Retrieval of ozone profiles from GOMOS limb scattered measurements
Earth and related Environmental sciences
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The GOMOS (Global Ozone Monitoring by Occultation of Stars) instrument on board the Envisat satellite measures the vertical composition of the atmosphere using the stellar occultation technique. While the night-time occultations of GOMOS have been proven to be of good quality, the daytime occultations are more challenging due to weaker signal-to-noise ratio. During daytime GOMOS measures limb scattered solar radiation in addition to stellar radiation. In this paper we introduce a retrieval method that determines ozone profiles between 20-60 km from GOMOS limb scattered solar radiances. GOMOS observations contain a considerable amount of stray light at high altitudes. We introduce a method for removing stray light and demonstrate its feasibility by comparing the corrected radiances against those measured by the OSIRIS (Optical Spectrograph & Infra Red Imaging System) instrument. For the retrieval of ozone profiles, a standard onion peeling method is used. The first comparisons with other data sets suggest that the retrieved ozone profiles in 22-50 km are within 10% compared with the GOMOS night-time occultations and within 15% compared with OSIRIS. GOMOS has measured about 350 000 daytime profiles since 2002. The retrieval method presented here makes this large amount of data available for scientific use.
CitationTukiainen, S.; Kyrola, E.; Verronen, P.T.; Fussen, D.; Blanot, L.; Barrot, G.; Hauchecorne, A.; Lloyd, N. (2011). Retrieval of ozone profiles from GOMOS limb scattered measurements. , Atmospheric Measurement Techniques, Vol. 4, Issue 4, 659-667, DOI: 10.5194/amt-4-659-2011.