Evolution of source attributed organic aerosols and gases in a megacity of central China
<p>The secondary production of oxygenated organic aerosol (OOA) impacts air quality, climate, and human health. The importance of various sources in contributing to the OOA loading and associated different ageing mechanisms remains to be elucidated. Here we present a concurrent observation and...
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| Language: | English |
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Copernicus Publications
2022-05-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://acp.copernicus.org/articles/22/6937/2022/acp-22-6937-2022.pdf |
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| author | S. Li D. Liu S. Kong Y. Wu K. Hu H. Zheng Y. Cheng S. Zheng X. Jiang S. Ding D. Hu Q. Liu P. Tian D. Zhao J. Sheng |
| author_facet | S. Li D. Liu S. Kong Y. Wu K. Hu H. Zheng Y. Cheng S. Zheng X. Jiang S. Ding D. Hu Q. Liu P. Tian D. Zhao J. Sheng |
| author_sort | S. Li |
| collection | DOAJ |
| description | <p>The secondary production of oxygenated organic aerosol (OOA) impacts air quality, climate, and human health. The importance of various sources in contributing to the OOA loading and associated different ageing mechanisms remains to be elucidated. Here we present a concurrent observation and factorization analysis on the mass spectra of
organic aerosol (OA) by a high-resolution aerosol mass spectrometer and volatile organic compounds (VOCs) by a proton transfer reaction mass spectrometer in Wuhan, a megacity in central China, during autumn. The full mass spectra of organics with two principle anthropogenic sources were identified as the traffic and cooking sources, for their primary emission profiles in aerosol and gas phases, the evolutions, and their respective roles in producing OOA and secondary VOCs. Primary emissions in gas and aerosol phases both contributed to the production of OOA. The photooxidation of traffic sources from the morning rush hour caused a 2.5 fold increase in OOA
mass in a higher oxidation state (oxygen-to-carbon ratio as <span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M1" display="inline" overflow="scroll" dspmath="mathml"><mrow class="chem"><mi mathvariant="normal">O</mi><mo>/</mo><mi mathvariant="normal">C</mi></mrow></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="25pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="528ec602ad41012dbd8700839f42941d"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="acp-22-6937-2022-ie00001.svg" width="25pt" height="14pt" src="acp-22-6937-2022-ie00001.png"/></svg:svg></span></span> <span class="inline-formula">=0.72</span>), co-producing gas phase carboxylic acids, while, at night, cooking aerosols and VOCs (particularly acrolein and hexanal) importantly caused the nocturnal
formation of oxygenated intermediate VOCs, increasing OOA mass by a factor of 1.7 (O<span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M3" display="inline" overflow="scroll" dspmath="mathml"><mo>/</mo></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="8pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="e653eaf840568ee76bb20ba3bf368ae0"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="acp-22-6937-2022-ie00002.svg" width="8pt" height="14pt" src="acp-22-6937-2022-ie00002.png"/></svg:svg></span></span>C <span class="inline-formula">=0.42</span>). The daytime and nighttime formation of secondary aerosols, as contributed by different sources, was found to be modulated by solar radiation and air moisture, respectively. The environmental policy should, therefore, consider the primary emissions and their respective ageing mechanisms influenced by meteorological conditions.</p> |
| first_indexed | 2024-12-12T06:09:07Z |
| format | Article |
| id | doaj.art-459fbf041eb64f2296c41808ecdaee56 |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-12-12T06:09:07Z |
| publishDate | 2022-05-01 |
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| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-459fbf041eb64f2296c41808ecdaee562022-12-22T00:35:13ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242022-05-01226937695110.5194/acp-22-6937-2022Evolution of source attributed organic aerosols and gases in a megacity of central ChinaS. Li0D. Liu1S. Kong2Y. Wu3K. Hu4H. Zheng5Y. Cheng6S. Zheng7X. Jiang8S. Ding9D. Hu10Q. Liu11P. Tian12D. Zhao13J. Sheng14Department of Atmospheric Sciences, School of Earth Sciences, Zhejiang University, Hangzhou 310027, ChinaDepartment of Atmospheric Sciences, School of Earth Sciences, Zhejiang University, Hangzhou 310027, ChinaDepartment of Atmospheric Sciences, School of Environmental Studies, China University of Geosciences, Wuhan 430074, ChinaDepartment of Atmospheric Sciences, School of Earth Sciences, Zhejiang University, Hangzhou 310027, ChinaDepartment of Atmospheric Sciences, School of Earth Sciences, Zhejiang University, Hangzhou 310027, ChinaDepartment of Atmospheric Sciences, School of