| 奇异值分解和奇异交叉谱分析方法在华北夏季降水诊断中的应用 |
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| 引用本文： | 尤凤春,丁裕国,周煜,史印山.奇异值分解和奇异交叉谱分析方法在华北夏季降水诊断中的应用[J].应用气象学报,2003,14(2):176-187. |
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| 作者姓名： | 尤凤春 丁裕国 周煜 史印山 |
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| 作者单位： | 1.河北省气象台, 石家庄 050021 |
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| 摘 要： | 利用1965~2000年华北5省市及相邻省73个地面观测站逐月平均降水场及北半球500 hPa高度场、北太平洋海温场资料, 采用奇异值分解 (SVD)、奇异交叉谱 (SCSA) 分析方法, 将华北夏季降水场分别与1月北半球500 hPa高度场、冬季北太平洋海温场进行了诊断分析, 得出奇异向量分布型及相互作用的耦合周期信号。在对前4对奇异向量的分析中发现, 华北夏季降水全区域为正距平时与1月北半球500 hPa高度场PNA遥相关型关系非常密切。ENSO对华北夏季降水的影响确实存在, 但华北夏季降水全区域为正距平时与冬季北太平洋ENSO关系并不明显。同时还找出了华北降水与北半球500 hPa高度、北太平洋海温场相互作用的关键区。在华北各型降水与高度场、海温场关键区相互作用的耦合周期中, 前者以准2~7年振荡为主; 后者则周期较长, 最短周期仍为准2年振荡, 最长周期为准10~11年振荡。以上结论为进一步研究华北夏季降水短期气候预测方法, 提供了参考依据。
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| 关 键 词： | 华北 夏季降水 奇异值分解 奇异交叉谱 |
| 收稿时间： | 2002-02-02 |
| 修稿时间： | 2002年2月2日 |
Applicability of Singular Value Decomposition and Singular Cross-spectrum to Diagnose of Rainfall in North China |
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| You Fengchun,Ding Yuguo,Zhou Yu,Shi Yinshan.Applicability of Singular Value Decomposition and Singular Cross-spectrum to Diagnose of Rainfall in North China[J].Quarterly Journal of Applied Meteorology,2003,14(2):176-187. |
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| Authors: | You Fengchun Ding Yuguo Zhou Yu Shi Yinshan |
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| Institution: | 1.Hebei Meteorological Observatory, S hijiaz huang 0500212.Nanjing I nstitute of Meteorology, Nanjing 2100443.China Meteorological Administration, Beijing 100081 |
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| Abstract: | Based on the monthly mean precipitation data of 1965-2000 from 73 meteorological stations in North China, the diagnostic analyses of the January Northern Hemisphere 500 hPa height field and the winter Northern Pacific Ocean sea surface temperature (SST) field associated with summer precipitation over North China are made by singular value decomposition (SVD) and singular cross spectrum analysis (SCSA) methods.The results show that there is a close PNA teleconnection pat tern between 500 hPa height field and summer North China precipitation when the summer precipitation anomaly is positive.ENSO has a definite impact on summer North China precipitation, but there is not no table relation between summer precipitation and winter ENSO in the Northern Pacific Ocean when the precipitation anomaly is positive.The key regions of interaction between North China precipitation and Northern Hemisphere 500 hPa height field and that between precipitation and SST are further found.For the interaction between North China precipitation and 500 hPa height field, the dominated coupled oscillation periods are quasi-two years and quasi-seven years.For the interaction between North China precipitation and SST, the periods are longer———the shortest is the quasi-2-year oscillation and the longest is 10-or 11-year oscillation. |
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| Keywords: | North China Summer precipitation Singular value decomposition Singular cross spectrum |
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