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Sökning: L773:1680 7316 > (2020-2024) > Impact of HO2/RO2 r...

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FältnamnIndikatorerMetadata
00003898naa a2200469 4500
001oai:gup.ub.gu.se/338694
003SwePub
008240620s2024 | |||||||||||000 ||eng|
0247 a https://gup.ub.gu.se/publication/3386942 URI
0247 a https://doi.org/10.5194/acp-24-4789-20242 DOI
040 a (SwePub)gu
041 a eng
042 9 SwePub
072 7a ref2 swepub-contenttype
072 7a art2 swepub-publicationtype
1001 a Baker, Yare4 aut
2451 0a Impact of HO2/RO2 ratio on highly oxygenated α-pinene photooxidation products and secondary organic aerosol formation potential
264 1c 2024
520 a Highly oxygenated molecules (HOMs) from the atmospheric oxidation of biogenic volatile organic compounds are important contributors to secondary organic aerosol (SOA). Organic peroxy radicals (RO2) and hydroperoxy radicals (HO2) are key species influencing the HOM product distribution. In laboratory studies, experimental requirements often result in overemphasis on RO2 cross-reactions compared to reactions of RO2 with HO2. We analyzed the photochemical formation of HOMs from alpha-pinene and their potential to contribute to SOA formation under high (approximate to 1/1) and low (approximate to 1/100) conditions. As > 1 is prevalent in the daytime atmosphere, sufficiently high is crucial to mimic atmospheric conditions and to prevent biases by low on the HOM product distribution and thus SOA yield. Experiments were performed under steady-state conditions in the new, continuously stirred tank reactor SAPHIR-STAR at Forschungszentrum J & uuml;lich. The ratio was increased by adding CO while keeping the OH concentration constant. We determined the HOM's SOA formation potential, considering its fraction remaining in the gas phase after seeding with (NH4)(2)SO4 aerosol. An increase in led to a reduction in SOA formation potential, with the main driver being a similar to 60 % reduction in HOM-accretion products. We also observed a shift in HOM-monomer functionalization from carbonyl to hydroperoxide groups. We determined a reduction of the HOM's SOA formation potential by similar to 30 % at approximate to 1/1 compared to approximate to 1/100. Particle-phase observations measured a similar decrease in SOA mass and yield. Our study shows that too low ratios compared to the atmosphere can lead to an overestimation of SOA yields.
650 7a NATURVETENSKAPx Geovetenskap och miljövetenskapx Meteorologi och atmosfärforskning0 (SwePub)105082 hsv//swe
650 7a NATURAL SCIENCESx Earth and Related Environmental Sciencesx Meteorology and Atmospheric Sciences0 (SwePub)105082 hsv//eng
7001 a Kang, Sungah4 aut
7001 a Wang, Hui4 aut
7001 a Wu, Rongrong4 aut
7001 a Xu, Jian4 aut
7001 a Zanders, Annika4 aut
7001 a He, Quanfu4 aut
7001 a Hohaus, Thorsten4 aut
7001 a Ziehm, Till4 aut
7001 a Geretti, Veronica,d 1996u Gothenburg University,Göteborgs universitet,Institutionen för kemi och molekylärbiologi,Department of Chemistry and Molecular Biology4 aut0 (Swepub:gu)xgerve
7001 a Bannan, Thomas J.4 aut
7001 a O'Meara, Simon P.4 aut
7001 a Voliotis, Aristeidis4 aut
7001 a Hallquist, Mattias,d 1969u Gothenburg University,Göteborgs universitet,Institutionen för kemi och molekylärbiologi,Department of Chemistry and Molecular Biology4 aut0 (Swepub:gu)xhamat
7001 a McFiggans, Gordon4 aut
7001 a Zorn, Soeren R.4 aut
7001 a Wahner, Andreas4 aut
7001 a Mentel, Thomas F.4 aut
7102 a Göteborgs universitetb Institutionen för kemi och molekylärbiologi4 org
7730 t ATMOSPHERIC CHEMISTRY AND PHYSICSg 24:8, s. 4789-4807q 24:8<4789-4807x 1680-7316x 1680-7324
8564 8u https://gup.ub.gu.se/publication/338694
8564 8u https://doi.org/10.5194/acp-24-4789-2024

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