Environmental Studies, China University of Geosciences, Wuhan 430074, ChinaDepartment of Atmospheric Sciences, School of Environmental Studies, China University of Geosciences, Wuhan 430074, ChinaDepartment of Atmospheric Sciences, School of Environmental Studies, China University of Geosciences, Wuhan 430074, ChinaDepartment of Atmospheric Sciences, School of Earth Sciences, Zhejiang University, Hangzhou 310027, ChinaDepartment of Atmospheric Sciences, School of Earth Sciences, Zhejiang University, Hangzhou 310027, ChinaCentre for Atmospheric Sciences, School of Earth and Environmental Sciences, University of Manchester, Manchester M13 9PL, UKState Key Laboratory of Severe Weather and Key Laboratory of Atmospheric Chemistry of CMA, Chinese Academy of Meteorological Sciences, Beijing 100081, ChinaBeijing Key Laboratory of Cloud, Precipitation and Atmospheric Water Resources, Beijing Meteorological Service, Beijing 100089, ChinaBeijing Key Laboratory of Cloud, Precipitation and Atmospheric Water Resources, Beijing Meteorological Service, Beijing 100089, ChinaBeijing Key Laboratory of Cloud, Precipitation and Atmospheric Water Resources, Beijing Meteorological Service, Beijing 100089, China<p>The secondary production of oxygenated organic aerosol (OOA) impacts air quality, climate, and human health. The importance of various sources in contributing to the OOA loading and associated different ageing mechanisms remains to be elucidated. Here we present a concurrent observation and factorization analysis on the mass spectra of organic aerosol (OA) by a high-resolution aerosol mass spectrometer and volatile organic compounds (VOCs) by a proton transfer reaction mass spectrometer in Wuhan, a megacity in central China, during autumn. The full mass spectra of organics with two principle anthropogenic sources were identified as the traffic and cooking sources, for their primary emission profiles in aerosol and gas phases, the evolutions, and their respective roles in producing OOA and secondary VOCs. Primary emissions in gas and aerosol phases both contributed to the production of OOA. The photooxidation of traffic sources from the morning rush hour caused a 2.5 fold increase in OOA mass in a higher oxidation state (oxygen-to-carbon ratio as <span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M1" display="inline" overflow="scroll" dspmath="mathml"><mrow class="chem"><mi mathvariant="normal">O</mi><mo>/</mo><mi mathvariant="normal">C</mi></mrow></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="25pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="528ec602ad41012dbd8700839f42941d"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="acp-22-6937-2022-ie00001.svg" width="25pt" height="14pt" src="acp-22-6937-2022-ie00001.png"/></svg:svg></span></span> <span class="inline-formula">=0.72</span>), co-producing gas phase carboxylic acids, while, at night, cooking aerosols and VOCs (particularly acrolein and hexanal) importantly caused the nocturnal formation of oxygenated intermediate VOCs, increasing OOA mass by a factor of 1.7 (O<span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M3" display="inline" overflow="scroll" dspmath="mathml"><mo>/</mo></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="8pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="e653eaf840568ee76bb20ba3bf368ae0"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="acp-22-6937-2022-ie00002.svg" width="8pt" height="14pt" src="acp-22-6937-2022-ie00002.png"/></svg:svg></span></span>C <span class="inline-formula">=0.42</span>). The daytime and nighttime formation of secondary aerosols, as contributed by different sources, was found to be modulated by solar radiation and air moisture, respectively. The environmental policy should, therefore, consider the primary emissions and their respective ageing mechanisms influenced by meteorological conditions.</p>https://acp.copernicus.org/articles/22/6937/2022/acp-22-6937-2022.pdf |
| spellingShingle | S. Li D. Liu S. Kong Y. Wu K. Hu H. Zheng Y. Cheng S. Zheng X. Jiang S. Ding D. Hu Q. Liu P. Tian D. Zhao J. Sheng Evolution of source attributed organic aerosols and gases in a megacity of central China Atmospheric Chemistry and Physics |
| title | Evolution of source attributed organic aerosols and gases in a megacity of central China |
| title_full | Evolution of source attributed organic aerosols and gases in a megacity of central China |
| title_fullStr | Evolution of source attributed organic aerosols and gases in a megacity of central China |
| title_full_unstemmed | Evolution of source attributed organic aerosols and gases in a megacity of central China |
| title_short | Evolution of source attributed organic aerosols and gases in a megacity of central China |
| title_sort | evolution of source attributed organic aerosols and gases in a megacity of central china |
| url | https://acp.copernicus.org/articles/22/6937/2022/acp-22-6937-2022.pdf |
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