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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

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https://doi.org/10.5194/amt-2017-406
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
13 Nov 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).
Characterization of the instrument temperature dependence of 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 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 and Berlin, Germany
5Kipp & Zonen BV, Delft, the Netherlands
6Dutch Metrology Institute, Delft, the Netherlands
7Aristotle University of Thessaloniki, Laboratory of Atmospheric Physics, Thessaloniki, Greece
Abstract. The instrumental temperature correction to be applied to the ozone measurements by the Brewer spectrophotometers is derived from measurements of the irradiance from an internal halogen lamp in the instrument. These characterisations of the Brewer instruments can be carried out within a thermal chamber, varying the temperature from −5 °C 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 lamps have been performed within the ATMOZ Project. The results clearly show that the traditional methodology based on the internal lamps is not affected by possible temperature effects on the internal lamps. The three methodologies yielded equivalents results, with differences in total ozone column below 0.08 % for a mean diurnal temperature variation of 10 °C.

Citation: Berjón, A., Redondas, A., Sildoja, M.-M., Nevas, S., Wilson, K., León-Luis, S. F., El Gawhary, O., and Fountoulakis, I.: Characterization of the instrument temperature dependence of Brewer total ozone column measurements, Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2017-406, in review, 2017.
Alberto Berjón et al.
Alberto Berjón et al.
Alberto Berjón et al.

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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 both procedures.
The Brewer spectrophotometer has been used for decades as reference instrument to retrieve total...
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