Heavy Ozone Enrichments from ATMOS Infrared Solar Spectra

Vertical enrichment profiles of stratospheric 160160180 and 160•80160 (hereafter referred to as 6680 3 and 6860 3 respectively) have been derived from space-based solar occultation spectra recorded at 0.01 cm -I resolution by the ATMOS (Atmospheric Trace MOlecule Spectroscopy) Fouriertransform infrared (FTIR) spectrometer. The observations, made during the Spacelab 3 and ATLAS-l, -2, and -3 shuttle missions, cover polar, mid-latitude and tropical regions between 26 to 2.6 mb inclusive (--25 to 41 km). Average enrichments, weighted by molecular 480 3 density, of (15+6)% were found for 6680 3 and (10+7)% for 6860 3 . Defining the mixing ratio of 500 3 as the sum of those for 6680 3 and 68603, an enrichment of (13+5)% was found for 500 3 (lc• standard eviation). No latitudinal or vertical gradients were found outside this standard deviation. From a series of ground-based measurements by the ATMOS instrument at Table Mountain, California (34.4øN), an average total column 6680 3 enrichment of (17+4)% (1 c• standard deviation) was determined, with no significant seasonal variation discernable. Possible biases in the spectral intensities that affect the determination of absolute enrichments are