Abstract
The results of an intercomparison campaign of eight different long path UV-visible DOAS instruments measuring NO2, O3 and SO2 concentrations in a moderately polluted urban site are presented. For effective optical path lengths of 230 and 780 m the overall spread of these measurements (±1σ) are 5×1010, 6×1010 and 1×1010 molec·cm-3 (2.0, 2.4, and 0.4 ppb) for these molecules respectively when all instruments used a common set of absorption cross sections. The remaining differences are not completely random and the systematic differences are attributed to the different retrieval methods used for each instrument.
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Camy-Peyret, C., Bergovist, B., Galle, B. et al. Intercomparison of instruments for tropospheric measurements using differential optical absorption spectroscopy. J Atmos Chem 23, 51–80 (1996). https://doi.org/10.1007/BF00058704
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DOI: https://doi.org/10.1007/BF00058704