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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-2017-258
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
01 Aug 2017
Review status
This discussion paper is a preprint. A revision of the manuscript is under review for the journal Atmospheric Measurement Techniques (AMT).
Development of an instrument for direct ozone production rate measurements: Measurement reliability and current limitations
Sofia Sklaveniti1,2, Nadine Locoge1, Philip S. Stevens2,3, Ezra Wood4,5, Shuvashish Kundu4, and Sébastien Dusanter1 1IMT Lille Douai, Univ. Lille, SAGE - Département Sciences de l'Atmosphère et Génie de l'Environnement, 59000 Lille, France
2School of Pu blic and Environmental Affairs, Indiana University, Bloomington, IN 47405, USA
3Department of C hemistry, Indiana University, Bloomington, IN, USA
4Department of Chemistry, University of Massachusetts, Amherst, MA USA
5Department of Chemistry, Drexel University, Philadelphia, PA, USA
Abstract. Ground level ozone (O3) is an important pollutant that affects both global climate change and regional air quality, with the latter linked to detrimental effects on both human health and ecosystems. Ozone is not directly emitted in the atmosphere but is formed from chemical reactions involving volatile organic compounds (VOCs), nitrogen oxides (NOx = NO+NO2) and sunlight. The photochemical nature of ozone makes the implementation of reduction strategies challenging and a good understanding of its formation chemistry is fundamental in order to develop efficient strategies of ozone reduction from mitigation measures of primary VOCs and NOx emissions.

An instrument for direct measurements of ozone production rates (OPR) was developed and deployed in the field as part of the IRRONIC (Indiana Radical, Reactivity and OzoNe production InterComparison) field campaign. The OPR instrument is based on the principle of the previously published MOPS instrument (Measurement of Ozone Production Sensor) but using a different sampling design made of quartz flow tubes and a different Ox (O3 and NO2) conversion/detection scheme composed of an O3-to-NO2 conversion unit and a Cavity Attenuated Phase Shift (CAPS) NO2 monitor. Tests performed in the laboratory and in the field, together with model simulations of the radical chemistry occurring inside the flow tubes, were used to assess (i) the reliability of the measurement principle and (ii) potential biases associated to OPR measurements.

This publication reports the first field measurements made using this instrument to illustrate its performance. The results showed that a photo-enhanced loss of ozone inside the sampling flow tubes disturb the measurements. This issue needs to be solved to be able to perform accurate ambient measurements of ozone production rates with the instrument described in this study. However, an attempt was made to investigate the OPR sensitivity to NOx by adding NO inside the instrument. This type of investigations does not require measuring ambient OPR but only probing the change in ozone production when NO is added. During IRRONIC, changes in ozone production rates ranging from the limit of detection (3σ) of 6.2 ppbv h−1 up to 20 ppbv h−1 were observed when 6 ppbv of NO was added into the flow tubes.


Citation: Sklaveniti, S., Locoge, N., Stevens, P. S., Wood, E., Kundu, S., and Dusanter, S.: Development of an instrument for direct ozone production rate measurements: Measurement reliability and current limitations, Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2017-258, in review, 2017.
Sofia Sklaveniti et al.
Sofia Sklaveniti et al.
Sofia Sklaveniti et al.

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Short summary
Ground level ozone is a pollutant that affects both global climate change and regional air quality. Its complex formation chemistry makes the implementation of reduction strategies challenging and needs to be well understood to develop efficient strategies. This publication reports the development of an instrument capable of monitoring the ozone formation rate in the atmosphere. Its reliability was tested in the laboratory and in the field and important recommendations are given for improvement.
Ground level ozone is a pollutant that affects both global climate change and regional air...
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