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气象:2010,36(11):26-31
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中国东部地区夏季高温南北不均匀分布特征分析
(浙江省桐乡市气象局, 桐乡 314500)
Analysis of the Meridional Heterogeneous Distribution of Summer Heat Wave over Eastern China
(Tongxiang Meteorological Office of Zhejiang Province, Tongxiang 314500)
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投稿时间:2009-02-22    修订日期:2010-02-22
中文摘要: 对1958—2007年我国东部地区102个国家基本站盛夏(6—8月)高温日数进行统计分析,发现有明显的不均匀分布特征。由EOF分析可以看到第二特征向量呈南北反位相分布,通过对其时间序列的分析,发现它极好地反映了高温日数南北方向不均匀分布的年际变化特征。利用月平均海温资料(ERSST)和NCEP再分析月平均资料对高温日数南北分布异常典型年份的海气背景特征进行研究分析发现:在高温区偏南年份500 hPa位势高度场长江以南为正距平,朝鲜半岛、日本为负距平,同时在20°~35°N上空自南而北存在有一个增强的逆时针垂直环流,对于高温区偏北年份情况则基本相反。相关分析发现这种高温日数南北分布变化与前期12月份低纬度地区500 hPa位势高度场和5月份印度洋海温有很好的相关性。
Abstract:With the analysis on the high temperature days(≥35.0 ℃) from 102 observational stations over eastern China (25°-35°N,110°-122°E) in 1958-2007, it is found that the high temperature weather in eastern China has the same rate of change in most years, but some years it has a contrary distribution in south and north, and this distribution has no relation with the high temperature intensity. Using the NCEP/NCAR monthly mean reanalysis data, the typical year circulation backgrounds are analyzed. The results show: in the anomalous years that the heat wave mainly concentrates in south, it has a “positive negative” pattern of geopotential height anomaly in 500 hPa from south to north in East Asian,and there is a vertical counterclockwise cycle from north to south in 25°-35°N compared with normal years. In the years that the heat wave mainly concentrates in north, it is opposite. The EOF analysis of the numbers of annual high temperature days reveals that the second leading mode respectively indicate the heat wave’s contrary distribution in meridional direction and its time series can reflect the intensity of this deviation as an index. The correlation analyses denote that the variation of this distribution is well related to the December 500 hPa geopotential height anomaly and the SST anomaly in the tropical Indian Ocean in May last year. It is also related to the many atmospheric circulation indexes of spring and precedent winter. 
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朱周平,钱炳强,2010.中国东部地区夏季高温南北不均匀分布特征分析[J].气象,36(11):26-31.
ZHU Zhouping,QIAN Bingqiang,2010.Analysis of the Meridional Heterogeneous Distribution of Summer Heat Wave over Eastern China[J].Meteor Mon,36(11):26-31.