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| Titel |
Examining the major contributors of ozone pollution in a rural area of the Yangtze River Delta region during harvest season |
| VerfasserIn |
X. Pan, Y. Kanaya, H. Tanimoto, S. Inomata, Z. Wang, S. Kudo, I. Uno |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 15, no. 11 ; Nr. 15, no. 11 (2015-06-04), S.6101-6111 |
| Datensatznummer |
250119787
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| Publikation (Nr.) |
 copernicus.org/acp-15-6101-2015.pdf |
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| Zusammenfassung |
| Open biomass burning (OBB) emits significant amounts of non-methane
hydrocarbons (NMHCs), and the mixing of OBB with urban plumes could
exacerbate regional ozone (O3) pollution. In the present study, an
observational field campaign was performed in a rural area at the northern
edge of the Yangtze River Delta region (YRDR) from 15 May to 24 June 2010, during intensive open burning of wheat residues. The net
photochemical production rate of oxidant (Ox = O3 + NO2)
at the site was evaluated based on a box model (Regional Atmospheric
Chemical Mechanism, Version 2) constrained by real-time ambient measurements
(e.g., O3, volatile organic compounds (VOCs), NOx (NO2 +
NO), J values). Our results showed that both in situ photochemistry and direct
transport from urban areas in the YRDR were responsible for the high Ox
concentration at the site. During an OBB-impact case, net photochemical
production of Ox in the daytime was pronounced, with a 6 h averaged
Ox production rate of 13 ± 4 ppbv h−1 (maximum value of 21 ppbv h−1 at 12:00 CST). Photochemical Oxproduction changed from
VOC-limited in the morning to NOx-limited in the afternoon due to the
rapid photochemical consumption of NOx during the day. A combined
analysis with positive matrix factorization demonstrated that O3
pollution in the rural area of the YRDR was largely affected by urban emission,
and OBB-related emissions also contributed to in situ photochemical production,
particularly in the afternoon. Our study suggested that a joint effort in
reducing both NMHCs (e.g., aromatics) and NOx emissions in the urban
area, as well as local OBB activities, may be effective in eliminating
high-O3 pollution risk in the rural areas of the YRDR. |
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