Examining the major contributors of ozone pollution in a rural area of the Yangtze River Delta region during harvest season
Open biomass burning (OBB) emits significant amounts of non-methane hydrocarbons (NMHCs), and the mixing of OBB with urban plumes could exacerbate regional ozone (O<sub>3</sub>) pollution. In the present study, an observational field campaign was performed in a rural area at the northern...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2015-06-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | http://www.atmos-chem-phys.net/15/6101/2015/acp-15-6101-2015.pdf |
| _version_ | 1819034075787165696 |
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| author | X. Pan Y. Kanaya H. Tanimoto S. Inomata Z. Wang S. Kudo I. Uno |
| author_facet | X. Pan Y. Kanaya H. Tanimoto S. Inomata Z. Wang S. Kudo I. Uno |
| author_sort | X. Pan |
| collection | DOAJ |
| description | Open biomass burning (OBB) emits significant amounts of non-methane
hydrocarbons (NMHCs), and the mixing of OBB with urban plumes could
exacerbate regional ozone (O<sub>3</sub>) 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 (O<sub><i>x</i></sub> = O<sub>3</sub> + NO<sub>2</sub>)
at the site was evaluated based on a box model (Regional Atmospheric
Chemical Mechanism, Version 2) constrained by real-time ambient measurements
(e.g., O<sub>3</sub>, volatile organic compounds (VOCs), NO<sub><i>x</i></sub> (NO<sub>2</sub> +
NO), <i>J</i> values). Our results showed that both in situ photochemistry and direct
transport from urban areas in the YRDR were responsible for the high O<sub><i>x</i></sub>
concentration at the site. During an OBB-impact case, net photochemical
production of O<sub><i>x</i></sub> in the daytime was pronounced, with a 6 h averaged
O<sub><i>x</i></sub> production rate of 13 ± 4 ppbv h<sup>−1</sup> (maximum value of 21 ppbv h<sup>−1</sup> at 12:00 CST). Photochemical O<sub><i>x</i></sub>production changed from
VOC-limited in the morning to NO<sub><i>x</i></sub>-limited in the afternoon due to the
rapid photochemical consumption of NO<sub><i>x</i></sub> during the day. A combined
analysis with positive matrix factorization demonstrated that O<sub>3</sub>
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 NO<sub><i>x</i></sub> emissions in the urban
area, as well as local OBB activities, may be effective in eliminating
high-O<sub>3</sub> pollution risk in the rural areas of the YRDR. |
| first_indexed | 2024-12-21T07:27:58Z |
| format | Article |
| id | doaj.art-1233f368b8b54c4eaa80e4593ad7b136 |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-12-21T07:27:58Z |
| publishDate | 2015-06-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-1233f368b8b54c4eaa80e4593ad7b1362022-12-21T19:11:37ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242015-06-0115116101611110.5194/acp-15-6101-2015Examining the major contributors of ozone pollution in a rural area of the Yangtze River Delta region during harvest seasonX. Pan0Y. Kanaya1H. Tanimoto2S. Inomata3Z. Wang4S. Kudo5I. Uno6Japan Agency for Marine-earth Science and Technology, Yokohama, Kanagawa prefecture, JapanJapan Agency for Marine-earth Science and Technology, Yokohama, Kanagawa prefecture, JapanNational Institute for Environmental Studies, Tsukuba, Ibaraki prefecture, JapanNational Institute for Environmental Studies, Tsukuba, Ibaraki prefecture, JapanState Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, ChinaNational Institute for Environmental Studies, Tsukuba, Ibaraki prefecture, JapanJapan Agency for Marine-earth Science and Technology, Yokohama, Kanagawa prefecture, JapanOpen biomass burning (OBB) emits significant amounts of non-methane hydrocarbons (NMHCs), and the mixing of OBB with urban plumes could exacerbate regional ozone (O<sub>3</sub>) 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 (O<sub><i>x</i></sub> = O<sub>3</sub> + NO<sub>2</sub>) at the site was evaluated based on a box model (Regional Atmospheric Chemical Mechanism, Version 2) constrained by real-time ambient measurements (e.g., O<sub>3</sub>, volatile organic compounds (VOCs), NO<sub><i>x</i></sub> (NO<sub>2</sub> + NO), <i>J</i> values). Our results showed that both in situ photochemistry and direct transport from urban areas in the YRDR were responsible for the high O<sub><i>x</i></sub> concentration at the site. During an OBB-impact case, net photochemical production of O<sub><i>x</i></sub> in the daytime was pronounced, with a 6 h averaged O<sub><i>x</i></sub> production rate of 13 ± 4 ppbv h<sup>−1</sup> (maximum value of 21 ppbv h<sup>−1</sup> at 12:00 CST). Photochemical O<sub><i>x</i></sub>production changed from VOC-limited in the morning to NO<sub><i>x</i></sub>-limited in the afternoon due to the rapid photochemical consumption of NO<sub><i>x</i></sub> during the day. A combined analysis with positive matrix factorization demonstrated that O<sub>3</sub> 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 NO<sub><i>x</i></sub> emissions in the urban area, as well as local OBB activities, may be effective in eliminating high-O<sub>3</sub> pollution risk in the rural areas of the YRDR.http://www.atmos-chem-phys.net/15/6101/2015/acp-15-6101-2015.pdf |
| spellingShingle | X. Pan Y. Kanaya H. Tanimoto S. Inomata Z. Wang S. Kudo I. Uno Examining the major contributors of ozone pollution in a rural area of the Yangtze River Delta region during harvest season Atmospheric Chemistry and Physics |
| title | Examining the major contributors of ozone pollution in a rural area of the Yangtze River Delta region during harvest season |
| title_full | Examining the major contributors of ozone pollution in a rural area of the Yangtze River Delta region during harvest season |
| title_fullStr | Examining the major contributors of ozone pollution in a rural area of the Yangtze River Delta region during harvest season |
| title_full_unstemmed | Examining the major contributors of ozone pollution in a rural area of the Yangtze River Delta region during harvest season |
| title_short | Examining the major contributors of ozone pollution in a rural area of the Yangtze River Delta region during harvest season |
| title_sort | examining the major contributors of ozone pollution in a rural area of the yangtze river delta region during harvest season |
| url | http://www.atmos-chem-phys.net/15/6101/2015/acp-15-6101-2015.pdf |
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