Insights on organic aerosol aging and the influence of coal combustion at a regional receptor site of central eastern China
In order to understand the aging and processing of organic aerosols (OA), an intensive field campaign (<b>C</b>ampaign of <b>A</b>ir <b>P</b>ollution at <b>T</b>ypical <b>C</b>oastal <b>A</b>reas <b>IN</b> Eastern Ch...
| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2013-10-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | http://www.atmos-chem-phys.net/13/10095/2013/acp-13-10095-2013.pdf |
| _version_ | 1811308676456120320 |
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| author | W. W. Hu M. Hu B. Yuan J. L. Jimenez Q. Tang J. F. Peng W. Hu M. Shao M. Wang L. M. Zeng Y. S. Wu Z. H. Gong X. F. Huang L. Y. He |
| author_facet | W. W. Hu M. Hu B. Yuan J. L. Jimenez Q. Tang J. F. Peng W. Hu M. Shao M. Wang L. M. Zeng Y. S. Wu Z. H. Gong X. F. Huang L. Y. He |
| author_sort | W. W. Hu |
| collection | DOAJ |
| description | In order to understand the aging and processing of organic aerosols (OA), an intensive field campaign (<b>C</b>ampaign of <b>A</b>ir <b>P</b>ollution at <b>T</b>ypical <b>C</b>oastal <b>A</b>reas <b>IN</b> Eastern China, CAPTAIN) was conducted March–April at a receptor site (a Changdao island) in central eastern China. Multiple fast aerosol and gas measurement instruments were used during the campaign, including a high resolution time-of-flight aerosol mass spectrometer (HR-ToF-AMS) that was applied to measure mass concentrations and non-refractory chemical components of submicron particles (PM<sub>1</sub><sup>nr</sup>). The average mass concentration of PM<sub>1</sub>(PM<sub>1</sub><sup>nr</sup>+black carbon) was 47 ± 36 μg m<sup>−3</sup> during the campaign and showed distinct variation, depending on back trajectories and their overlap with source regions. Organic aerosol (OA) is the largest component of PM<sub>1</sub> (30%), followed by nitrate (28%), sulfate (19%), ammonium (15%), black carbon (6%), and chloride (3%). Four OA components were resolved by positive matrix factorization (PMF) of the high-resolution spectra, including low-volatility oxygenated organic aerosol (LV-OOA), semi-volatile oxygenated OA (SV-OOA), hydrocarbon-like OA (HOA) and a coal combustion OA (CCOA). The mass spectrum of CCOA had high abundance of fragments from polycyclic aromatic hydrocarbons (PAHs) (<i>m/z</i> 128, 152, 178, etc.). The average atomic ratio of oxygen to carbon in OA (O / C) at Changdao was 0.59, which is comparable to other field studies reported at locations downwind of large pollution sources, indicating the oxidized nature of most OA during the campaign. The evolution of OA elemental composition in the van Krevelen diagram (H / C vs. O / C) showed a slope of −0.63; however, the OA influenced by coal combustion exhibits a completely different evolution that appears dominated by physical mixing. The aging of organic aerosols vs. photochemical age was investigated. It was shown that OA / ΔCO, as well as LV-OOA / ΔCO and SV-OOA / ΔCO, positively correlated with photochemical age. LV-OOA accounted for 73% of the OA secondary formation (SOA) in the oldest plumes (photochemical age of 25 h). The <i>k</i><sub>OH</sub> at Changdao, by assuming SOA formation and aging as a first-order process proportional to OH, was calculated to be 5.2 × 10<sup>−12</sup> cm<sup>3</sup> molec.<sup>−1</sup> s<sup>−1</sup>, which is similar to those determined in recent studies of polluted air in other continents. |
| first_indexed | 2024-04-13T09:27:30Z |
| format | Article |
| id | doaj.art-33420c8b4cfe43428b73cb9b3aed6d60 |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-04-13T09:27:30Z |
