Contributions to OH reactivity from unexplored volatile organic compounds measured by PTR-ToF-MS – a case study in a suburban forest of the Seoul metropolitan area during the Korea–United States Air Quality Study (KORUS-AQ) 2016

Sanchez, Dianne; Seco, Roger; Gu, Dasa; Guenther, Alex; Mak, John; Lee, Youngjae; Kim, Danbi; Ahn, Joonyoung; Blake, Don; Herndon, Scott; Jeong, Daun; Sullivan, John T.; Mcgee, Thomas; Park, Rokjin; Kim, Saewung

We report OH reactivity observations by a chemical ionization mass spectrometer–comparative reactivity method (CIMS-CRM) instrument in a suburban forest of the Seoul metropolitan area (SMA) during the Korea–United States Air Quality Study (KORUS-AQ 2016) from mid-May to mid-June of 2016. A comprehensive observational suite was deployed to quantify reactive trace gases inside of the forest canopy including a high-resolution proton transfer reaction time-of-flight mass spectrometer (PTR-ToF-MS). An average OH reactivity of inline-formula30.7±5.1inline-formulas−1 was observed, while the OH reactivity calculated from CO, inline-formulaNO+NO2 (NOinline-formulax), ozone (inline-formulaO3), sulfur dioxide (inline-formulaSO2), and 14 volatile organic compounds (VOCs) was inline-formula11.8±1.0inline-formulas−1. An analysis of 346 peaks from the PTR-ToF-MS accounted for an additional inline-formula6.0±2.2inline-formulas−1 of the total measured OH reactivity, leaving 42.0 % missing OH reactivity. A series of analyses indicate that the missing OH reactivity most likely comes from VOC oxidation products of both biogenic and anthropogenic origin.

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Sanchez, Dianne / Seco, Roger / Gu, Dasa / et al: Contributions to OH reactivity from unexplored volatile organic compounds measured by PTR-ToF-MS – a case study in a suburban forest of the Seoul metropolitan area during the Korea–United States Air Quality Study (KORUS-AQ) 2016. 2021. Copernicus Publications.

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