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. 1993 ) used the gamma distribution to transform precipitation series to standardized units. Nevertheless, the frequency distributions of the precipitation series show significant changes that depended on the time scale ( Vicente-Serrano 2006 ). Among the different evaluated models, the Pearson III shows enhanced adaptability to precipitation series at different time scales ( Guttman 1999 ; Vicente-Serrano 2006 ; Quiring 2009 ). Therefore, here we use the algorithm described by Vicente
. 1993 ) used the gamma distribution to transform precipitation series to standardized units. Nevertheless, the frequency distributions of the precipitation series show significant changes that depended on the time scale ( Vicente-Serrano 2006 ). Among the different evaluated models, the Pearson III shows enhanced adaptability to precipitation series at different time scales ( Guttman 1999 ; Vicente-Serrano 2006 ; Quiring 2009 ). Therefore, here we use the algorithm described by Vicente
. Tank , and T. Peterson , 2002 : Observed coherent changes in climatic extremes during the second half of the twentieth century . Climate Res. , 19 , 193 – 212 . Guttman , N. B. , 1999 : Accepting the standardized precipitation index: A calculation algorithm . J. Amer. Water Resour. Assoc. , 35 , 311 – 322 . Hu , Y. , W. Dong , and Y. He , 2010 : Impact of land surface forcings on mean and extreme temperature in eastern China . J. Geophys. Res. , 115 , D19117 , doi:10
. Tank , and T. Peterson , 2002 : Observed coherent changes in climatic extremes during the second half of the twentieth century . Climate Res. , 19 , 193 – 212 . Guttman , N. B. , 1999 : Accepting the standardized precipitation index: A calculation algorithm . J. Amer. Water Resour. Assoc. , 35 , 311 – 322 . Hu , Y. , W. Dong , and Y. He , 2010 : Impact of land surface forcings on mean and extreme temperature in eastern China . J. Geophys. Res. , 115 , D19117 , doi:10
parameters of several distributions expressable in inverse form . Water Resour. Res. , 15 , 1049 – 1054 . Guttman , N. B. , 1998 : Comparing the Palmer drought index and the standardized precipitation index . J. Amer. Water Resour. Assoc. , 34 , 113 – 121 . Guttman , N. B. , 1999 : Accepting the standardized precipitation index: A calculation algorithm . J. Amer. Water Resour. Assoc. , 35 , 311 – 322 . Hobbins , M. T. , A. Dai , M. L. Roderick , and G. D. Farquhar , 2008
parameters of several distributions expressable in inverse form . Water Resour. Res. , 15 , 1049 – 1054 . Guttman , N. B. , 1998 : Comparing the Palmer drought index and the standardized precipitation index . J. Amer. Water Resour. Assoc. , 34 , 113 – 121 . Guttman , N. B. , 1999 : Accepting the standardized precipitation index: A calculation algorithm . J. Amer. Water Resour. Assoc. , 35 , 311 – 322 . Hobbins , M. T. , A. Dai , M. L. Roderick , and G. D. Farquhar , 2008
