Boreal Winter Rainfall Anomaly over the Tropical Indo-Pacific and Its Effect on Northern Hemisphere Atmospheric Circulation in CMIP5 Models-中国期刊网

摘要 Experimentaloutputsof11AtmosphericModelIntercomparisonProject(AMIP)modelsfromphase5oftheCoupledModelIntercomparisonProject(CMIP5)areanalyzedtoassesstheatmosphericcirculationanomalyoverNorthernHemisphereinducedbytheanomalousrainfallovertropicalPacificandIndianOceanduringborealwinter.Theanalysisshowsthatthemainfeaturesoftheinterannualvariationoftropicalrainfallanomalies,especiallyovertheCentralPacific(CP)(5°S–5°N,175°E–135°W)andIndo-westernPacific(IWP)(20°S–20°N,110°–150°E)arewellcapturedinalltheCMIP5/AMIPmodels.FortheIWPandwesternIndianOcean(WIO)(10°S–10°N,45°–75°E),theanomalousrainfallisweakerinthe11CMIP5/AMIPmodelsthanintheobservation.DuringElNi°no/LaNi°namaturephasesinborealwinter,consistentwithobservations,therearegeopotentialheightanomaliesknownasthePacificNorthAmerican(PNA)patternandIndo-westernPacificandEastAsia(IWPEA)patternintheuppertroposphere,andthenorthwesternPacificanticyclone(cyclone)(NWPA)inthelowertroposphereinthemodels.ComparisonbetweenthemodelsandobservationsshowsthattheabilitytosimulatethePNAandNWPApatterndependsontheabilitytosimulatetheanomalousrainfallovertheCP,whiletheabilitytosimulatetheIWPEApatternisrelatedtotheabilitytosimulatetherainfallanomalyintheIWPandWIO,astheSSTanomalyissameinAMIPexperiments.ItisfoundthatthetropicalrainfallanomalyisimportantinmodelingtheimpactofthetropicalIndo-PacificOceanontheextratropicalatmosphericcirculationanomaly.

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Boreal Winter Rainfall Anomaly over the Tropical Indo-Pacific and Its Effect on Northern Hemisphere Atmospheric Circulation in CMIP5 Models

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Boreal Winter Rainfall Anomaly over the Tropical Indo-Pacific and Its Effect on Northern Hemisphere Atmospheric Circulation in CMIP5 Models

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