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Atmosphere 2018, 9(10), 372;

PAN–Precursor Relationship and Process Analysis of PAN Variations in the Pearl River Delta Region

1,2,* , 3
School of Atmospheric Sciences, Sun Yat-sen University, Guangzhou 510275, China
Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Sun Yat-sen University, Guangzhou 510275, China
Department of Civil and Environmental Engineering, Hong Kong Polytechnic University, Hong Kong 999077, China
Institute for Environmental and Climate Research, Jinan University, Guangzhou 510000, China
Institute of Tropical and Marine Meteorology, Guangdong Provincial Key Laboratory of Regional Numerical Weather Prediction, China Meteorological Administration, Guangzhou 510000, China
School of Atmospheric Sciences, Nanjing University, Nanjing 210000, China
Authors to whom correspondence should be addressed.
Received: 3 July 2018 / Revised: 17 September 2018 / Accepted: 21 September 2018 / Published: 25 September 2018
(This article belongs to the Special Issue Storms, Jets and Other Meteorological Phenomena in Coastal Seas)
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Peroxy acetyl nitrate (PAN) is an important photochemical product formed from the reactions between volatile organic compounds (VOCs) and nitrogen oxides (NOx) under sunlight. In this study, a field measurement was conducted at a rural site (the backgarden site, or BGS) of the Pearl River Delta (PRD) region in 2006, with the 10 min maximum PAN mixing ratios of 3.9 ppbv observed. The factors influencing the abundance of PAN at the BGS site was evaluated by the process analysis through the Weather Research and Forecasting-Community Multiscale Air Quality (WRF-CMAQ) model. The results suggested that the increase of PAN abundance at the BGS site was mainly controlled by the gas-phase chemistry, followed by vertical transport, while its loss was modulated mainly by dry deposition and horizontal transport. As the dominant important role of gas-phase chemistry, to provide detailed information on the photochemical formation of PAN, a photochemical box model with near-explicit chemical mechanism (i.e., the master chemical mechanism, MCM) was used to explore the relationship of photochemical PAN formation with its precursors based on the measured data at the BGS site. It was found that PAN formation was VOC-limited at the BGS site, with the oxidation of acetaldehyde the most important pathway for photochemical PAN production, followed by the oxidation and photolysis of methylglyoxal (MGLY). Among all the primary VOC precursors, isoprene and xylenes were the main contributors to PAN formation. Overall, our study provides new insights into the PAN photochemical formation and its controlling factors, and highlighted the importance of gas chemistry on the PAN abundance in the PRD region. View Full-Text
Keywords: peroxy acetyl nitrate; process analysis; relationship; pearl river delta peroxy acetyl nitrate; process analysis; relationship; pearl river delta

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Yuan, J.; Ling, Z.; Wang, Z.; Lu, X.; Fan, S.; He, Z.; Guo, H.; Wang, X.; Wang, N. PAN–Precursor Relationship and Process Analysis of PAN Variations in the Pearl River Delta Region. Atmosphere 2018, 9, 372.

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