初夏850hpa西太平洋副热带高压的气候特征与分析

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1、trainapPearedinthe500hPaheightfieldoftheAsianregionatmosPhericcirculation，theareaofo比otskSea15notcontrolledbyblockinghighPressure，highlatitudeeoldairPathswiftsnorthward，theEastAsianmid一latitudeeoldair15weaker，lowPressuredisturbaneeinMei扣frontareaweakens，theEastAsiansumme

2、rmonsooneireulationstrengthens，theeoldairinChan自iangandHuaiheRiverbasin15weaker，thePreciPitationinChan自iangandHuaiheRiverBasin15lowerthannormal.Fortheanualvariation，thew七stemPacifiesubtroPiealhighinternalvortieitychange15themmajorreasonofehangingoftheloeationandsizeofthe

3、subtroPiealhighchanges.Negative(Positive)vortieitytransPortfromboundarytotheregioncanmakethePotentialheighioftheregionhigher(lower).Ifmorenegative(Positive)vortieity15transPortedfromSubtroPicalhighregiontothewest，thewestridgePointmoveswestward(eastward)sideoftheoutPutofm

4、orecondueivetothewestwardextensionofthew亡StridgePoints(Eastbaek)，anareaSubtroPiealhighregionofincreases(deereases);W亡StridgePointlatitudeindexandthesouthemboundaryvorticitytransferaresignifieantlyPositiveeorrelated，namelythemoreregionsubtroPicalhighoutPutnegative(Positiv

5、e)vorticitytothesouththemorebenefieialtothesubtroPiealhighshiftssouthward(northward).TheinflueneeofequatorialPaeifieSSTaonthe850hPaW七StPacifiesubtroPiealhighridgePointindexandareaindex15signifieant，andtheinfluenceofeachseaareaonthesubtroPicalhighweakensgraduallyfromwestt

6、oeast.WhenNinol+2SSTa15Positive(negative)abnormalinthelatesPringandearlysummeroftheeurrentyear，it15beneficialforthew七StPaeificsubtroPicalhighridgePointsmoveseastward(westward)，south(northward)，areatodeerease(increase).Earlysummerridgeof850hPaWesternPacifiesubtroPiealhigh

7、themoveseastward(westward)，theridgem0VeSnorthward(Southward)，area15smaller(larger)，it15benefieialforSSTaNino4areatoaPPearPositive(negative)anomalyatthetransitionofautumnandwinterRelationshiPbetweenthesubtroPicalhighindicesandNino3areaandNino3.4areasandshowthetwofeaturesa

8、bove，butwithsmallereorrelationeoefficient.Inlead一relatedanalysis，theequatorialPacifieSSTa15higher(lower