Natural SciencesEarth SciencesMeteorologyAir-sea InteractionClimate ScienceClimatologyClimate TeleconnectionsMonsoon ClimatologyMonsoon DynamicsRegional ClimateRegional ClimatologySea Surface TemperatureAsian Monsoon SystemEast Asian MonsoonNumerical SimulationSea Ice Area MeasurementSea Level Pressure PatternsSea Surface Temperature TeleconnectionsSeasonal Climate VariationTeleconnection Patterns
By analyzing the observation data and performing the numerical simulation tests,it is shownthat the Kara and the Barents Sea area is a key region to influence climate variation over theNorthern Hemisphere.The variation of winter sea-ice area in the key region is closely associatedwith that of the EU teleconnection pattern at 500 hPa and East Asia winter monsoon(EAWM)intensity.When a heavy sea-ice prevails in the key region,the EU teleconnection pattern at 500hPa is excited easily(there are positive 500 hPa height anomalies over around Japan and WestEurope),and winter Siberia high is weakened,meanwhile,sea level pressure(SLP)has positiveanomalies over the Northern Pacific.Therefore,EAWM will be weakened,winter temperatureover East Asia is above normal and the frequency of cold-air activity in February in China will bedecreased.When the light sea-ice occurs in the key region,the results will be opposite.