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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HIJKL:P426.6 MNOPQ:A MRSL:1672643X(2022)05003609
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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