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Atmospheric Hydrogen Peroxide (H 2 O 2 ) at the Foot and Summit of Mt. Tai: Variations, Sources and Sinks, and Implications for Ozone Formation Chemistry

Abstract : Hydrogen peroxide (H 2 O 2) acts as a terminal sink for atmospheric HO x radicals (OH and HO 2), playing a key role in tropospheric O 3 formation. However, there are few field measurements of atmospheric H 2 O 2 to assess its role in O 3 formation, especially for the seriously polluted region of the North China Plain. In this study, H 2 O 2 concentrations were measured at the foot of Mt. Tai from May to July 2018 and the summit of Mt. Tai from May to June 2019, with average values of 0.93 ± 1.01 and 2.05 ± 1.20 ppb, respectively. H 2 O 2 exhibited a pronounced diurnal variation with a noon-peak at the foot of Mt. Tai, which could be well reproduced by a gas-phase box model with H 2 O 2 dry deposition velocity of 3 cm s −1 included, indicating H 2 O 2 was mainly photochemically produced. Modeling analysis showed H 2 O 2 production at the foot was most sensitive to alkenes and aromatics, while the source and sink for H 2 O 2 were dominated by HO 2 recombination and dry deposition, respectively. Compared with the summer-measurement in 2007, the remarkable elevation of H 2 O 2 at the summit might be ascribed to volatile organic compounds (VOCs) increase and SO 2 decline. Both H 2 O 2-O 3 correlation and H 2 O 2 / NO z ratio suggested O 3 formation at the foot of Mt. Tai was mainly VOC-sensitive in the early morning and shifted to NO x-sensitive thereafter. Therefore, reduction of VOCs emission especially for the reactive species of alkenes and aromatics in the morning as well as NO x emission around noontime will be effective for mitigating the serious O 3 (as well as H 2 O 2) pollution in Tai'an city. YE ET AL.
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Submitted on : Thursday, August 12, 2021 - 8:13:45 AM
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Can Ye, Chaoyang Xue, Chenglong Zhang, Zhuobiao Ma, Pengfei Liu, et al.. Atmospheric Hydrogen Peroxide (H 2 O 2 ) at the Foot and Summit of Mt. Tai: Variations, Sources and Sinks, and Implications for Ozone Formation Chemistry. Journal of Geophysical Research: Atmospheres, American Geophysical Union, 2021, 126 (15), ⟨10.1029/2020JD033975⟩. ⟨insu-03319270⟩

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