INTERCOMPARISON OF TOTAL OZONE DATA FROM A DOBSON SPECTROPHOTOMETER, TOMS, VISIBLE WAVELENGTH SPECTROMETER, AND OZONESONDES

Comparisons of total column ozone measurements from three ground-based instruments (Dobson spectrophotometer, ozonesonde, and visible wavele ngth grating spectrometer) and the TOMS instrument are presented for t he period 1991 to 1994 at Arrival Heights/McMurdo, Antarctica. The pri mary purpose of these comparisons is to investigate the accuracy of th e visible spectrometer, while a second aim is to compare version 6 and version 7 TOMS satellite retrievals with the ground-based measurement s. While the Dobson, TOMS and ozonesonde measurements show good agreem ent, there is a seasonal dependence between data from the visible wave length spectrometer and each of the other three instruments. However, the visible spectrometer produces valuable data for the late autumn an d early spring, when data are not available from the Dobson and TOMS.