State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics LASGand Center for Monsoon System Research CMSR Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029;
Graduate University of the Chinese Academy of Sciences Beijing 100039;
National Centre for Atmospheric Science-Climate NCAS Centre for Global Atmospheric Modelling Department of Meteorology University of Reading Reading United Kingdom;
internal atmospheric variability; North Atlantic Oscillation; Arctic Oscillation; Antarctic Oscillation; extratropical climate anomalies; East Asian winter monsoon;