| 江淮梅雨异常空间分布型对比分析 |
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| 引用本文： | 姜茹茵.江淮梅雨异常空间分布型对比分析[J].贵州气象,2014(2):8-14. |
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| 作者姓名： | 姜茹茵 |
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| 作者单位： | 山东省招远市气象局,山东招远265400 |
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| 摘 要： | 利用国家气候中心整编的中国160个测站的月降水资料,提取1951—2012年江淮流域26站6、7月份的梅雨量距平场资料进行EOF分析,将梅雨雨型分为北涝南旱型和南涝北旱型。利用NCAR/NCEP再分析资料对两种空间分布的典型年大气环流背景特征进行合成分析,结果表明:北涝南旱年,高纬度鄂霍次克海高压阻塞形势偏强,极涡偏弱,西太平洋副热带高压和南亚高压位置偏北,东亚副热带夏季风偏强,水汽辐合中心偏北;南涝北旱年情形基本相反,高纬度鄂霍次克海高压阻塞形势和极涡偏强,西太平洋副热带高压和200 hPa南亚高压位置偏南,东亚副热带夏季风偏弱,水汽辐合中心偏南。
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| 关 键 词： | 梅雨异常 南(北)涝北(南)旱型 环流异常 |
Changjiang-Huaihe Meiyu abnormal comparative analysis in spatial distribution patterns |
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| JIANG Ru yin.Changjiang-Huaihe Meiyu abnormal comparative analysis in spatial distribution patterns[J].Journal of Guizhou Meteorology,2014(2):8-14. |
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| Authors: | JIANG Ru yin |
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| Institution: | JIANG Ru yin ( Zhaoyuan Meteorological Buearu, Shandong Province, Zhaoyuan 265400) |
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| Abstract: | In this study,we used the precipitation data from NCC to analyze the Meiyu precipitation anomaly. By the method of EOF analysis,we found the second eigenvector mainly show the reversed spatial pattern of the Meiyu precipitation between the south and north area. Based on this result,we defined the types of Meiyu as ＂southern flood and northem drought type（ SFND） ＂and＂northem flood and southern drought type（ NFSD）. ＂We also used the NCAR / NCEP reanalysis data to analyze the atmospheric circulation anomaly during the these two anomalous types. The results show that： during southern flood and northem drought type,the convergence center of water vapor was southerly,the subtropical summer monsoon in Eastern Asia was weaker than usual,the Okhotsk blocking high pressure and the polar vortex is stronger and the lacation of South West Pacific subtropical high and 200 hPa South Asia High was southerly. As for northem flood and southern drought type,the convergence center of water vapor was northerly,the subtropical summer monsoon in Eastern Asia was stronger than usual,the Okhotsk blocking high pressure and the polar vortex is weaker and the location of South West Pacific subtropical high and 200 hPa South Asia High was northerly. |
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| Keywords: | Meiyu abnormality southern（northem） flood and northem（southern） drought atmospheric circulation abnormality |
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