18 Jan 2021

18 Jan 2021

Review status: this preprint is currently under review for the journal ACP.

Kinetics and impacting factors of HO2 uptake onto submicron atmospheric aerosols during a 2019 air quality study (AQUAS) in Yokohama, Japan

Jun Zhou1,2,3, Kei Sato4, Yu Bai5, Yukiko Fukusaki6, Yuka Kousa6, Sathiyamurthi Ramasamy4, Akinori Takami4, Ayako Yoshino4, Tomoki Nakayama7, Yasuhiro Sadanaga8, Yoshihiro Nakashima9, Jiaru Li3, Kentaro Murano3, Nanase Kohno3, Yosuke Sakamoto3,4,5, and Yoshizumi Kajii3,4,5 Jun Zhou et al.
  • 1Institute for Environmental and Climate Research, Jinan University, 511443 Guangzhou, China
  • 2Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Guangzhou 511443, China
  • 3Graduate School of Global Environmental Studies, Kyoto University, Kyoto, 606-8501, Japan
  • 4Center for Regional Environmental Research, National Institute for Environmental Studies, Tsukuba, Ibaraki 305-8506, Japan
  • 5Graduate School of Human and Environmental Studies, Kyoto University, Kyoto 606-8501, Japan
  • 6Yokohama Environmental Science Research Institute, Yokohama Kanagawa 221‒0024, Japan
  • 7Faculty of Environmental Science and Graduate School of Fisheries and Environmental Sciences, Nagasaki University, Nagasaki 852-8521, Japan
  • 8Graduate School of Engineering, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
  • 9Graduate School of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-8538, Japan

Abstract. HO2 uptake kinetics onto ambient aerosols play pivotal roles in tropospheric chemistry but are not fully understood. Field measurements of aerosol chemical and physical properties should be linked to molecular level kinetics; however, given that the HO2 reactivity of ambient aerosols is low, traditional analytical techniques are unable to achieve this goal. We developed an online approach to precisely investigate (i) the HO2 reactivity of ambient gases and aerosols and (ii) HO2 uptake coefficients onto ambient aerosols (ɣ) during 2019 air quality study (AQUAS) in Yokohama, Japan. We identified the effects of individual chemical components of ambient aerosols on ɣ. The results verified in laboratory studies on individual chemical components: transition metals play a key role in HO2 uptake processes and chemical components indirectly influence such processes (i.e., through altering aerosol surface properties or providing active sites), with smaller particles tending to yield higher ɣ values than larger particles owing to the limitation of gas phase diffusion is smaller with micrometer particles and the distribution of depleting species such as transition metal ions is mostly distributed in accumulation mode of aerosol. The modeling of ɣ utilized transition metal chemistry derived by previous studies, further confirming our conclusion. However, owing to the high NO concentrations in Yokohama, peroxy radical loss onto submicron aerosols has a negligible impact on O3 production rate and sensitivity regime.

Jun Zhou et al.

Status: open (until 15 Mar 2021)

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  • RC1: 'Comment on acp-2020-1214', Anonymous Referee #2, 07 Feb 2021 reply

Jun Zhou et al.


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Short summary
HO2 radicals play key roles in tropospheric chemistry, their levels in ambient air were not yet fully explained by sophisticated models. Here we measured HO2 uptake kinetics onto ambient aerosols in real-time using a self-built online method, and investigated the impacting factors on such processes by coupling with other instrumentations. The role of HO2 uptake process in O3 formation were also discussed. Results give useful information for coordinated control of aerosol and ozone pollutants.