ENSO年东亚夏季风异常对中国江、淮流域夏季降水的影响

赵亮; 邹力; 王成林; 尹洪波

ENSO年东亚夏季风异常对中国江、淮流域夏季降水的影响

1.
中国气象局气候研究开放实验室, 北京, 100081;中国气象科学研究院, 北京, 100081;解放军理工大学气象学院, 江苏, 南京, 211101
2.
解放军理工大学气象学院, 江苏, 南京, 211101

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出版历程
- 收稿日期: 2004-07-06
- 修回日期: 2006-05-09

IMPACTS OF THE EAST ASIAN SUMMER MONSOON ANOMALY DURING THE ENSO EVENT PERIOD ON THE SUMMER PRECIPITATION IN THE LOWER-MIDDLE REACHES OF THE YANGTZE RIVER AND HUAIHE RIVER VALLEY

1.
Laboratory for Climate Studies, China Meteorological Administration, Beijing 100081, China;Chinese Academy of Meteorological Sciences, Beijing 100081, China;Institute of Meteorology, PLA University of Science and Technology, Nanjing 211101, China
2.
Institute of Meteorology, PLA University of Science and Technology, Nanjing 211101, China

摘要

摘要: 利用Niño3指数,把ENSO循环不同位相的夏季划分为4类并进行聚类分析,发现ElNiño发展期和La Niña衰减期可以聚为一类,其夏季淮河流域降水往往偏多,长江中下游降水偏少;El Niño衰减期和La Niña发展期可以聚为一类,其夏季长江中下游地区降水往往偏多,淮河流域降水往往偏少。而后对这两大类中的年份分别聚类和合成分析。结果发现,这次聚类的结果反映了强弱夏季风对江、淮地区降水的影响。这一方面表明ENSO循环的同一位相既可能对应强东亚夏季风也可能对应弱夏季风,另一方面表明ENSO循环通过影响东亚夏季风环流异常的范围而使雨带位置发生变化,东亚夏季风强弱主要使雨量多少发生变化。
- 东亚夏季风 /
- ElNiñ /
- o /
- LaNiñ /
- a /
- 聚类分析
Abstract: By using Niño 3 index,the summers during different phases of the ENSO cycle are divided into four types.Then based on the summer rainfall data of the lower-middle reaches of the Yangtze River and the Huaihe River valleys and with the cluster analysis method,we find that the developing phase of El Niño and the decaying phase of La Niña belong to the same type,and in corresponding summers the rainfall is often above normal in the Huaihe River valley and below normal in the lower-middle reaches of the Yangtze River.And the decaying phase of El Niño and the developing phase of La Niña belong to the same type,and in corresponding summers the rainfall is often above normal in the lower-middle reaches of the Yangtze River and below normal in the Huaihe River Valley.Then the summers of the two types are investigated through cluster analysis and composite analysis,and the results show different influence of strong and weak summer monsoon on the summer precipitation in these two regions.On the one hand,it indicates that the same phase of the ENSO cycle possibly matches with strong summer monsoons,possibly also matches with weak summer monsoons.On the other hand,it indicates that the ENSO cycle enables the rainband to change position by influencing the range of the East Asian summer monsoon anomaly,and the strength of the East Asian summer monsoon mainly changes the rainfall.
- East Asian summer monsoon /
- El Niñ /
- o /
- La Niñ /
- a /
- cluster analysis

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参考文献(13)

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