Association between Tropical Convection and Boreal Wintertime Extratropical Circulation in 1982／83 and 1988／89-中国期刊网

摘要 Borealwintertimeextratropicalcirculationisstudiedinrelationtothetropicalconvectionduringthe1982/83ElNinoand1988/89LaNina.Theanomalystructureof1982/83and1988/89overtheextratropicsrevealsremarkablydifferentfeaturesasthelongitudinaltropicalforcingregionchanges.TheRossbywavesource(Positive)showsthelargestmaximumoverEastAsiainbothyearsduetothepersistentheatingfromthewesternPacificwarmpoolarea.However,thesinktermshowscontrastingfeaturesoverthesubtropicsandextratropicsbetweenthetwoyears.IntheElNinoyear,enhancedtropicalconvectionovertheeasternPacificproducestheRossbywavesinkat10°NandshiftedeastwardovertheNorthPacific,whileintheLaNinayear,thesinkareaisshiftedwestwardovertheNorthPacific.Thecontrastingfeaturesbetweenthetwoeventsinmean-eddyinteractionappearsespeciallyoverthedownstreamareaoftheEastAsianJet.Theextension(retraction)ofthemeanfloweastward(westward)totheeast(west)ofthedatelineisrelatedwiththeeffectofthewestward(eastward)E-vectorandthestrengthening(weakening)ofthenegativeanomaliesofthebarotropicgrowthofkineticenergy.Hence,almostoppositecharacteristicsbetweenthetwoeventscanexplainthecloserelationshipoftropicalconvectionandtheextratropicalinternalvariability.

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Association between Tropical Convection and Boreal Wintertime Extratropical Circulation in 1982／83 and 1988／89

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Association between Tropical Convection and Boreal Wintertime Extratropical Circulation in 1982／83 and 1988／89

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