A NUMERICAL STUDY ON THE INTERANNUAL TIME-SCALE LOW-FREQUENCY OSCILLATION

Low-frequency oscillation(LFO) of a large-scale flow pattern is an important observational characteristic feature. In this paper, under the forcing of annual periodic variation a two-layer quasi-geostrophic low-spectrum model is used for carrying out a prolonged numerical integration of more than 30 model years. In the model atmosphere, the interannual time-scale LFO is implicitly reproduced. The result is quite agreeable with the observational evidence.