Intercomparison of the Summertime Subtropical High from the ERA-40 and over East Eurasia and the western North Pacific-中国Betway体育网页登陆

摘要 Anintercomparisonofsummertime(JJA)subtropicalgeopotentialheightsfromtheERA-40andNCEP/NCARreanalysisisspecificallyconductedoverEastEurasiaandthewesternNorthPacific.TheNCEP/NCARisobviouslylowerthantheERA-40inthemid-to-lowertroposphereinmostregionsofEastEurasiabeforethemid-1970s,butbecomeshigherthantheERA-40afterthemid-1970sandthusdemonstratesstrongerincreasedtrendsduringtheperiodof1958-2001.BothreanalysesarelowerthantheobservationsinmostregionsofChina.TheNCEP/NCARespeciallyshowstremendouslysystematiclowervaluesbeforethemid-1960sanddisplaysabruptchangesbeforethe1970s.SeveralindicesofthewesternNorthPacificsubtropicalhigh(WNPSH),calculatedfrombothreanalyzedsummergeopotentialheights,alsorevealthatthevariationtrendoftheNCEP/NCARisstrongerthanthatoftheERA-40inthemid-to-lowertropospherefrom1958to2001.Throughsingularvaluedecomposition(SVD)analysis,thesummergeopotentialheightsat500hPafromtheERA-40arebetterthantheNCEP/NCARcounterpartsatinteractingwiththeprecipitationovertheEastAsianmonsoonregion.TheresultsindicatethattheNCEP/NCARinthemid-and-lowertropospheremayoverestimateinterdecadalchangesandshouldbeusedcautiouslytostudytherelationshipbetweentheWNPSHandprecipitationovetherEastAsiaMonsoonregionbeforethemid-1970s.

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Intercomparison of the Summertime Subtropical High from the ERA-40 and over East Eurasia and the western North Pacific

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