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OSIRIS Retrievals of Daytime Mesospheric Ozone

Patrick Sheese(1), Edward Llewellyn(2), Richard Gattinger(2) and Ian McDade(1)

(1) York University, 4700 Keele St., M3J 1P3, Toronto, Canada
(2) University of Saskatchewan, 116 Science Place, S7N 5E2, Saskatoon, Canada


The Canadian OSIRIS instrument, on-board the ESA Third Party Mission satellite Odin, measures Rayleigh scattered sunlight with high vertical and spectral resolution and near-global coverage. As OSIRIS scans the Earth’s limb, one of the atmospheric features observed is the mesospheric molecular A-band dayglow at 762 nm. As one of the predominant sources for the excitation of the A-band dayglow is through the photolysis of local ozone, it is possible to use the observed line-of-sight integrated radiance profiles to retrieve the ozone density profiles. A photochemical model of the dayglow has been developed, which is used in an iterative Optimal Estimation technique, to retrieve ozone densities at altitudes of 70 – 95 km. Retrieval results, with zonal and seasonal variations are presented, together with comparisons of the retrievals with those from the SABER instrument on-board TIMED. Comparisons are also made with OSIRIS O2(1Δ) volume emission rate retrievals and with OSIRIS water vapour retrievals.


Workshop presentation