| 近20年华北地区干旱期大气环流异常特征 |
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| 引用本文： | 卫捷,张庆云,陶诗言.近20年华北地区干旱期大气环流异常特征[J].应用气象学报,2003,14(2):140-151. |
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| 作者姓名： | 卫捷 张庆云 陶诗言 |
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| 作者单位： | 中国科学院大气物理研究所, 北京 100029 |
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| 基金项目： | 中国科学院资源环境领域知识创新工程重要方向项目 (编号KZCX2 2 0 3)，“国家重点基础研究发展规划”项目 (编号G19980 4 90 0 )第一部分的资助 |
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| 摘 要： | 利用NCAR/NCEP再分析资料和中国气象局整编的中国160站气温、降水月平均资料, 计算并分析了1951年1月-2000年10月中国华北地区Palmer drought severity index (PDSI)。研究表明:近50年来华北干旱有显著的年际和年代际变化。从20世纪80年代以来, 华北出现了持续性严重干旱现象; 另外, 华北地区干旱持续时间一般都在两年以上。华北夏季典型干旱年的前期 (冬季和春季) 及同期环流特征是:北半球中高纬度500hPa高度距平场出现EU型遥相关分布, 华北地区长期处于大陆暖高压控制下。
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| 关 键 词： | 华北 干旱 大气环流异常特征 EU遥相关型 |
| 收稿时间： | 2002-01-08 |
| 修稿时间： | 2002年1月8日 |
Characteristics of Atmospheric Circulation Anomalies During Persistent Droughts in North China for Last Two Decades |
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| Wei Jie,Zhang Qingyun,Tao Shiyan.Characteristics of Atmospheric Circulation Anomalies During Persistent Droughts in North China for Last Two Decades[J].Quarterly Journal of Applied Meteorology,2003,14(2):140-151. |
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| Authors: | Wei Jie Zhang Qingyun Tao Shiyan |
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| Institution: | Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 |
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| Abstract: | The persistent droughts during the last two decades in North China are studied. The main results are as follows: (1) The Palmer Drought Severity Index (PDSI) shows that there is inter-annual variation in droughts in North China. The inter-decadal variation is even more remarkable. Before the mid-1970s, there was wet summer climate, while since 1970, there were more drought years in North China. Moreover, the most severe droughts happened after the 1980s. (2) Summer droughts in North China are the consequence of persistent anomalous circulation over the Eurasia. The main features of the anomalous circulation include that there is height anomaly in the region of 55o to 65oN, 60 o to 135 o E and that there was EU teleconnection and it is the main type of atmospheric circulation anomalies that causes the persistent summer droughts in North China. (3) During the summer drought years, there is continuity in the distribution of the 500 hPa height anomaly field from winter to summer. (4) The anomaly of the general atmospheric circulation during droughts in North China are not local phenomena, but the responses to the Northern Hemisphere general atmospheric circulation anomaly. |
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| Keywords: | North China Summer drought Atmospheric circulation anomalies EU teleconnection |
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