The Seasonal Cycle of Longitude-dependent Ozone Transport by Large-scale Waves in the Northern Hemisphere

[摘要] The dependence of longitude-dependent total ozone patterns on large-scale wave structures is analyzed by a pattern correlation of the mean fields (climatology), as well as of the decadal change (trend) for the 1979 to 1992 period. In all months, there exists a significant negative regression between total ozone and 300 hPa geopotential height patterns for the climatology (annual average: -0.18 DU/m), and for the trend (-0.14(DU/10 years)/(m/10 years)). For both, the regression coefficients exhibit an asymmetric annual variation with respect to the solstices with significantly higher values in spring, and lower values in autumn. Assuming that the ozone transport is primarily caused by the annual variation of large-scale wave transport in a background ozone field, we show that the seasonal cycles are mainly determined by the asymmetric annual variation of the gradients of the zonal mean ozone field, and not by the annual variability of the wave activity.

[学科分类] 大气科学