| Weather and Climate |
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| Application of Three Drought Evaluation Indices in Ningxia |
| WANG Su-yan1,2, ZHENG Guang-fen1,2, YANG Jie1, LI Xin1 |
1.Key Laboratory of Meteorological Disaster Preventing and Reducing in Ningxia, Yinchuan 750002, China;
2.Ningxia Climate Center, Yinchuan 750002, China |
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Abstract The differences between drought degree assessment by indices as Pa, K, SPI, PDSI and CI, and results from the reality were analyzed from aspects of drought frequency, consistency degree, the vacancy and the miss drought rate of the index assessment. Results indicate that the evaluating effectiveness of these five indices is approximate. But in many years, the drought degrees evaluated by Pa, SPI and K indices are lower than the real, and that by K index is closest to the real. In many areas, the drought frequency evaluated by K index is higher than that by Pa and SPI, showing K index magnifies the drought frequency, especially the frequency of middle drought. In contrast, Pa and SPI indices shrink the frequency obviously. The absolute and the relative consistency rates of K index are all higher than that of Pa and SPI; the difference of consistency rate between Pa and SPI is not evident. Meanwhile, the vacancy rate of K index is higher than that of Pa and SPI, but the miss rate is lower than the two latter; the sum of the vacancy and the miss rates of K index is the lowest, and which in spring is lower than those in other three seasons. In conclusion, the evaluate effectiveness of K and CI is better than the other indices, but they must be improved to fit application in Ningxia .
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Received: 31 May 2011
Published: 20 March 2012
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2012, Vol. 32 
