New formation and fate of Isoprene SOA markers revealed by field data-constrained modeling

Autor: Jie Zhang, Junyi Liu, Xiang Ding, Xiao He, Tianle Zhang, Mei Zheng, Minsu Choi, Gabriel Isaacman-VanWertz, Lindsay Yee, Haofei Zhang, Pawel Misztal, Allen H. Goldstein, Alex B. Guenther, Sri Hapsari Budisulistiorini, Jason D. Surratt, Elizabeth A. Stone, Manish Shrivastava, Dui Wu, Jian Zhen Yu, Qi Ying
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: npj Climate and Atmospheric Science, Vol 6, Iss 1, Pp 1-8 (2023)
Druh dokumentu: article
ISSN: 2397-3722
92835880
DOI: 10.1038/s41612-023-00394-3
Popis: Abstract Particulate 2-methyltetrols (2-MT) and 2-methylglyceric acid (2-MG) are typically used to indicate the abundance of isoprene-derived secondary organic aerosols (SOA). However, their formation and fate are not fully understood. In this study, we showed that particulate 2-MT and 2-MG collected at multiple monitoring sites under a wide range of atmospheric and emission conditions, with concentrations spanning six orders of magnitudes, are well reproduced with an expanded isoprene-SOA scheme implemented into the Community Multiscale Air Quality (CMAQ) model. The scheme considers their three-phase (gas-aqueous-organic phase) partitioning, formation from acid-driven multiphase reactions, and degradation by OH radicals in the gas and aqueous phases. The model results reveal that a non-aqueous formation pathway or direct biogenic emission is needed to supplement the commonly assumed acid-driven multiphase reaction process to explain the observed 2-MT concentrations. This missing pathway contributes to 20–40% of 2-MT in areas with aerosol pH
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