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                              Evolutionlawofcompounddroughtandheatwaveeventsinthe
                                 upperYellowRiverbasinbasedonCMIP6coupledWRF

                                                       1
                                             1
                                                                      1
                                                                                      2
                                  MENBaohui,LXing,CHENShihao,WANGHongrui
                    (1.CollegeofWaterResourcesandHydropowerEngineering,NorthChinaElectricPowerUniversity,Beijing 102206,China;
                                  2.CollegeofWaterSciences,BeijingNormalUniversity,Beijing 100875,China)
                  Abstract:TheCompoundDroughtandHeatwaveeventismoredestructivethanthetraditionalextremeweathere
                  vent,andithasdevelopedrapidlyallovertheworldinrecentyears.Bywhich,theupperYellowRiverbasinis
                  particularlyaffectedasaclimatesensitivearea.Itisofgreatsignificancetodescribeitscharacteristicsandanalyze
                  thefutureevolutiontrendforeventpreventionandcontrol.Inthispaper,adynamicdownscalingmethodoffuture
                  meteorologicaldatabasedonCMIP6coupledwithWRFisproposed.TheCompoundDroughtandHeatwaveevents
                  andtheircharacteristicsunderdifferentscenariosintheupperreachesoftheYellowRiverareidentified ,thediffer
                  encebetweenthecompoundeventandthesingleeventisrevealed ,andthefutureevolutionlawoftheCompound
                  DroughtandHeatwaveeventisanalyzed.Theresultsshowthat :(1)comparedwiththesingleevent,thetempera
                  tureoftheCompoundDroughtandHeatwaveeventinthehistoricalperiod ,SSP245andSSP585scenariosincreases
                  by3.8%,13.1% and13.5%,whilethedroughtindexdecreasesby5.8%,2.6% and2.6%.(2)Underthe
                  SSP245scenario ,thecharacteristicsoftheCompoundDroughtandHeatwaveeventarehighinthesouthwestand
                  lowinthenortheast,whileintheSSP585scenario,thedistributioninthenorthandeastisthehighest.(3)Inthe
                  future ,thecharacteristicsofregionalCompoundDroughtandHeatwaveeventsshowasignificantupwardtrend,in
                  whichtherisingtrendofSSP585ishigherthanthatofSSP245.
                  Keywords:CMIP6;upperYellow Riverbasin;WRFmodel;CompoundDroughtandHeatwaveevents;MK
                  trendtest


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