Palmer干旱指数在华北干旱分析中的应用
收稿日期: 2003-03-15
修回日期: 2003-06-11
网络出版日期: 2003-12-25
基金资助
国家重点基础研究发展规划项目"我国生存环境演变和北方干旱化趋势预测研究" (G1999043405), 中国科学院知识创新工程重要方向项目"亚洲季风区海-陆-气相互作用对我国气候变化的影响" (ZKCX2-SW-210)
Analysis of Drought in Northern China Based on the Palmer Severity Drought Index
Received date: 2003-03-15
Revised date: 2003-06-11
Online published: 2003-12-25
Supported by
National Key Planning Development for Basic Research, No.G199904305; Impacts of Ocean-Land-Atmosphere Interactions over theEast Asian Monsoon Region on the Climate in China
利用中国气象局整编的1951年1月~2000年10月中国160站气温、降水月平均资料，计算了1951年1月~2000年10月我国160站修正的Palmer drought severity index (PDSI)。PDSI指数对我国的干旱和洪涝过程都有很好的指示意义。华北地区干旱持续性非常强，持续时间一般都在两年以上。华北地区干旱不但年际变化大，年代际变化也显著，近50年来华北干旱主要发生在20世纪70年代以后，且干旱强度有所增加。夏季伴随干旱过程常常出现高温酷暑天气。
关键词： Palmer干旱指数; 夏季干旱; 华北
卫捷,陶诗言,张庆云 . Palmer干旱指数在华北干旱分析中的应用[J]. 地理学报, 2003 , 58(7s) : 91 -99 . DOI: 10.11821/xb20037s011
Drought during the period 1999-2000 in North China is studied by using monthly mean temperature and precipitation data from 160 stations covering January 1951 to October 2000. The revised Palmer drought severity index (PDSI) of the 160 stations covering the same period was also calculated. It is found that the protracted drought was a manifestation of an abnormal form of general circulation. The PDSI can characterize the temporal and spatial distributions of remarkable droughts and floods in China. During 1999-2000 there was a persistent negative PDSI in North China, the PDSI also shows that there is a marked interannual and interdecadal variation of drought in North China. From 1950-1970 there is a wet summer climate, while since 1970 there have been more drought years in North China.
Key words： Palmer drought severity index; summer drought; East China
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