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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Volume 11, issue 9 | Copyright

Special issue: Quadrennial Ozone Symposium 2016 – Status and trends...

Atmos. Meas. Tech., 11, 5105-5123, 2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 07 Sep 2018

Research article | 07 Sep 2018

Examination on total ozone column retrievals by Brewer spectrophotometry using different processing software

Anna Maria Siani1, Francesca Frasca2, Francesco Scarlatti3, Arianna Religi4, Henri Diémoz5, Giuseppe R. Casale1, Massimiliano Pedone6, and Volodya Savastiouk7 Anna Maria Siani et al.
  • 1Department of Physics, Sapienza Università di Roma, Rome, Italy
  • 2Department of Earth Sciences, Sapienza Università di Roma, Rome, Italy
  • 3independent researcher
  • 4Institute of Services Science, University of Geneva, Geneva, Switzerland
  • 5Aosta Valley Regional Environmental Protection Agency (ARPA), Saint-Christophe, Italy
  • 6Infosapienza Settore per i Sistemi Centrali e per l'Office Automation, Sapienza Università di Roma, Rome, Italy
  • 7International 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 for studies on the assessment of short- and long-term atmospheric changes and their impact on the terrestrial ecosystem. In particular, ground-based observations represent a valuable tool for validating satellite-derived products. To our knowledge, details about software packages for processing Brewer spectrophotometer measurements and for retrieving the TOC are seldom specified in studies using such datasets. The sources of the differences among retrieved TOCs from the Brewer instruments located at the Italian stations of Rome and Aosta, using three freely available codes (Brewer Processing Software, BPS; O3Brewer software; and European Brewer Network (EUBREWNET) level 1.5 products) are investigated here. Ground-based TOCs are also compared with Ozone Monitoring Instrument (OMI) TOC retrievals used as an independent dataset since no other instruments near the Brewer sites are available.

The overall agreement of the BPS and O3Brewer TOC data with EUBREWNET data is within the estimated total uncertainty in the retrieval of total ozone from a Brewer spectrophotometer (1%). However, differences can be found depending on the software in use. Such differences become larger when the instrumental sensitivity exhibits a fast and dramatic drift which can affect the ozone retrievals significantly. Moreover, if daily mean values are directly generated by the software, differences can be observed due to the configuration set by the users to process single ozone measurement and the rejection rules applied to data to calculate the daily value.

This work aims to provide useful information both for scientists engaged in ozone measurements with Brewer spectrophotometers and for stakeholders of the Brewer data products available on Web-based platforms.

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Short summary
Total ozone columns (TOCs) 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 TOC retrievals depends on the algorithm for calculating the standard lamp correction.
Total ozone columns (TOCs) measured by Brewer spectrophotometers located at Rome and Aosta...