Temporal and Spatial Characteristics of Intraseasonal Oscillations in the Meridional Wind Field over the Subtropical Northern Pacific-中国Betway体育网页登陆

摘要 BasedontheNCEP/NCARreanalysisIdailydatafrom1958to2002,climaticcharacteristicsofthe30-60-dayintraseasonaloscillations(ISOs)ofthezonalwind(u),meridionalwind(v),andgeopotentialheight(h)overglobalareasandespeciallytheISOofvoverthesubtropicalnorthernPacificareanalyzedusingthespace-timespectrumanalysisandwavelettransformmethods.TheresultsshowthattheISOofvisverydifferentfromthoseofuandh,withtheformerrepresentingthemeridionallow-frequencydisturbances,whicharethemostactiveinthesubtropicsandmid-highlatitudes,butveryweakinthetropics.InthesubtropicalNorthernHemisphere,theenergiesoftheISOsofuandharebothconcentratedonthewaveswithwavenumberof1andperiodsof30-60days,whilethemainenergyoftheISOofvisconcentratedonthewaveswithwavenumbersof4-6andperiodsof30-60and70-90days.Thewestwardpropagatingenergiesforthe30-60-dayoscillationsofu,v,andhareallstrongerthantheeastwardpropagatingenergiesinthesubtropics.Inaddition,theISOofvisthestrongest(weakest)insummer(winter)overthesubtropicsofEastAsiaandnorthwesternPacific,whilethesituationisreversedoverthesubtropicalnortheasternPacific,revealinga'seesaw'oftheISOintensitywithseasonsoverthesubtropicsfromthenorthwesterntonortheasternPacific.InthesubtropicalnorthwesternPacific,theinterannualandinterdecadalchangesoftheISOforvat850hPaindicatethatitsactivitiesaresignificantlystrongduring1958-1975,whileobviouslyweakduring1976-1990,andarethestrongestduring1991-2000,anditsspectralenergyisobviouslyabnormalbutrulelessduringtheENSOperiods.However,inthe2-7-yrbandpassfilteringseries,theinterannualchangesofthevISOoverthesubtropicalnorthwesternPacificcontaindistinctENSOsignals.Andinthe9-yrlow-passfilteringseries,thevISOchangesoverthesubtropicalnorthwesternPacificaresignificantlyoutofphasewiththechangesoftheNino-3.4SST,

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Temporal and Spatial Characteristics of Intraseasonal Oscillations in the Meridional Wind Field over the Subtropical Northern Pacific

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