Ranking Regional Drought Events in China for 1960--2009 |
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| Authors: | QIAN Weihong SHAN Xiaolong and ZHU Yafen |
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| Institution: | Monsoon and Environment Research Group, School of Physics, Peking University, Beijing 100871,Monsoon and Environment Research Group, School of Physics, Peking University, Beijing 100871,Monsoon and Environment Research Group, School of Physics, Peking University, Beijing 100871 |
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| Abstract: | The spatiotemporal variations of the site and regional droughts in China
during 1960--2009 were analyzed by applying a daily composite-drought index
(CDI) to 722 stations in mainland China. Droughts frequently happened in a
zone extended from Southwest China to the Yellow River, North China, and the
southwestern part of Northeast China, with two centers of high frequency in
North China and Southwest China. In Southwest and South China, droughts tend
to happen during the winter. In North China and along the Yellow River,
droughts mainly occur during the winter and during May--June. During the
past 50 years, the geographical distribution of site drought events showed
high frequencies (0.9--1.3 times per year) in the upper Yellow River basin
and North China, comparing with moderate frequencies (0.6--0.9 times per
year) in Southwest China and the southwestern part of Northeast China and
with lower frequencies over the middle and lower Yangtze River basin. And
the frequencies increased over mainland China except for the upper reaches
of the Yangtze River. A regional drought (RD) event is a widespread and
persistent event that covers at least five adjacent sites and lasts for at
least 10 days. There were 252 RD events in the past 50 years---five times
per year. Most RD events lasted for <100 days and covered <100 stations,
but the longest and largest RD event lasted for 307 days from 6 September
1998 to 9 July 1999 and covered 327 stations from North to Southwest China. |
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| Keywords: | site drought event regional drought event climate extreme index drought intensity |
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