THERMAL FORCING IMPACTS OF THE EASTERLY VORTEX ON THE EAST-WEST SHIFT OF THE SUBTROPICAL ANTICYCLONE OVER WESTERN PACIFIC OCEAN-中国Betway体育网页登陆

摘要 ByemployingtheNCEP/NCARreanalysisdatasets(1000to10hPa,2.5°×2.5°),thethermalforcingimpactsareanalyzedofaneasterlyvortex(shortenedasEV)overthetropicaluppertroposphereonthequasi-horizontalmovementoftheWesternPacificSubtropicalAnticyclone(shortenedasWPSA)during22-25June2003.Therelevantmechanismsarediscussedaswell.Itisshownthatthedistributionandintensityofthenon-adiabaticeffectneartheEVresultintheanomalouseastwardretreatoftheWPSA.TheWPSAprefersextendingtothecolderregion,i.e.,itmovestowardtheregioninwhichthenon-adiabaticheatingisweakeningorthecoolingisstrengthening.DuringtheWPSAretreat,theapparentchangesofnon-adiabaticheatingillustratethecharacteristicsofenhancedcoolingintheeastsideoftheEV.Meanwhile,thecoolinginthewestsideexhibitsaweakenedeastwardtrend,mostprominentlyat300hPainthetroposphere.Theevidenceonthefactorscausingthechangeinthermalconditionisfound:themostimportantcontributiontotheheating-ratetrendistheverticaltransportterm,followedinturnbythelocalchangeintheheatingratetermandthehorizontaladvectionterm.Asaresult,theatmosphericnon-adiabaticheatinggeneratedbytheverticaltransportandlocalchangediscussedaboveismainlyconnectedtotheretreatoftheWPSA.

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THERMAL FORCING IMPACTS OF THE EASTERLY VORTEX ON THE EAST-WEST SHIFT OF THE SUBTROPICAL ANTICYCLONE OVER WESTERN PACIFIC OCEAN

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