Influence of East Asian Winter Monsoon on Winter Air Temperature in Northeast China

The contrastive analysis of the winter monsoon intensity index and the winter air temperature in Northeast China during 1961-2011 is made by using the temperature dataset from National Meteorological Information Center of CMA and the data of the NCEP/NCAR reanalysis. The result shows that abnormal cold and warm events increased obviously in Northeast China since the 1990's, and the strong and weak EAWM abnormal events were relatively increased. A warming climate jump of the winter air temperature occurred in Northeast China in 1986. EAWM has turned to continuous weaker at the same time. EAWM entered the stronger stage in 2004. The winter air temperature in Northeast China appeared the emergence of signs in2009-2011 years which was into the low temperature stage. EAWM influenced the abnormal of some systems such as the East Asian westerly jet stream at 200 h Pa, East Asia trough and the high in Ural at 500 h Pa, wind at850 h Pa, Siberian high on the ground to lead to the interannual and interdecadal abnormal of the winter air temperature in Northeast China.