NUMERICAL SIMULATION OF THE FORMATION MECHANISM OF THE ANTARCTIC OZONE HOLE^*

The global zonally averaged atmospheric chemistry model is developed in this paper.The formation mechanism of the Antarctic ozone hole is numerically simulated using the model to check the viewpoints on the formation mechanism.The results show that:(1)The Antarctic ozone hole is a special phenomenon resulting from the heterogeneous reactions on the surface of the polar stratospheric cloud particles,under the special conditions of temperature and circulation in Antarctic spring.The heterogeneous reactions reduce the NO2 concentration,resulting in the decrease of ozone production rate.The ozone content decreases when its production is less than its destruction.This is the direct cause for the formation of the Antarctic ozone hole.(2)The impact of the polar vortex on the transport of trace species is not the determinative factor in the formation of the Antarctic ozone hole.but makes the intensity of the ozone hole changed.(3)The solar cycles have negligible influence on the intensity of the Antarctic ozone hole through photochemical reactions.