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Environ Sci Technol

Title:		Contribution of Organic Nitrates to Organic Aerosol over South Korea during KORUS-AQ
Author(s):		Kenagy HS; Romer Present PS; Wooldridge PJ; Nault BA; Campuzano-Jost P; Day DA; Jimenez JL; Zare A; Pye HOT; Yu J; Song CH; Blake DR; Woo JH; Kim Y; Cohen RC;
Address:		"Department of Chemistry, University of California, Berkeley, California 94720, United States. Department of Chemistry, University of Colorado, Boulder, Colorado 80309, United States. Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado 80309, United States. Department of Chemistry, University of California, Berkeley, California 94710, United States. Office of Research and Development, US Environmental Protection Agency, Research Triangle Park, Durham, North Carolina 27709, United States. School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 61105, Republic of Korea. Department of Chemistry, University of California, Irvine, California 92697, United States. Department of Civil and Environmental Engineering, Konkuk University, Seoul 05029, Republic of Korea. Energy, Climate, and Environment (ECE) Program, International Institute for Applied Systems Analysis (IIASA), Laxenburg A-2361, Austria. Department of Earth & Planetary Sciences, University of California, Berkeley CA 94 720, United States"
Journal Title:		Environ Sci Technol
Year:		2021
Volume:		20211206
Issue:		24
Page Number:		16326 - 16338
DOI:		10.1021/acs.est.1c05521
ISSN/ISBN:		1520-5851 (Electronic) 0013-936X (Print) 0013-936X (Linking)
Abstract:		"The role of anthropogenic NO(x) emissions in secondary organic aerosol (SOA) production is not fully understood but is important for understanding the contribution of emissions to air quality. Here, we examine the role of organic nitrates (RONO(2)) in SOA formation over the Korean Peninsula during the Korea-United States Air Quality field study in Spring 2016 as a model for RONO(2) aerosol in cities worldwide. We use aircraft-based measurements of the particle phase and total (gas + particle) RONO(2) to explore RONO(2) phase partitioning. These measurements show that, on average, one-fourth of RONO(2) are in the condensed phase, and we estimate that approximately 15% of the organic aerosol (OA) mass can be attributed to RONO(2). Furthermore, we observe that the fraction of RONO(2) in the condensed phase increases with OA concentration, evidencing that equilibrium absorptive partitioning controls the RONO(2) phase distribution. Lastly, we model RONO(2) chemistry and phase partitioning in the Community Multiscale Air Quality modeling system. We find that known chemistry can account for one-third of the observed RONO(2), but there is a large missing source of semivolatile, anthropogenically derived RONO(2). We propose that this missing source may result from the oxidation of semi- and intermediate-volatility organic compounds and/or from anthropogenic molecules that undergo autoxidation or multiple generations of OH-initiated oxidation"
Keywords:		Aerosols/analysis *Air Pollutants/analysis Cities Nitrates/analysis *Volatile Organic Compounds absorptive partitioning theory aerosols nitrogen oxides organic aerosol organic nitrates particulate matter urban air quality volatile organic compounds;
Notes:		"MedlineKenagy, Hannah S Romer Present, Paul S Wooldridge, Paul J Nault, Benjamin A Campuzano-Jost, Pedro Day, Douglas A Jimenez, Jose L Zare, Azimeh Pye, Havala O T Yu, Jinhyeok Song, Chul H Blake, Donald R Woo, Jung-Hun Kim, Younha Cohen, Ronald C eng EPA999999/ImEPA/Intramural EPA/ Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. 2021/12/07 Environ Sci Technol. 2021 Dec 21; 55(24):16326-16338. doi: 10.1021/acs.est.1c05521. Epub 2021 Dec 6"