The Study On The Applicability Of Five Drought Indexes In Hohhot

This study aims to collect from 1986 to 2015,a total of 30 a Hohhot six countries generally stations(wuchuan station,tuzuoqi station,suburban Hohhot station,tuoxian station,helin ststion,qingshuihe station)and 1 national basic weather stations(Hohhot station)meteorological data,based on the calculation of the temperature,precipitation,sunshine and other meteorological elements and statistics,Obtained including precipitation anomaly percentage(PA),relatively humid index(MI),standardized precipitation index(SPI),standardized precipitation index of evapotranspiration(SPEI),meteorological drought index(MCI)the result of a total of five kinds of meteorological drought index,according to the new GB/T 20481-2017 meteorological drought grade and the calculation results are hierarchies to statistical analysis of the results,with the disaster report data,statistics and comparative analysis of the precipitation of The applicability of the five meteorological drought indexes in Hohhot city was determined by time division(month of typical drought year and month of atypical drought year)and region division(county division).According to the data,the overall situation is that MI is the most indicative,SPEI and MCI are next,and SPI and PA are the lightest.In typical dry years,MI had the highest indicative accuracy,followed by MCI,SPEI,and SPI,and PA the worst.In atypical drought years,the MI reflection is the closest to the truth,followed by PA and SPEI,with PA overall light and SPEI overall heavy;SPI and MCI again,the ratio of reevaluation and missed evaluation is higher.In the analysis of Hohhot's five different flag counties,MI and MCI were the most accurate,SPEI and SPI were second,and PA was the worst.According to the two categories of reporting(accurate+light+heavy)and omission,the reporting rate of MI is the highest,the reporting rate of MCI is second only to MI,SPEI and SPI,and the reporting rate of PA is the lowest.In general,the five indexes reported the highest rate for qingshuihe station and the lowest rate for wuchuan station.MI and MCI were the most accurate,SPEI and SPI were second,and PA was the worst.On a monthly basis,MI is more indicative for April,May and June,SPI is more indicative for July and August,SPEI is more indicative for May,June,July,August and September,and MCI is more indicative for July,August and September.