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https://doi.org/10.5194/amt-2017-441
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
12 Jan 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).
Examination on total ozone column retrievals by Brewer spectrophotometry using different processing software
Anna Maria Siani1, Francesco Scarlatti2, Arianna Religi3, Henri Diémoz4, Giuseppe R. Casale1, Massimiliano Pedone5, and Volodya Savastiouk6 1Department of Physics, Sapienza Università di Roma, Rome, Italy
2independent scientist
3Institute of Services Science, University of Geneva, Geneva, Switzerland
4Aosta Valley Regional Environmental Protection Agency (ARPA), Saint-Christophe, Italy
5Infosapienza Settore per i Sistemi Centrali e per l'Office Automation, Sapienza Università di Roma, Rome, Italy
6International Ozone Services Inc., Toronto, Ontario, Canada
Abstract. The availability of long-term records of the total ozone content (TOC) represents a valuable source of information in studies on the assessment of short and long-term changes and their impact on the terrestrial ecosystem. In addition, ground-based observations represent a valuable tool to validate satellite-derived products. To our knowledge, details about processing software packages to retrieve the TOC from Brewer spectrophotometer measurements are seldom specified in studies concerning such datasets, although some discrepancies can arise from the use of different algorithms and implementations. The deviations among retrieved TOCs from the Brewer instruments located at Rome and Aosta (Italy), using different processing software (Brewer Processing Software, O3Brewer software and EUBREWNET products (Level 1.5) are investigated. Ground-based TOCs are also compared with the Ozone Monitoring Instrument (OMI) TOC retrievals used as an independent dataset since no other instruments near the Brewer sites, are available.

Although the overall agreement of the BPS and O3Brewer TOC data with EUBREWNET data is clearly very good (as expected) and in most cases within the Brewer declared uncertainty less than 2 %, it is worth noticing that slight differences have been seen depending on the software in use. Such differences become larger when the instrumental sensitivity exhibits a long-term drift and even in short-term episodes due to the different algorithm for the standard lamp correction. This work aims to provide useful information both for scientists engaged in ozone measurements with Brewer spectrophotometry and for stakeholders of the Brewer data products available at web-based platforms.


Citation: Siani, A. M., Scarlatti, F., Religi, A., Diémoz, H., Casale, G. R., Pedone, M., and Savastiouk, V.: Examination on total ozone column retrievals by Brewer spectrophotometry using different processing software, Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2017-441, in review, 2018.
Anna Maria Siani et al.
Anna Maria Siani et al.
Anna Maria Siani et al.

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Short summary
Total ozone columns (TOC) measured by Brewer spectrophotometers located at Rome and Aosta (Italy), were calculated using different processing software packages and the differences in the TOC retrievals are investigated. Large differences in TOC retrievals can be experienced when the instrumental sensitivity exhibits a long-term drift. The variability in TOCs retrievals depends on the algorithm to calculate the standard lamp correction.
Total ozone columns (TOC) measured by Brewer spectrophotometers located at Rome and Aosta...
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