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Publication of the Paper “Sensitivity study of the instrumental temperature corrections on Brewer total ozone column measurements”

 

The scientific paper “Sensitivity study of the instrumental temperature corrections on Brewer total ozone column measurements” has been published in Atmospheric Measurement Techniques Journal after the public discussion.

In this paper, we report on a comparative study of the Brewer spectrophotometer temperature coefficients retrieval procedures. The work has been coordinated by the Regional Brewer Calibration Center for Europe (RBCC-E / AEMET), and we used measurements performed at the PTB and Kipp & Zonen facilities. 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, which is usually characterized using two different retrieval procedures, based on laboratory measurements in a thermal chamber, and on field measurements considering the natural daily temperature variation, using in both cases an internal halogen lamp. In this work we show that both methods are equivalents with differences below 0.08% in TOC.

This work has been supported by the European Metrology Research Programme (EMRP) within the joint research project ENV59 "Traceability for atmospheric total column ozone" (ATMOZ). Furthermore data from the Eubrewnet Brewer Network have been used.

Reference:

Berjón, A., Redondas, A., Sildoja, M.-M., Nevas, S., Wilson, K., León-Luis, S. F., el Gawhary, O., and Fountoulakis, I.: Sensitivity study of the instrumental temperature corrections on Brewer total ozone column measurements, Atmos. Meas. Tech., 11, 3323-3337, https://doi.org/10.5194/amt-11-3323-2018, 2018.

 

Figure 1: From left to right, Saulius Nevas, Alberto Berjón, Meelis  Sildoja & Alberto Redondas  when the setup of the first experiment were done, PTB January 2016

 

Figure 2: From left to right, Saulius Nevas, Alberto Berjón, Meelis  Sildoja & Alberto Redondas  reflections on the chamber

 

Figure 3: Meelis programing the environmental chamber

 

Figure 4: Details of the custom connectors adapted to be used on the chamber

 

Figure 5: Detail of the input optic of the monitors inside the chamber

 

Figure 6: Second chamber experiment, February 2017

 

Figure 7: Detail of the setup of the second chamber experiment at PTB

 

Figure 8: From left to right, Sergio León, Alberto Redondas  & Meelis Sildoja during the setup of the experiment

 

 

Figure 9 : Two views of the  Brewer#185  at the chamber, the light is focused on the direct optics of the spectrometer.

 

Figure 10: The brewer spectrometer without the cover, inside of the chamber  during the experiment.

 

 

Figure  11 : The brewer spectrometer without the cover, inside of the chamber,  one of the last experiments at PTB