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Measurements of Peroxyacetyl Nitrate at a Background Site in the Pearl River Delta Region: Production Efficiency and Regional Transport

Category: Aerosol and Atmospheric Chemistry

Volume: 15 | Issue: 3 | Pages: 833-841
DOI: 10.4209/aaqr.2014.11.0275
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Zheng Xu1,2, Likun Xue 1,2, Tao Wang1,2, Tian Xia2, Yuan Gao2, Peter K.K. Louie3, Connie W.Y. Luk3

  • 1 Environment Research Institute, Shandong University, Ji’nan, Shandong, China
  • 2 Department of Civil and Environmental Engineering, Hong Kong Polytechnic University, Hong Kong, China
  • 3 Environmental Protection Department, the Government of Hong Kong Special Administrative Region, Hong Kong, China

Highlights

PAN production accounts for ~30% of NO2 oxidation in the PRD plumes.
Production efficiency of PAN with O3 was lower in the PRD than in Beijing and Lanzhou.
Regional transport affects significantly the PAN pollution and NOz budget at Hok Tsui.


Abstract

Peroxyacetyl nitrate (PAN) is a trace constituent of the atmosphere but plays important roles in air pollution and atmospheric chemistry. To understand the chemical and transport processes of PAN in the Pearl River Delta (PRD) region, measurements of PAN, its precursors and related parameters were made at a regional background site in late summer and late autumn of 2011. Despite the fairly low ambient levels of PAN in general, several photochemical episodes with peak concentrations of PAN and ozone (O3) as high as 4.86 and 189 ppbv were observed when the region was under influence of a tropical cyclone. PAN showed a seasonal variation with higher levels in autumn than in summer. PAN production efficiency, defined as the amount of PAN formed per unit amount of nitrogen oxides (NOx) oxidized, was examined for the polluted PRD plumes, which indicated that PAN production accounted for on average approximately one third of the NOz formation. The photochemical production efficiency of PAN was much lower with respect to that of O3, suggesting that ~2.9 ppbv of PAN could be produced per formation of 100 ppbv of O3 in the PRD plumes. Varying air masses including maritime air, regional air masses from the PRD, and continental outflow from eastern China were identified, which showed different chemical signatures in terms of both pollution levels and NOz budget. The highest abundances of PAN were measured in the PRD air masses, compared to the lowest concentrations in the marine air. Overall, the present study provides some new insights into the photochemical production and regional transport of PAN in the PRD region, where such investigations were very scarce before.

Keywords

Peroxyacetyl nitrate PAN production efficiency Regional transport Pearl River Delta


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