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利用空间均匀网格对中国夏季降水异常区域特性的初步分析
引用本文:王晓春,吴国雄.利用空间均匀网格对中国夏季降水异常区域特性的初步分析[J].气象学报,1996,54(3):324-332.
作者姓名:王晓春  吴国雄
作者单位:大气科学和地球流体力学数值模拟国家重点实验室,中国科学院大气物理所
摘    要:用方差极大正交转动EOF(Varimax EOF)及点相关图法分析了夏季总降水(6、7、8月降水之和)及逐月降水的区域特性。使用的资料为全国范围47个5°×5°经纬度网格上的降水资料,分析时段为1959—1994年。分析结果表明,由于采用了空间均匀的格同资料,本分析除进一步证实了中国东部地区降水异常的区域特性外,也揭示了西部地区降水异常的区域特性及沿长江流域东西方向上降水异常的相互关系。夏季总降水异常最显著的区域特性是江淮流域与河套及华南反相关。另外沿长江流域,四川盆地的降水异常与青藏高原东部及江淮流域的降水异常也存在着反相关联系。西部地区的区域特性为青藏高原中东部南北两侧为负相关,并且青藏高原中东部南侧的降水异常与华北东部及东北南部为正相关。上述的空间模都有准2—3a及10a左右的周期。逐月降水的分析表明,6月份,江淮流域、华北东部及东北大部分地区为正相关。7月,河套地区与江淮流域的降水异常呈现一定的负相关联系,8月份降水异常的区域特性与夏季总降水异常的区域特性极其一致。

关 键 词:方差极大正交转动EOF(Varimax  EOF)分析,降水异常区域特性,夏季总降水,逐月降水
收稿时间:1994/12/23 0:00:00
修稿时间:1995/10/13 0:00:00

REGIONAL CHARACTERISTICS OF SUMMER PRECIPITATION ANOMALIES OVER CHINA IDENTIFIED IN A SPATIAL UNIFORM NETWORK
Wang Xiaochun and Wu Guoxiong.REGIONAL CHARACTERISTICS OF SUMMER PRECIPITATION ANOMALIES OVER CHINA IDENTIFIED IN A SPATIAL UNIFORM NETWORK[J].Acta Meteorologica Sinica,1996,54(3):324-332.
Authors:Wang Xiaochun and Wu Guoxiong
Affiliation:LASG, Institute of Atmospheric Physics, Academia sinica, Beijing, 100080;LASG, Institute of Atmospheric Physics, Academia sinica, Beijing, 100080
Abstract:The regional characteristic of precipitation anomalies of total summer precipitation (total precipitation of Jule July and Aug.) and monthly precipitation are analyzed by using the results of Varimax EOF and correlation analysis. The data set used is the grid point precipitation over a (5°lat× 5°lon) network in China in the period of 1954 to 1994. The analysis of total precipitation shows that the most significant regional characteristic is the existence of negative correlation in precipitation anomalies between the low-reaches of Yangtse River and the Huaihe River valley (LRYH region) and the middle-reaches of the Yollow River valley (MRY region),and between the LRYH region and South China. The precipitation anomaly over the Sichuan Basin is negatively correlated with that over eastern part of Qinghai Xizang Plateau and that over the LRYH region. The regional characteristics of summer precipitation anomalies in the western China is that there exists negative correlation between the summer precipitation anomalies over the sourthern part of the central and eastern Qinghai Xizang Plateau and that over its northern part. There also exists positive correlation between the sourthern part of eastern Qinghai Xizang Plateau and the eastern part of North China and the southern part of Northeast China. The above spatial correlation modes have significant periods of about 3 years and 10 years. The analyses of the monthly precipitation show that,in Jule,there exists positive correlation among the precipitation anomalies over the LRYH region,the eastern part of North China and the Northeast China. In July,the precipitation in the MRY region and the LRYH regions are negatively correlated. The regional characteristicss of precipitation anomalies in Aug. is very similar to that of the total summer precipitation anomalies.
Keywords:Varimax EOF analysis  Regional characteristic of summer precipitation anomalies  Total summer precipitation  Monthly precipitation  
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