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| Analysis on Spatial and Temporal Patterns of Drought Based on Standardized Precipitation Index in the Hedong Area in Gansu Province |
| Wang Ying1, Li Yaohui1, Hu Tiantian2 |
1. Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province/Key Open Laboratory of Arid Change and Disaster Reduction of CMA, Institute of Arid Meteorology, China Meteorological Administration, Lanzhou 730020, China;
2. College of Atmospheric Science, Lanzhou University, Lanzhou 730000, China |
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Abstract Drought is one of the major natural disasters in Northwest China. Standardized precipitation index (SPI) under various temporal scales were calculated in the Hedong Area of Gansu Province with monthly precipitation data collected in 38 meteorological stations during 1971-2010. The patterns of SPI temporal series with different temporal scale were analyzed; the spatial and temporal changes in the decadal departure and tendency rate of SPI3 and SPI12 were discussed; the frequencies of extreme drought, severe drought and moderate drought were also addressed. Results showed that: (1) With the increase of temporal scale, the randomness of SPI weakened, and its consistence strengthened. There was a higher drought frequency in 1991-2005 than that in 1974-1982. (2) the Hedong Area was humid before 1980s, and then tended to be more arid after 1990s. For the 7 administrative districts in the Hedong Area during 1970s, there was a significant increase in the SPI3, except in Gannan region; during 1980s, there was a continuous decrement in the tendency rate of SPI3. For the tendency rate of SPI12 from 1970s to 2000s, the tendency rate decreased at first, and then increased, in Gannan, Longnan and Tianshui region, while other regions showed an opposite pattern. (3) There was wide spread and high frequency for drought events under three-month scale, which was concentrated in the northern part of Hedong Area. Under the twelve-month scale, extreme drought main occurred in the northern part of the Hedong Area, the severe and moderate drought mainly occurred in the eastern part of the Hedong Area.
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Received: 21 February 2013
Published: 20 January 2014
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2014, Vol. 34 
