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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/amt-2019-168
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2019-168
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 13 Sep 2019

Submitted as: research article | 13 Sep 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

An Automated Method for Preparing and Calibrating Electrochemical Concentration Cell (ECC) Ozonesondes

Francis J. Schmidlin1 and Bruno A. Hoegger2 Francis J. Schmidlin and Bruno A. Hoegger
  • 1NASA/GSFC/Wallops Flight Facility; Wallops Island, Va. 23337
  • 2Bruno Hoegger Scientific Consulting; Marly, Switzerland CH1723

Abstract. In contrast to the legacy manual method used to prepare, condition, and calibrate the Electrochemical Concentration Cell (ECC) ozonesonde an automated digital calibration bench similar to one developed by MeteoSwiss at Payerne, Switzerland was established at NASA's Wallops Flight Facility and providesreference measurements of the same ozone partial pressure as measured by the ECC. The purpose of an automated system is to condition and calibrate ECC cells before launching on a balloon. Operation of the digital calibration bench is simple and real-time graphs and summaries are available to the operator; all information is archived. The parameters of interest include ozone partial pressure, airflow, temperature, background current, response, and time (real and elapsed). ECC cells, prepared with 1.0 percent solution of potassium iodide (KI) and full buffer, show increasing partial pressure values when compared to the reference as partial pressures increase. Differences of approximately 5–6 percent are noted at 200 nb. Additional tests with different concentrations revealed the Science Pump Corp (SPC) 6A ECC with 0.5 percent KI solution and one-half buffer agreed closer to the reference than the 1.0 percent cells, this is in agreement with results of multi-sonde comparisons obtained during BESOS. The information gained from the automated system allowsa compilation of ECC cell characteristics, as well as calibrations. The digital calibration bench is recommended for ECC studies asit conserves resources.

Francis J. Schmidlin and Bruno A. Hoegger
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Status: open (until 08 Nov 2019)
Status: open (until 08 Nov 2019)
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Francis J. Schmidlin and Bruno A. Hoegger
Francis J. Schmidlin and Bruno A. Hoegger
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Short summary
Preparation of the Electrochemical Concentration Cell (ECC) ozonesonde involves many facets. The system at MeteoSwiss, Payerne,stoked our interest to fabricate a similar system at NASA. Except for initial ECC preparation, all functions are automatic, requiring less labor as well as providing a digital data history of each ECC. Building the Digital Calibration Bench took months with talent from electronic personnel, followed by many tests of functionality. Technology improvements are necessary.
Preparation of the Electrochemical Concentration Cell (ECC) ozonesonde involves many facets. The...
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