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

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 comprehen...

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Bibliographic Details
Published in:Atmospheric chemistry and physics 2021-04, Vol.21 (8), p.6331-6345
Main Authors: 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
Format: Article
Language:English
Subjects:
Air pollution
Air quality
Anthropogenic factors
Carbon
Case studies
Comparative analysis
Datasets
Emissions
Forest canopy
Forests
Gases
Ionization
Mass spectrometry
Metropolitan areas
Nitrogen compounds
Nitrogen dioxide
Organic compounds
Oxidation
Oxides
Ozone
Plant cover
Reaction time
Reactivity
Sulfur
Sulfur compounds
Sulfur dioxide
Sulphur
Sulphur dioxide
Trace gases
VOCs
Volatile organic compounds
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Summary: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 30.7±5.1 s−1 was observed, while the OH reactivity calculated from CO, NO+NO2 (NOx), ozone (O3), sulfur dioxide (SO2), and 14 volatile organic compounds (VOCs) was 11.8±1.0 s−1. An analysis of 346 peaks from the PTR-ToF-MS accounted for an additional 6.0±2.2 s−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.
ISSN:1680-7324
1680-7316
1680-7324
DOI:10.5194/acp-21-6331-2021