Abstract

Column amounts of stratospheric NO₂ have been measured at Lauder, New Zealand since December 1980; and at Arrival Heights, Antarctic, since September 1982. As the data sets grow their usefulness for trend analysis increases, with the time span covered approaching a complete solar cycle. This paper comments on the significance of trends seen in the data, and emphasizes the important "control" role that is exercised by such ground-based measurements. Refinements in retrieval methods have significantly reduced errors since measurements were first initiated.

© 1990 Optical Society of America