Preprints
https://doi.org/10.5194/amt-2021-354
https://doi.org/10.5194/amt-2021-354

  29 Oct 2021

29 Oct 2021

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

Ozone Reactivity Measurement of Biogenic Volatile Organic Compound Emissions

Detlev Helmig1,2, Alex Guenther3, Jacques Hueber1, Ryan Daly1, Jeong-Hoo Park1, Anssi Liikanen4, and Arnaud P. Praplan4 Detlev Helmig et al.
  • 1Institute of Arctic and Alpine Research, University of Colorado, Boulder, CO 80309, USA
  • 2Boulder Atmosphere Innovation Research LLC, Boulder, CO 80305, USA
  • 3University of California Irvine, CA, USA
  • 4Atmospheric Research Composition, Finnish Meteorological Institute, 00101 Helsinki, Finland

Abstract. Previous research on atmospheric chemistry in the forest environment has shown that the total reactivity by biogenic volatile organic compound (BVOC) emission is not well considered in for-est chemistry models. One possible explanation for this discrepancy is the unawareness and ne-glect of reactive biogenic emission that have eluded common monitoring methods. This ques-tion motivated the development of a total ozone reactivity monitor (TORM) for the direct de-termination of the reactivity of foliage emissions. Emissions samples drawn from a vegetation branch enclosure experiment are mixed with a known and controlled amount of ozone (e.g. re-sulting in 100 ppb of ozone) and directed through a temperature-controlled glass flow reactor to allow reactive biogenic emissions to react with ozone during the approximately 2-minute residence time in the reactor. The ozone reactivity is determined from the difference in the ozone mole fraction before and after the reaction vessel. An inherent challenge of the experi-ment is the influence of changing water vapor in the sample air on the ozone signal. A com-mercial UV absorption ozone monitor was modified to directly determine the ozone differential with one instrument and sample air was drawn through Nafion dryer membrane tubing. These two modifications significantly reduced errors associated with the determination of the reacted ozone compared to determining the difference from two individual measurements and errors from interferences from water vapor, resulting in a much improved and sensitive determina-tion of the ozone reactivity. This paper provides a detailed description of the measurement de-sign, the instrument apparatus, and its characterization. Examples and results from field de-ployments demonstrate the applicability and usefulness of the TORM.

Detlev Helmig et al.

Status: open (until 21 Dec 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2021-354', Anonymous Referee #1, 06 Dec 2021 reply

Detlev Helmig et al.

Detlev Helmig et al.

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Short summary
This research demonstrates a new method for determination of the chemical reactivity of organic volatile compounds that are emitted from the leaves and needles of trees. These measurements allow elucidating if and how much of these emissions and their associated reactivity are captured and quantified by currently applicable chemical analysis methods.