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| Climatic Background of Persistent Drought in Ningxia Hui Autonomous Region, China |
| Tan Chunping1,2, Yang Jianping1, Qin Dahe1, Li Man1,2 |
1. State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 73000, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract Based on the annual drought elements from 1978 to 2010, the monthly mean air temperature and monthly precipitation of 23 meteorological stations from 1971 to 2011 in Ningxia, the climatic background of the persistent drought was analyzed according to the spatial and temporal variation characteristics of drought and climate which were analyzed in detail by Mann-Kendall test. The drought displayed a persistent aggravation tendency in Ningxia from 1978 to 2010. The number of victims, the disaster areas of crops and the direct economic loss increased by 28.78×104 person/10a, 3.16×104 hm2/10a and 8 504.04×104 RMB/10a, respectively. The drought aggravation speed showed a decreasing trend from the central area to the south and the north area. The climate change in Ningxia was becoming warmer and drier. In recent 41 years, the annual mean air temperature, annual mean maximum air temperature and annual mean minimum air temperature showed a significant increasing trend, with a rate of temperature rise by 0.42 ℃/10a, 0.37 ℃/10a and 0.50 ℃/10a, respectively. The climate warming was characterized by temperature rise all year, and a significant warming mutation of the annual mean air temperature and annual mean maximum air temperature occurred in the early 1990s. Precipitation in Ningxia showed a non-significant decreasing trend from 1971 to 2011. The persistent drought in Ningxia was attributed to the synthetic action of the sustained and rapid rise in air temperature and the decrease in precipitation. The significant temperature rise was the main climatic factor of the aggravated drought in Ningxia.
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Received: 14 February 2013
Published: 20 March 2014
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2014, Vol. 34 
