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Volume 11, issue 6 | Copyright

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

Atmos. Meas. Tech., 11, 3323-3337, 2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 11 Jun 2018

Research article | 11 Jun 2018

Sensitivity study of the instrumental temperature corrections on Brewer total ozone column measurements

Alberto Berjón1,2, Alberto Redondas3,2, Meelis-Mait Sildoja4, Saulius Nevas4, Keith Wilson5, Sergio F. León-Luis3,2, Omar el Gawhary6, and Ilias Fountoulakis7 Alberto Berjón et al.
  • 1University of La Laguna, Department of Industrial Engineering, S.C. de Tenerife, Spain
  • 2Regional Brewer Calibration Center for Europe, Izaña Atmospheric Research Center, Tenerife, Spain
  • 3Agencia Estatal de Meteorología, Izaña Atmospheric Research Center, Spain
  • 4Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany
  • 5Kipp & Zonen BV, Delft, Netherlands
  • 6Dutch Metrology Institute, Delft, Netherlands
  • 7Aristotle University of Thessaloniki, Laboratory of Atmospheric Physics, Thessaloniki, Greece

Abstract. The instrumental temperature corrections to be applied to the ozone measurements by the Brewer spectrophotometers are derived from the irradiance measurements of internal halogen lamps in the instruments. These characterizations of the Brewer spectrophotometers can be carried out within a thermal chamber, varying the temperature from −5 to +45°C, or during field measurements, making use of the natural change in ambient temperature. However, the internal light source used to determine the thermal sensitivity of the instrument could be affected in both methods by the temperature variations as well, which may affect the determination of the temperature coefficients. In order to validate the standard procedures for determining Brewer's temperature coefficients, two independent experiments using both external light sources and the internal halogen lamps have been performed within the ATMOZ Project. The results clearly show that the traditional methodology based on the internal halogen lamps is not sensitive to the temperature-caused changes in the spectrum of the internal light source. The three methodologies yielded equivalents results, with differences in total ozone column below 0.08% for a mean diurnal temperature variation of 10°C.

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Short summary
The Brewer spectrophotometer has been used for decades as reference instrument to retrieve total ozone column (TOC) and for validation of satellite based measurements. This spectrophotometer has a thermal sensitivity already known, which is usually characterized using two different retrieval procedures. In this work, we report on a comparative study of the temperature coefficients retrieval procedures, obtaining differences less that 0.08 % in TOC when using any of the procedures.
The Brewer spectrophotometer has been used for decades as reference instrument to retrieve total...