Preprints
https://doi.org/10.5194/amt-2022-11
https://doi.org/10.5194/amt-2022-11

  11 Jan 2022

11 Jan 2022

Review status: this preprint is currently under review for the journal AMT.

Comment on “Comparison of ozone measurement methods in biomass burning smoke: an evaluation under field and laboratory conditions” (Long et al. 2021)

Noah Bernays1, Daniel Jaffe1,2, Irina Petropavlovskikh3, and Peter Effertz4 Noah Bernays et al.
  • 1School of STEM, University of Washington, Bothell, WA 98011, U.S.A.
  • 2Department of Atmospheric Sciences, University of Washington, Seattle, WA 98195, U.S.A.
  • 3NOAA Global Monitoring Laboratory, Boulder, Colorado 80305, U.S.A.
  • 4CIRES, University of Colorado, Boulder, CO 80309, U.S.A.

Abstract. Long et al (2021) conducted a detailed study of possible interferents in measurements of surface O3 by UV spectroscopy, which measures the UV transmission in ambient and O3 scrubbed air. While we appreciate the careful work done in this analysis, there were several omissions and, in one case, the type of scrubber used was mis-identified as manganese dioxide (MnO2), when in fact it was manganese chloride (MnCl2). This misidentification led to the erroneous conclusion that all UV-based O3 instruments employing solid-phase catalytic scrubbers exhibit significant positive artifacts, whereas previous research found this not to be the case when employing MnO2 scrubber types. While the Long study, and our results, confirm the substantial bias in instruments employing an MnCl2 scrubber, a replication of the earlier work with an MnO2 scrubber type and no humidity correction is needed.

Noah Bernays et al.

Status: open (until 16 Feb 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Noah Bernays et al.

Noah Bernays et al.

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Short summary
Ozone is an important pollutant that impacts millions of people worldwide. It is therefore essential to understand our ability to accurately measure it. A recent surge in wildfire activity in the U.S. has resulted in significant enhancements in ozone concentration. However given the nature of wildfire smoke, there are questions about our ability to accurately measure ozone. In this comment, we discuss previous to understand possible biases and challenges in UV measurements of ozone.