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- Title
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 KORUS-AQ 2016.
- Authors
Sanchez, Dianne; Seco, Roger; Gu, Dasa; Guenther, Alex; Mak, John; Youngjae Lee; Danbi Kim; Joonyoung Ahn; Blake, Don; Herndon, Scott; Daun Jeong; Sullivan, John T.; Mcgee, Thomas; Saewung Kim
- Abstract
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 Korea US 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. The missing OH reactivity most likely comes from VOC oxidation products of both biogenic and anthropogenic origin.
- Subjects
SEOUL (Korea); METROPOLITAN areas; PROTON transfer reactions; FOREST canopies; TRACE gases; MASS spectrometers; VOLATILE organic compounds
- Publication
Atmospheric Chemistry & Physics Discussions, 2020, p1
- ISSN
1680-7367
- Publication type
Article
- DOI
10.5194/acp-2020-174