Retrieval of ozone profiles from GOMOS limb scattered measurements
| Autor: | S. Tukiainen, E. Kyrölä, P. T. Verronen, D. Fussen, L. Blanot, G. Barrot, A. Hauchecorne, N. Lloyd |
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| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: | |
| Zdroj: | Atmospheric Measurement Techniques, Vol 4, Iss 4, Pp 659-667 (2011) |
| Druh dokumentu: | article |
| ISSN: | 1867-1381 1867-8548 30643805 |
| DOI: | 10.5194/amt-4-659-2011 |
| Popis: | 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. |
| Databáze: | Directory of Open Access Journals |
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