Abstract
As a representative index for monitoring and assessing drought, the Standardized Precipitation Index (SPI) relies on a suitable probability distribution function (PDF) to describe a precipitation series, which allows interregional comparisons following normalization. In this study, we considered nine PDFs (exponential (EXP), extreme value (EV), gamma (GAM), generalized Pareto (GP), logistic (LO), log-logistic (LOL), log-normal (LON), normal (NOR), and Weibull (WEI)) as candidates for use in SPI calculations. Based on monthly precipitation time series data (1961–2015) from 582 stations across China, together with the Kolmogorov–Smirnov (K–S) and Akaike Information Criterion (AIC) methods, differences in optimal PDFs for SPI calculations were compared comprehensively from the perspectives of timescale, record length, and index value. Based on the SPI calculated using the optimal PDF at the 6-month timescale (SPI6-opt), we analyzed the spatiotemporal characteristics of drought trends in China using the Mann–Kendall method. Results indicated both the timescale and the record length would affect the selection of the optimal PDF. The performance of the WEI and GAM distributions was superior to other distributions in describing monthly precipitation (especially for long precipitation records) at short and multiple timescales, respectively. During the entire study period, areas of China with high frequency of drought have transferred from the northwest (1960s), to the northeast (2000s), and to the southwest (most recent 5 years). Trend analysis revealed a noticeable wetting tendency confined mainly to Northwest, Northeast, and Southeast China and a significant trend toward drought in Southwest China and on the North China Plain.
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Acknowledgments
We gratefully acknowledge the China Meteorological Administration for providing climate datasets.
Funding
This work is supported financially by the National Key Research and Development Program of China (Grant No. 2017YFC0404603), National Natural Science Foundation of China (Grant No. 51779009), 111Project(B18006), and Geology and Mineral Resources Survey Project (Grant No. DD20190652).
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Zhao, R., Wang, H., Zhan, C. et al. Comparative analysis of probability distributions for the Standardized Precipitation Index and drought evolution in China during 1961–2015. Theor Appl Climatol 139, 1363–1377 (2020). https://doi.org/10.1007/s00704-019-03050-0
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DOI: https://doi.org/10.1007/s00704-019-03050-0