Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 615, Issue -, Pages 1557-1565Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2017.09.121
Keywords
SPEI-PM; Drought variability; Intensity analysis; Hurst exponent; Prediction; Mongolian Plateau
Categories
Funding
- National Key Technology R&D Program of China [2013BAK05B02]
- China Special Fund for Meteorological Research in the Public Interest [2016006]
- National Natural Science Foundation of China [41571491, 61631011]
- Program of Introducing Talents of Discipline to Universities [B16011]
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Knowledge about variations of drought can provide a scientific basis for water resource planning and drought mitigation. In this study, the variations and patterns of drought identified by the Standardized Precipitation Evapotranspiration Index (SPEI) were investigated on the Mongolian Plateau for the period 1980-2014, based on intensity analysis, linear regression, the Mann-Kendall test, wavelet analysis, and Hurst exponent. The results show that: 1) the annual SPEI decreased at a rate of -0.0133/yr over the past 35 years, and a major abrupt change occurred in 1999; 2) drought on the Mongolian Plateau intensified from 1980 to 2014, and the drought in Mongolia has been more serious than in Inner Mongolia since the beginning of the 21st century; 3) the rate of drought/wet changes in 1980s-1990s and 1990s-2000s were faster than in 2000s-2010s. In 1980s-1990s, the different drought levels were transformed into various wet levels. In 1990s-2000s, the wet levels were transformed into drought, and in 2000s-2010s, the losses of drought levels were larger than the gains in wet levels; 4) the Hurst exponent is a reliable way to predict drought tendency, with a predictive accuracy as high as 91.7%; 5) the mean H value of the SPEI time series during 1980-2014 was 0.533, indicating that the future drought trend is generally consistent with the current state. In the future, the proportion of area with increasingly severe drought (72.2%) will be larger than that with increasingly wetter conditions (27.8%) on the Mongolian Plateau. (C) 2017 Elsevier B.V. All rights reserved.
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