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Ground-based on-line measurements of peroxyacetyl nitrate (PAN) and peroxypropionyl nitrate (PPN) in the Pearl River Delta, China

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Aiming at understanding the regional O3 problem and the impacts of city to rural areas, ambient peroxyacetyl nitrate (PAN) and peroxypropionyl nitrate (PPN) were measured by an on-line instrument at a back garden site (BGS), and a receptor site for urban plume from Guangzhou city. The highest mixing ratios for PAN and PPN were 3.9 and 0.7 ppbv, respectively. PAN and PPN had a similar diurnal pattern as that of O3. As revealed by the slope of the linear regression line between PPN and PAN, anthropogenic volatile organic compounds (AVOCs) dominated photochemical O3 production most of the time. From the correlation between PAN and O3, the regional background level of O3 was derived to be 28 ± 15 ppbv. Two night-time plumes containing elevated PAN and O3 were observed, and the backward-trajectory analysis supported the transport of urban plume from Guangzhou city. Based on the temporal variation of PPN/PAN, two day-time episodes were also selected to discuss the influence from Guangzhou.
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Keywords: PAN; PPN; PRD; regional ozone pollution; transportation

Document Type: Research Article

Affiliations: 1: State Joint Key Laboratory of Environmental Simulation and Pollution Control, College of Environmental Science and Engineering, Peking University, Beijing 100871, China 2: NOAA/ESRL Chemical Sciences Division, and Cooperative Institute for Research in the Environmental Sciences, University of Colorado, Boulder 80305, CO, USA

Publication date: January 1, 2010

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