The Influence of Tibetan Plateau on the Interannual Variability of Atmospheric Circulation over Tropical Pacific

An atmospheric general circulation model (AGCM) with 9 sigma levels in the vertical and rhomboidal trunction at wave number 15 in the horizontal is run for 10 years with and without the Tibetan Plateau respectively (called TP and NTP experiment). The result simulated is used to investigate the influence of the Tibetan Plateau on the interannual variability of atmospheric circulation over tropical Pacific. It is found that the spatial and temporal dis-tributions of the interannual variability of the wind field over tropical Pacific in TP experiment and those in NTP ex-periment agree with each other except for the intensity, and both of them are consistent with observations well. Fur-ther analysis shows that in El Nino period the Tibetan Plateau strengthens the intensity of El Nino event, while in La Nina period it weakens the intensity of La Nina