ACP Atmospheric Chemistry and Physics ACP Atmos. Chem. Phys. 1680-7324 Copernicus Publications Göttingen, Germany 10.5194/acp-14-2923-2014 Measurements of total hydroxyl radical reactivity during CABINEX 2009 – Part 1: field measurements Hansen R. F. https://orcid.org/0000-0003-4455-7161 11 2 1 Griffith S. M. 3 2 Dusanter S. 3 4 5 Rickly P. S. 2 3 Stevens P. S. https://orcid.org/0000-0001-9899-4215 3 2 1 Bertman S. B. 6 Carroll M. A. 7 8 Erickson M. H. 9 Flynn J. H. 10 Grossberg N. 10 Jobson B. T. 9 Lefer B. L. https://orcid.org/0000-0001-9520-5495 10 Wallace H. W. 9 Department of Chemistry, Indiana University, Bloomington, IN, USA Center for Research in Environmental Science, Indiana University, Bloomington, IN, USA School of Public and Environmental Affairs, Indiana University, Bloomington, IN, USA Mines Douai, CE, F59508, Douai, France Université Lille Nord de France, 59000, Lille, France Department of Chemistry, Western Michigan University, Kalamazoo, MI, USA Department of Chemistry, University of Michigan, Ann Arbor, MI, USA Department of Atmospheric, Oceanic, and Space Sciences, University of Michigan, Ann Arbor, MI, USA Department of Civil and Environmental Engineering, Washington State University, Pullman, WA, USA Department of Earth and Atmospheric Sciences, University of Houston, Houston, TX, USA now at: School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK 21 03 2014 14 6 2923 2937 Copyright: © 2014 R. F. Hansen et al. 2014 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://acp.copernicus.org/articles/14/2923/2014/acp-14-2923-2014.html The full text article is available as a PDF file from https://acp.copernicus.org/articles/14/2923/2014/acp-14-2923-2014.pdf

Total hydroxyl radical (OH) reactivity was measured at the PROPHET (Program for Research on Oxidants: PHotochemistry, Emissions, and Transport) forested field site in northern Michigan during the 2009 Community Atmosphere–Biosphere INteraction EXperiment (CABINEX). OH reactivity measurements were made with a turbulent-flow reactor instrument at three heights from the forest floor above (21 and 31 m) and below (6 m) the canopy at three different time periods during the CABINEX campaign. In addition to total OH reactivity measurements, collocated measurements of volatile organic compounds (VOCs), inorganic species, and ambient temperature were made at the different heights. These ancillary measurements were used to calculate the total OH reactivity, which was then compared to the measured values. Discrepancies between the measured and calculated OH reactivity, on the order of 1–24 s<sup>−1</sup>, were observed during the daytime above the canopy at the 21 and 31 m heights, as previously reported for this site. The measured OH reactivity below the canopy during the daytime was generally lower than that observed above the canopy. Closer analysis of the measurements of OH reactivity and trace gases suggests that the missing OH reactivity could come from oxidation products of VOCs. These results suggest that additional unmeasured trace gases, likely oxidation products, are needed to fully account for the OH reactivity measured during CABINEX.

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