A model study using GEOSCCM by M.M. Hurwitz and colleagues published in ACPD looked at the influence of an internally-generated QBO on modelled stratospheric climate and ozone. They found that the inclusion of the QBO slows the meridional circulation, thus increasing the mean stratospheric age-of-air. This, in addition to changes in stratospheric temperature, were found to affect the ozone, methane and nitrous oxide distributions. The modelled QBO also enhanced polar stratospheric variability in winter. Differences between simulations with and without a QBO show a bias toward the westerly phase of the QBO, and resultant polar stratospheric cooling, strengthening of the polar stratospheric jet and a small decrease in Arctic lower stratospheric ozone. Find the full abstract here.