关键词: 南极,中山站,昭和站,臭氧洞,中期振荡

Abstract:

In this paper a study has been made on medium range oscillation characteristics at Zhongshan and Syowa stations during Antarctic ozone hole period with the data of atmospheric ozone observed at Zhongshan and Syowa stations in Jul.-Dec.of 1993 and 1994 and with the data of surface temperature and pressure at Zhongshan and radiosound at Davis Station in Jul.-Dec.of 1993.The results show that: 1.Quasi one and two week oscillations are the two main ones commonly existed for Antarctic ozone and temperature and pressure at each level,with different strength in different years.In Zhongshan and Syowa region,the quasi two week oscillation was stronger than the quasi one week oscillation for each atmospheric element in 1993, but in 1994 there occurred only the quasi one week oscillation and no quasi two week oscillation. 2.In Zhongshan Syowa region the quasi one and two week oscillations are propagated from west to east,where the propagating speed for the quasi one week oscillation is about 17 longitudinal degree/day. 3.In Prydz Bay region at middle low stratosphere, the phase difference between the quasi one and two week oscillations for ozone, isobaric height and temperature is very small,the oscillations almost occurring at the same time.The quasi one and two week oscillations can propagate upward and downward through the top of troposphere,and there are close relations between the medium oscillations in troposphere and stratosphere. 4.Quasi two week oscillation is one kind of common medium oscillation with weather scales,confirming to different synoptic system for different regions.In Antarctic region the quasi two week oscillation for total ozone probably reflects the inherent oscillation of polar vortex,and the short period of the quasi one week oscillation could display the oscillation resulting from outside disturbance forcing.