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Although limited to a few sites in each hemisphere, these are the only data that extend from the 1960s onward, before the satellite era.
We next present microwave limb sounder (MLS) satellite observations (available from 2004 to present), to probe the consistency between the limited spatial sampling of the balloons from a few surface sites to the extensive coverage of the satellite and to examine how data from the MLS platform compare with the most extreme local depletions observed in situ.
We first examine in situ ozone observations obtained by balloonsondes at ground stations.
The extensive springtime depletion of Antarctic ozone has attracted both public and scientific interest since its discovery (1) and explanation in the 1980s.
The ozone hole has been linked to the coupling of human-made chlorofluorocarbons with surface chemistry on and in polar stratospheric clouds (PSCs) that form during extreme cold conditions (2).
Our goal is to present the observations in a manner that readily shows similarities and differences, and provides insights into chemical processes, particularly the role of polar stratospheric cloud chemistry.
The data presentation should also be useful for future studies testing the ability of numerical models to fully simulate ozone depletion.