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First Author: CHEN Yuping

This study presents the variation of chemical components in non-refractory submicron aerosols (NR-PM1) measured by Q-ACSM in a coastal city of Southeast China in summer and winter during the years 2017, 2018, and 2020. As we know, long-term data on aerosol chemical composition were scarce in this region. The mass concentration of NR-PM1 decreased evidently, but the chemical composition of NR-PM1 showed a minor variation with OA increased and NO3 decreased over the years. PMF/ME-2 models were performed to identify OA factors resolving POA, less oxidized OOA (LO-OOA), and more oxidized OOA (MO-OOA) in this study. Secondary components made dominant contributions of 85.1%–90.7% to NR-PM1, and OOA became more important in aerosols with time. The SOR, NOR, and MO-OOA/LO-OOA ratio as a function of LWC and Ox, combined with the diurnal variation of secondary aerosols (SAs), were performed to explore the main formation mechanism of NO3, SO4, and OOA. The results indicate that SO4 and OOA factors in summer were mainly affected by photochemical reactions, while the characteristics and the main formation pathways of NO3 and OOA factors in winter varied largely across the different years. The oxidized degree of OA had elevated in 2020 compared to 2017 and 2018 as the f44 (ratio of m/z 44 to total signal) of OA increased. Our study on the annual variation of aerosol chemical composition and the dominant formation pathways of secondary components will provide a scientific reference for air quality improvement.

Fig. 1. Monthly average of chemical composition (a) and its proportion (b) in NR-PM1.

Contact the author: XU Lingling; CHEN Jinsheng
Page Number: 119243
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PubYear: September 2022
Volume: 285
The full text link: https://doi.org/10.1016/j.atmosenv.2022.119243