Basic State of MMC and Its Correlation with Atmospheric Ozone Variation

The correlativity of mean meridional circulation (MMC)-ozone and the evolving relationship between Hadley circulation character and ozone are presented in this paper. Analysis on the basis of the European Centre for Medium-Range Weather Forecasts (ECMWF) ERA-40 meridional wind and ozone mass mixing ratio month averaged global data for 540 months from September 1957 to August 2002 revealed that correspondence and correlativity between MMC and ozone are strong in the vertical direction. MMC is a major factor in the formation of the average state distribution of horizontal and vertical ozone and seasonal and interdecadal change. In addition, the change in ozone concentration over the Northern Hemisphere in the vertical direction is more obvious than that in the Southern Hemisphere. Moreover, correlativity differs between MMC and ozone concentration at various altitudes and latitudes. Such close correlativity between ozone and Hadley circulation indicates that Hadley circulation plays an important role in global atmospheric ozone changes.