Comparisons of the Pacific Subtropical High and the South Asia High between.pdf

Comparisons of the Pacific Subtropical High and the South Asia High between.pdf

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1、Vol.14No.2JOURNALOFTROPICALMETEOROLOGYDecember2008ArticleID:1006-8775(2008)02-0121-04COMPARISONSOFTHEWESTPACIFICSUBTROPICALHIGHANDTHESOUTHASIAHIGHBETWEENNCEP/NCARANDECMWFREANALYSISDATASETSCHENWen(陈雯),ZHIXie-fei(智协飞)(JiangsuKeyLaboratoryofMeteorologicalDisaster,NUIST,Nanjing210044C

2、hina)Abstract:ComparisonsofthewestPacificsubtropicalhighwiththeSouthAsiaHigharemadeusingtheNCEP/NCARandECMWF500hPaand100hPamonthlyborealgeopotentialheightfieldsfortheperiod1961–2000.Discrepanciesarefoundforthetimepriorto1980.ThewestPacificsubtropicalhighintheNCEP/NCARdataislessint

3、ensethaninECMWFdatabefore1980.TherangeandstrengthofthewestPacificsubtropicalhighvariationdescribedbytheNCEP/NCARdataarelargerthanthosedepictedbyECMWFdata.Thesamesituationappearsinthe100-hPageopotentialfield.Thesediscoveriessuggestthattheinterdecadalvariationofthetwosystemsasshownb

4、ytheNCEP/NCARdatamaynotbetrue.Besides,theSouthAsiaHighcenterintheNCEP/NCARdataisobviouslystrongerthanintheECMWFdataduringtheperiods1969,1979–1991and1992–1995.Furthermore,therangeislargerfrom1992to1995.Keywords:reanalysisdatasets;westPacificsubtropicalhigh;SouthAsiaHigh;comparisons

5、CLCnumber:P458.1.24Documentcode:A1INTRODUCTIONfieldforJune,JulyandAugustisusedtorepresentthesummerofagivenyear.AccumulativeanomaliesandThewestPacificsubtropicalhighandSouthAsiaan11-yearrunningmeanareusedtoanalyzethehigharetwoimportantsystemsaffectingtheweathertemporaltendencyofthe

6、geopotentialfield.Testsare[1-4]andclimateinChina.MostofwhathasbeenconductedforabruptchangesinitstimeseriesbystudieduptonowisbasedonthereanalysisdataofmeansoftherunningT-test[15]andtheMann-KendallNCEP/NCARorECMWF.Atpresent,quiteamethod[16,17].numberofmeteorologistshaveconductedrese

7、archonmeteorologicalelementsondifferenttemporaland3COMPARISONOFTHEWESTPACIFICspatialscalesusingdifferentdatasets,withtheresultsSUBTROPICALHIGHINBOREALshowingthatthetwodataseriesarebothsimilartoand[5-14]SUMMERyetverydistinctivefromeachother.Inthisstudy,thetworeanalysisdatasetsareco

8、mparedfortheirItisknownfrom500hPa

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