| publishDate | 2013-10-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-33420c8b4cfe43428b73cb9b3aed6d602022-12-22T02:52:22ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242013-10-011319100951011210.5194/acp-13-10095-2013Insights on organic aerosol aging and the influence of coal combustion at a regional receptor site of central eastern ChinaW. W. HuM. HuB. YuanJ. L. JimenezQ. TangJ. F. PengW. HuM. ShaoM. WangL. M. ZengY. S. WuZ. H. GongX. F. HuangL. Y. HeIn order to understand the aging and processing of organic aerosols (OA), an intensive field campaign (<b>C</b>ampaign of <b>A</b>ir <b>P</b>ollution at <b>T</b>ypical <b>C</b>oastal <b>A</b>reas <b>IN</b> Eastern China, CAPTAIN) was conducted March–April at a receptor site (a Changdao island) in central eastern China. Multiple fast aerosol and gas measurement instruments were used during the campaign, including a high resolution time-of-flight aerosol mass spectrometer (HR-ToF-AMS) that was applied to measure mass concentrations and non-refractory chemical components of submicron particles (PM<sub>1</sub><sup>nr</sup>). The average mass concentration of PM<sub>1</sub>(PM<sub>1</sub><sup>nr</sup>+black carbon) was 47 ± 36 μg m<sup>−3</sup> during the campaign and showed distinct variation, depending on back trajectories and their overlap with source regions. Organic aerosol (OA) is the largest component of PM<sub>1</sub> (30%), followed by nitrate (28%), sulfate (19%), ammonium (15%), black carbon (6%), and chloride (3%). Four OA components were resolved by positive matrix factorization (PMF) of the high-resolution spectra, including low-volatility oxygenated organic aerosol (LV-OOA), semi-volatile oxygenated OA (SV-OOA), hydrocarbon-like OA (HOA) and a coal combustion OA (CCOA). The mass spectrum of CCOA had high abundance of fragments from polycyclic aromatic hydrocarbons (PAHs) (<i>m/z</i> 128, 152, 178, etc.). The average atomic ratio of oxygen to carbon in OA (O / C) at Changdao was 0.59, which is comparable to other field studies reported at locations downwind of large pollution sources, indicating the oxidized nature of most OA during the campaign. The evolution of OA elemental composition in the van Krevelen diagram (H / C vs. O / C) showed a slope of −0.63; however, the OA influenced by coal combustion exhibits a completely different evolution that appears dominated by physical mixing. The aging of organic aerosols vs. photochemical age was investigated. It was shown that OA / ΔCO, as well as LV-OOA / ΔCO and SV-OOA / ΔCO, positively correlated with photochemical age. LV-OOA accounted for 73% of the OA secondary formation (SOA) in the oldest plumes (photochemical age of 25 h). The <i>k</i><sub>OH</sub> at Changdao, by assuming SOA formation and aging as a first-order process proportional to OH, was calculated to be 5.2 × 10<sup>−12</sup> cm<sup>3</sup> molec.<sup>−1</sup> s<sup>−1</sup>, which is similar to those determined in recent studies of polluted air in other continents.http://www.atmos-chem-phys.net/13/10095/2013/acp-13-10095-2013.pdf |
| spellingShingle | W. W. Hu M. Hu B. Yuan J. L. Jimenez Q. Tang J. F. Peng W. Hu M. Shao M. Wang L. M. Zeng Y. S. Wu Z. H. Gong X. F. Huang L. Y. He Insights on organic aerosol aging and the influence of coal combustion at a regional receptor site of central eastern China Atmospheric Chemistry and Physics |
| title | Insights on organic aerosol aging and the influence of coal combustion at a regional receptor site of central eastern China |
| title_full | Insights on organic aerosol aging and the influence of coal combustion at a regional receptor site of central eastern China |
| title_fullStr | Insights on organic aerosol aging and the influence of coal combustion at a regional receptor site of central eastern China |
| title_full_unstemmed | Insights on organic aerosol aging and the influence of coal combustion at a regional receptor site of central eastern China |
| title_short | Insights on organic aerosol aging and the influence of coal combustion at a regional receptor site of central eastern China |
| title_sort | insights on organic aerosol aging and the influence of coal combustion at a regional receptor site of central eastern china |
| url | http://www.atmos-chem-phys.net/13/10095/2013/acp-13-10095-2013.pdf |
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