Spectroscopic measurements of O
3 and NO
2 atmospheric content: Improvements to ground-based method and comparison with the data of satellite observations
D.V. Ionov, Yu.M. Timofeyev, A.V. Poberovskii
Saint Petersburg State University, 1, Ulyanovskaya str., Petrodvorets, St. Petersburg, 198504, Russia
Keywords: DOAS-измерения, содержание O
в атмосфере, содержание NO
в атмосфере, DOAS measurements, O
atmospheric content, NO
atmospheric content
Abstract
The results of daily observations of O
3 and NO
2 atmospheric total conent around St.Petersburg, retrieved from the automatic ground-based measurements of zenith-sky scattered visible solar radiation, are presented. The measurements acquired in 2009-2013 are compared with the data of satellite observations by the GOME (ERS-2), SCIAMACHY (ENVISAT) and OMI (AURA) instruments. Investigation of the disagreement revealed between the data of satellite and ground-based measurements allowed us to improve the ground-based method (DOAS technique) and reduce the average difference down to ~ 2 and ~ 20% for O
3 и NO
2 content, respectively. Remaining differences may be further reduced if the seasonal variability of calculated air mass factors is taken into account in the ground-based method.
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