alies of the Northern Hemisphere summertime circulation. The results show that the localities of high-loading centers of the first 11 RPCs basically coincide with those of the high frequency regions where the persistent anomalies occur. The persistence of pentad mean circulation anomalies is little higher than the Marckov Chain, but some seasonal abnormalities often comprise reoccurrences of the persistent anomalies with short breaks, and the subtropic systems are important components of the persistent anomalies for the Summertime. |
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| Keywords: | persistence atmospheric circulation anomaly rotated principal component analysis |
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