MODELING THE GLOBAL INTERANNUAL VARIABILITY OF OZONE DUE TO THE EQUATORIAL QBO AND TO EXTRATROPICAL PLANETARY WAVE VARIABILITY

By forcing an interactive chemical-dynamical model of the stratosphere with the observed Singapore zonal winds and with the observed daily v arying planetary wave heights just above the tropopause over the perio d from March 1980 to February 1993, much of the observed interannual v ariability (IAV) in the monthly mean ozone column from pole to pole wa s able to be reproduced. The best correlations were obtained equatorwa rd of 50 degrees during winter and autumn in both hemispheres. These c orrelations were due to the model's interaction with the specified equ atorial zonal wind. In the Southern Hemisphere, the observed high-lati tude ozone anomaly in November (the month with the largest anomaly) is well anticorrelated with the 20-mb Singapore wind, and correlations s uggest the anomaly propagates poleward from 45 degrees S in August and possibly even from 15 degrees S in June. The model reproduces this be havior well. In the Northern Hemisphere (NH), by contrast, the observe d high-latitude ozone anomaly is not well correlated with the equatori al quasi-biennial oscillation nor does it propagate from lower latitud es. Model results demonstrate that the NH high-latitude ozone anomaly is influenced strongly by the IAV in the forcing of the planetary wave s. Model results show a large IAV in the ozone column during polar nig ht in the NH (where the Total Ozone Mapping Spectrometer is not able t o observe) that is due to the IAV in the forcing of planetary waves.