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- W4220781686 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> 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 2.5Â 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>â<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>Câ<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." @default.
- W4220781686 created "2022-04-03" @default.
- W4220781686 date "2022-03-17" @default.
- W4220781686 modified "2023-09-26" @default.
- W4220781686 title "Comment on acp-2022-141" @default.
- W4220781686 doi "https://doi.org/10.5194/acp-2022-141-rc2" @default.
- W4220781686 hasPublicationYear "2022" @default.
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