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.

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Date: Apr. 27, 2021
From: Atmospheric Chemistry and Physics(Vol. 21, Issue 8)
Publisher: Copernicus GmbH
Document Type: Case study; Brief article
Length: 216 words

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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 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.sup.-1 was observed, while the OH reactivity calculated from CO, NO+NO.sub.2 (NO.sub.x ), ozone (O.sub.3 ), sulfur dioxide (SO.sub.2 ), and 14 volatile organic compounds (VOCs) was 11.8±1.0 s.sup.-1 . An analysis of 346 peaks from the PTR-ToF-MS accounted for an additional 6.0±2.2 s.sup.-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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Gale Document Number: GALE|A659813517