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中国东部强冷事件发生的过程和条件(英文)

宋磊  吴仁广  
【摘要】:A strong cold event hit eastern China around 24 January 2016 with surface air temperature reaching more than 10oC below climatological mean in most regions of eastern China south of40°N.37 strong cold events similar to the January 2016 one with temperature anomalies over eastern China exceeding-5oC have been identified for the winters from 1979/80 to 2015/16.A comparative analysis with surface temperature anomalies of the same intensity but limited to north of 40°N indicates that the southward invasion of cold air to eastern China south to 40oN is related to two factors.One is the latitudinal location of the upper-level wave train,the surface Siberian high,and the mid-tropospheric East Asian trough over the mid-high latitude Eurasian continent.The other is a subtropical upper-level wave train emanating from the mid-latitude North Atlantic.The emergence of this wave train is related to the positive phase of the North Atlantic Oscillation(NAO)and negative sea surface temperature(SST)anomalies in the subtropical North Atlantic Ocean.When the mid-high latitude wave train is located too northward and the subtropical wave train induces an anomalous mid-tropospheric high over southern China,the East Asian trough does not extend southwestward and the Siberian high does not expand southeastward.In such case,the cold air mainly affects Northeast China and northern Japan.

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