Page 40 - 《水资源与水工程学报》2022年第5期
P. 40

! 33 " ! 5 #                      & ' ( ) & * + , -                               Vol.33No.5
               2022 $ 10 %              JournalofWaterResources&WaterEngineering                 Oct.,2022

            DOI:10.11705/j.issn.1672-643X.2022.05.05


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               Relationshipbetweenextremeautumnrainfall,atmosphericcirculationand

                         seasurfacetemperatureintheYellowRiverBasinin2021

                                            LIUJing,JINLijun,WANGPeng
                 (HydrologyBureau,YellowRiverConservancyCommissionoftheMinistryofWaterResources,Zhengzhou450004,China)
                 Abstract:InordertoexplorethecharacteristicsandcausesoftheabnormalautumnrainfallintheYellow
                 RiverBasinin2021,weanalyzedtheextremeautumnrainfallof2021andinvestigatedthecirculation
                 backgroundandseasurfacetemperature (SST)anomalycharacteristicsoftheyearswithextremeautumn
                 rainfallsusingdailyprecipitationdataof232stationsintheYellowRiverBasin,monthlyreanalysisdata
                 ofNCEP/NCARandmonthlySSToftheHadleyCenter ,UnitedKingdomMeteorologicalOffice.There
                 sultsshowthattheautumnrainfallintheYellowRiverBasinin2021wasabnormallymoreabundantthan
                 usual ,deviatingfromtheclimaticstatebynearly8standarddeviations.Accumulatedrainfallof62.5%
                 ofthestationsrankedamongthetopfiveinthesameperiodofhistory ,and37.9% rankedfirst,showing
                 significantextremities.Thisisbecausetheshortwavetroughsthatsplitfromthebottomofthelowtrough
                 ofBalkhashLakemovedeastwardandsouthward ,andconvergedwiththesouthwestairflowofthenorth
                 westsideoftheWestPacificSubtropicalHigh (WPSH)inthesouthoftheYellowRiverBasin,resulting
                 inabnormallymoreabundantautumnrainfallin2021.Comparedwiththeotheryearswithextremeau
                 tumnrainfalls,thearea,intensityandwestridgepointofWPSHin2021wereespeciallylarger,stronger
                 andmoretothewest,whiletheintensityofIndianBurmatroughwasweaker.TheSSTintheNorthPa
                 cificinautumnof2021was3.6standarddeviationshigherthantheclimaticstateandtheabnormalde
                 greerankedfirstamongyearswithextremeautumnrainfalls.TheabnormalSSTcausedtheextremeau
                 tumnrainfallthroughtheabnormalresponseofWPSH.Thisstudycanprovideareferenceforautumn
                 rainfallpredictionintheYellowRiverBasin.
                 Keywords:extremeautumnrainfall;precipitation;rainyday;atmosphericcirculation;seasurfacetem

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