Seasonal variation of ozone above Macquarie Island and Davis

Summary

The seasonal variation of ozone in the troposphere and lower stratosphere above Global Atmosphere Watch stations Macquarie Island (in the subantarctic) and Davis (in Antarctica) is examined using three years of ozonesonde measurements. At both sites the variation of ozone mixing ratio has a dominant annual component except near the tropopause where there is significant short timescale variability. For Macquarie Island, the phase of the annual cycle suggests that ozone levels are largely controlled by transport. At Davis transport also has a dominant influence in the lower troposphere. Additionally, effects of the annual ozone hole cause a pronounced phase shift of the annual cycle in the lower stratosphere.

Related projects