Received date: 2003-02-25
Revised date: 2003-06-17
Online published: 2003-12-25
Supported by
The Ministry of Science and Technology, No.G1999043405; No.2001BA611B-01
Based on China's monthly precipitation data of 629 stations during 1950-2000, we calculated Z indices and separated them into seven Dryness and Wetness grades. Furthermore, a drought area index was proposed to study changes of drought extent. The results revealed that the different grades of droughts all show expanding trends in northern China's main agricultural area. Moreover, the area coverage of droughts in different seasons and different regions displayed different trends.
Key words： northern China; drought coverage; trend
WANG Zhiwei, ZHAI Panmao . Climate Change in Drought over Northern China during 1950-2000[J]. Acta Geographica Sinica, 2003 , 58(7s) : 61 -68 . DOI: 10.11821/xb20037s007
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