Key Laboratory of Meteorological Disaster;
Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD);
Nanjing University of Information Science and Technology;
Nanjing 210044 China;
National Centre for Atmospheric Research;
Boulder 80301 USA;
Chinese Electric Power Research Institute;
Beijing 100192 China;
South Asian high; interdecadal variation; divergent component; rotational component; SST;