SPATIAL AND TEMPORAL VARIABILITY OF NORTHWEST PACIFIC TROPICAL CYCLONE ACTIVITY IN A GLOBAL WARMING SCENARIO-中国期刊网

摘要 UtilizingtheJointTyphoonWarningCenter(JTWC)andTokyo-TyphoonCenteroftheJapanMeteorologicalAgency(JMARSMCTOKYO)best-tracktropicalcyclone(TC)datafortheperiod1951-2014,variationsinspatialandtemporalcharacteristicsofNorthwestPacificTCactivityforaglobalwarmingscenarioarediscussed.Theresultssuggestthatsincetheearly1960s,therehasbeenanoveralldecreasingtrendinthefrequencyofoccurrence,intensity,peakintensity,lengthofmovement,andlifetimeofTCs.However,globalwanninghasledtoalinearlyincreasingtrendinTCactivityineasternAsia,whichindicatesthatNorthwestPacificTCactivitydecreases,butthefrequencyoflandfallsandintensityarelikelystrengthened.Therefore,thethreatofTCstowardseasternAsiaisenhanced.TheincreaseinTCactivityineasternAsiaislikelytheresultofastrengthenedWalkercirculationduetoanincreasingtemperaturegradientbetweenthenorthwestPacificOceanandthecentralandeasternPacificOcean.ThestrengtheningWalkercirculationcouldincreasethemagnitudeoftheverticalwindshear,relativevorticity,andmeridionalwindshearoflow-leveleasterliesneartheequatorinthetropicalNorthwestPacific,whichaffectsthespatialandtemporalvariationsofTCactivityintheNorthwestPacific.

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SPATIAL AND TEMPORAL VARIABILITY OF NORTHWEST PACIFIC TROPICAL CYCLONE ACTIVITY IN A GLOBAL WARMING SCENARIO

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SPATIAL AND TEMPORAL VARIABILITY OF NORTHWEST PACIFIC TROPICAL CYCLONE ACTIVITY IN A GLOBAL WARMING SCENARIO

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