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Atmosphere 2015, 6(10), 1399-1421; doi:10.3390/atmos6101399

Temporal-Spatial Variation of Drought Indicated by SPI and SPEI in Ningxia Hui Autonomous Region, China

1
State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 73000, Gansu, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
3
College of Geographical Science, Shanxi Normal University, Linfen 041000, Shanxi, China
*
Author to whom correspondence should be addressed.
Academic Editor: Robert W. Talbot
Received: 18 June 2015 / Revised: 17 September 2015 / Accepted: 22 September 2015 / Published: 30 September 2015
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Abstract

The Ningxia Hui Autonomous Region of China (Ningxia) is an important food production area in northwest China severely affected by drought. The Standardized Precipitation Index (SPI) and Standardized Precipitation Evapotranspiration Index (SPEI) were calculated based on monthly meteorological data to explore climate change and variation in drought intensity, duration, frequency, and spatial extent in Ningxia during 1972–2011. Results show that the SPEI is more applicable than the SPI for exploring climate change and drought variation in Ningxia. The Ningxia climate experienced a significant drying tendency. Annual SPEI decreased about 0.37 decade−1 during 1972–2011. Drought was exacerbated by this drying tendency. Regional average duration, maximum duration, intensity, and frequency of drought identified by the SPEI increased by one month, three months, 0.15%, and 36.1%, respectively, during 1992–2011 compared to the period of 1972–1991. The spatial extent of drought identified by the SPEI increased about 14.4% decade−1 in the spring during 1972–2011. Spatially, drought frequency increased from north to south. Average intensity (maximum duration) of drought calculated by the SPEI increased (decreased) northward and southward from the central arid area. View Full-Text
Keywords: drought; Standardized Precipitation Index (SPI); Standardized Precipitation Evapotranspiration Index (SPEI); atmospheric circulation; Ningxia Hui Autonomous Region of China drought; Standardized Precipitation Index (SPI); Standardized Precipitation Evapotranspiration Index (SPEI); atmospheric circulation; Ningxia Hui Autonomous Region of China
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Tan, C.; Yang, J.; Li, M. Temporal-Spatial Variation of Drought Indicated by SPI and SPEI in Ningxia Hui Autonomous Region, China. Atmosphere 2015, 6, 1399-1421.

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