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Published July 2018 | Supplemental Material
Journal Article Open

Modeling biogenic secondary organic aerosol (BSOA) formation from monoterpene reactions with NO_3: A case study of the SOAS campaign using CMAQ

Abstract

Monoterpenes react with nitrate radicals (NO3), contributing substantially to nighttime organic aerosol (OA) production. In this study, the role of reactions of monoterpenes + NO_3 in forming biogenic secondary organic aerosol (BSOA) was examined using the Community Multiscale Air Quality (CMAQ) model, with extended emission profiles of biogenic volatile organic compounds (BVOCs), species-specific representations of BSOA production from individual monoterpenes and updated aerosol yields for monoterpene + NO_3. The model results were compared to detailed measurements from the Southern Oxidants and Aerosol Study (SOAS) at Centreville, Alabama. With the more detailed model, monoterpene-derived BSOA increased by ∼1 μg m^(−3) at night, accounting for one-third of observed less-oxidized oxygenated OA (LO-OOA), more closely agreeing with observations (lower error, stronger correlation). Implementation of a multigenerational oxidation approach resulted in the model capturing elevated OA episodes. With the aging model, aged semi-volatile organic compounds (ASVOCs) contributed over 60% of the monoterpene-derived BSOA, followed by SOA formation via nitrate radical chemistry, making up to 34% of that formed at night. Among individual monoterpenes, β-pinene and limonene contributed most to the monoterpene-derived BSOA from nighttime reactions.

Additional Information

© 2018 Elsevier Ltd. Received 13 December 2017, Revised 16 March 2018, Accepted 20 March 2018, Available online 21 March 2018. We gratefully acknowledge the financial support from the National Science and Technology Pillar Program of China (Grant No. 2014BAC21B02 and 2014BAC06B02) and Natural Science Foundation of China (Grant No. 41175102). This work was also funded, in part, by U.S. EPA Grant Number R834799, Phillips 66, the NOAA CPO Award NA10OAR4310102 and the US EPA STAR grant RD-835410. NLN, CB, and LX acknowledge support from EPA STAR grant RD-83540301 and NSF grant 1555034. AN, LX, and NLN acknowledge support from NSF grant 1242258. Its contents are solely the responsibility of the grantee and do not necessarily represent the official views of the US government. Further, US government does not endorse the purchase of any commercial products or services mentioned in the publication. We also acknowledge Eric Edgerton for his assistance, Southern Company, and the Electric Power Research Institute (EPRI) for their support of work central to this research, including support of the SEARCH network. We are grateful to William H. Brune for OH radical measurement.

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August 21, 2023
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October 18, 2023