Peroxyacetyl Nitrate and Ozone Enhancement at Taehwa Research Forest under the Influence of Seoul Metropolitan Area
- Authors
- Gil, Junsu; Lee, Meehye; Han, Jihyun; Kim, Joo-Ae; Kim, Saewung; Guenther, Alex; Kim, Hyunseok; Kim, Soyoung; Lee, Sanguk; Kim, Danbi
- Issue Date
- 9월-2018
- Publisher
- TAIWAN ASSOC AEROSOL RES-TAAR
- Keywords
- Peroxyacetyl nitrate (PAN); Ozone (O-3); Peri-urban forest; Taehwa Research Forest; Seoul Metropolitan Area
- Citation
- AEROSOL AND AIR QUALITY RESEARCH, v.18, no.9, pp.2262 - 2273
- Indexed
- SCIE
SCOPUS
- Journal Title
- AEROSOL AND AIR QUALITY RESEARCH
- Volume
- 18
- Number
- 9
- Start Page
- 2262
- End Page
- 2273
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/73194
- DOI
- 10.4209/aaqr.2017.11.0451
- ISSN
- 1680-8584
- Abstract
- Peroxyacetyl nitrate (PAN) is produced by photochemical oxidation reactions with abundant NOx and volatile organic compounds (VOCs); therefore, it is considered as a photochemical pollution indicator. In this study, PAN, O-3 , and their precursors were measured at three heights (5.4, 23, and 40.5 m) on a 41-m tower in Taehwa Research Forest (TRF) near the Seoul Metropolitan Area (SMA) from August 25 to September 9, 2011. The PAN was determined every 2 minutes using gas chromatography with luminol chemiluminescence detection (GC-LCD). All reactive gases were measured for 15 minutes at each height. The mean and maximum PAN concentrations were 0.3 and 3.1 ppbv, respectively. The mean and maximum O-3 concentrations were 13.1 and 79.8 ppbv, respectively. The average NOx concentration was 6.57 ppbv. At the TRF, PAN and O-3 concentrations were well correlated (r = 0.8) and greatly elevated when the air mass was affected by urban outflows from the SMA, which was clearly demonstrated by an increase in NO2 . These high NO2 concentrations were observed along with a shift in wind direction at 17:00 (KST) and resulted in the maximum observed values of PAN and O-3 in the present study. In addition, the concentration enhancement was more pronounced for PAN and at heights above the canopy. These results highlight PAN as a robust tracer indicating urban impacts at peri-urban forest sites.
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Collections - College of Science > Department of Earth and Environmental Sciences > 1. Journal Articles
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