Summary
An important component of the SPARC/IO3C/IGACO-‐O3/NDAACC (SI2N) initiative "Past Changes in the Vertical Distribution of Ozone" is the "Ozone Sonde Data Quality Assessment (O3S-‐DQA)" activity currently underway. The objectives of this activity are to homogenise selected ozonesonde datasets (that is, re-‐process the data in a consistent manner across different equipment types and operating methods) and secondly, to document this homogenisation process and the quality of ozonesonde measurements more generally. The Bureau of Meteorology is participating in the O3S-‐DQA and two long-‐standing Bureau ozonesonde datasets are now being homogenised according to the agreed guidelines, Broadmeadows (144.95° E, 37.69° S) and Macquarie Island (158.94° E, 54.50° S). These sites are of particular importance as being among the very few in the Southern Hemisphere mid-‐latitudes. In the first part of the presentation the key components of the homogenisation procedure will be briefly discussed, and how each consideration applies to the Australian record. In the second part, some features of the newly-‐homogenised datasets will be presented, in particular evaluations of trends and interannual variability at different altitudes.
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