Comparison of OSIRIS stratospheric NO₂ and O₃ measurements with ground-based Fourier transform spectrometer measurements at the Toronto Atmospheric Observatory

Authors: Taylor, J R.; Strong, K; McLinden, C A.; Degenstein, D A.; Haley, C S.

Source: Canadian Journal of Physics, Volume 85, Number 11, November 2007 , pp. 1301-1316(16)

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Abstract:

Stratospheric NO₂ and O₃ retrieved from measurements of limb-scattered sunlight made by the Optical Spectrograph and InfraRed Imager System (OSIRIS) are compared with like observations made by a ground-based infrared Fourier Transform Spectrometer at the Toronto Atmospheric Observatory (TAO-FTS). Two different versions of OSIRIS NO₂ are compared (DOAS version 3.0 and MART version 2.0) with partial column concentrations retrieved from the TAO-FTS. Two OSIRIS O₃ versions are also compared (Triplet version 3.0 and MART version 2.0) with O₃ retrieved from the TAO-FTS. To accommodate the most coincidences, comparisons are based on monthly mean stratospheric partial columns covering 16-50 km. All coincident monthly means display high correlations: 0.82-0.97. The monthly mean NO₂ at TAO compared with the monthly mean NO₂ from OSIRIS shows an average difference of less than ~3% with standard deviations up to 6%. The OSIRIS NO₂ observations show a multiplicative bias of ~0.8-0.9 and a systematic difference of 5-10% greater then those of the TAO-FTS. O₃ differences are less than 5%, on average, with standard deviations ranging from 2% to 2.8%. There is a pronounced multiplicative bias of OSIRIS compared with the TAO-FTS ranging from 0.55 to 0.73. The systematic O₃ differences are less than 5% larger for OSIRIS. These small differences meet the standards outlined in the Integrated Global Observing Strategy and confirm the quality of the OSIRIS data for studying stratospheric ozone and nitrogen chemistry.PACS{ 92.60.hd, 92.60.Ry, 92.70.Cp, 93.30.Hf

Les concentrations stratosphériques de NO₂ et de O₃, recouvrées des mesures de lumière solaire diffusée par le limbe terrestre à l'aide du spectrographe optique et de l'imageur infrarouge (OSIRIS), sont comparées avec des observations faites par le spectromètre infrarouge à transformée de Fourier de l'Observatoire Atmosphérique de Toronto (TAO-FTS). Les résultats de deux versions du code d'analyse OSIRIS NO₂ (DOAS v3.0 et MART v2,0) sont comparées avec des concentrations en colonnes partielles obtenues de TAO-FTS. Nous comparons aussi deux versions de OSIRIS O₃ (version triplet 3,0 et MART v2,0) avec les résultats de TAO-FTS. Afin d'améliorer le recouvrement des mesures, les comparaisons sont basées sur des moyennes mensuelles de colonnes stratosphériques partielles entre 16 et 50 km. Les moyennes mensuelles coïcindentes montrent un haut taux de corrélation de 0.82-0.97. La moyenne mensuelle du NO₂ au TAO comparée à la moyenne mensuelle de OSIRIS montre une différence moyenne de moins de 3 % avec un écart type de 6 %. Les observations NO₂ de OSIRIS montrent un biais multiplicatif de ~0.8-0.9 et une différence systématique de 5-10 % plus grande que celles du TAO-FTS. Les différences systématiques des mesures de O₃ de OSIRIS sont plus grandes par moins de 5 %. Ces petites différences rencontrent les critères esquissés dans le Global Observing Strategy et confirment la qualité des données de OSIRIS dans l'étude de la chimie stratosphérique de l'ozone et du bioxyde d'azote.[Traduit par la Rédaction]

Document Type: Research article

Publication date: 2007-11-01

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