| 天气与气候 |
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| Response of Severe Drought Events in Ningxia to Climate Change during Recent 44 Years |
SANG Jian-ren1, LIU Yu-lan2, SHU Zhi-liang1
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| 1.Ningxia Key Laboratory for Disaster Prevention and Reduction，Yinchuan 750002, China;
2.Yinchuan Meteorological Administration, Yinchuan 750002, China |
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Abstract Based on the precipitation data from 20 stations over Ningxia during 1961—2004, the severe drought events and its response to the climate change were studied. The results showed that the severe drought events occurred frequently, lasted long and reduced from south to north. The severe drought events appeared more in winter than in other seasons, lasted mostly two seasons from autumn to winter or three seasons from autumn to winter till the next spring. In the key period of wheat growing, severe drought events bring out serious loss. The wavelet analysis indicted that the 8\|year scale periodicity of the severe drought events was apparent. With global climate warming, the frequencies of severe drought events increased clearly, especially the very severe event with duration n≥90 days obviously increased since the middle 1990s, with high frequency at present.
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Received: 28 October 2006
Published: 20 September 2007
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2007, Vol. 27 
