Investigation of organic hydrotrioxide (roooh) formation from ro2 + oh reactions and their atmospheric impact using a chemical transport model, stochem-cri

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dc.contributor.authorShallcross, Dudley E
dc.contributor.authorKhan, Md Anwar Hossain
dc.contributor.authorHolland, Rayne
dc.date.accessioned2025-08-06T13:37:25Z
dc.date.available2025-08-06T13:37:25Z
dc.date.issued2025
dc.description.abstractIncorporating the reactions of fifty peroxy radicals (RO2) with the hydroxyl radical (OH) into the global chemistry transport model, troposphere, affected the composition of the troposphere by changing the global burdens of NOx (−2.7 Gg, −0.5%), O3 (−2.3 Tg, −0.7%), CO (−3.2 Tg, −0.8%), HOx (+2.1 Gg, +7.7%), H2O2 (+0.5 Tg, +18.3%), RO2 (−8.0 Gg, −18.2%), RONO2 (−19.4 Gg, −4.7%), PAN (−0.1 Tg, −3.4%) HNO3 (−7.4 Gg, −1.3%) and ROOH (−96.9 Gg, −3.8%). The RO2 + OH addition reactions have a significant impact on HO2 mixing ratios in tropical regions with up to a 25% increase, resulting in increasing H2O2 mixing ratios by up to 50% over oceans. Globally, a significant amount of organic hydrotrioxides (ROOOH) (86.1 Tg per year) are produced from these reactions with CH3OOOH (67.5 Tg per year, 78%), isoprene-derived ROOOH (5.5 Tg per year, 6%) and monoterpene-derived ROOOH (4.2 Tg per year, 5%) being the most significant contributors. The tropospheric global burden of CH3OOOH is found to be 0.48 Gg. The highest mixing ratios of ROOOH, of up to 0.35 ppt, are found primarily in the oceans near the tropical land areas. The RO2 + OH reactions have a small, but noticeable, contribution to OH reactivity (∼5%) over tropical oceans. Additionally, these reactions have a significant impact on RO2 reactivity over tropical oceans where losses of the CH3O2 radical, isoprene derived peroxy radical (ISOPO2) and monoterpene derived peroxy radical (MONOTERPO2) by OH can contribute up to 25%, 15% and 50% to the total RO2 loss, respectively. The changes in RO2 reactivity influence the global abundances of organic alcohols (ROH) which are important species due to their crucial impact on air quality. The ROOOH generate secondary organic aerosol (SOA) of up to 0.05 μg m−3 which affects the Earth's radiation budget because of enhancing modelled organic aerosol by up to 5% and 2000% on land surfaces and the remote tropical oceans, respectively.
dc.identifier.citationKhan, M.A.H., Holland, R., Bacak, A., Bannan, T.J., Coe, H., Derwent, R.G., Percival, C.J. and Shallcross, D.E., 2025. Investigation of organic hydrotrioxide (ROOOH) formation from RO 2+ OH reactions and their atmospheric impact using a chemical transport model, STOCHEM-CRI. Environmental Science: Atmospheres, 5(4), pp.442-454.
dc.identifier.urihttps://doi.org/10.1039/d5ea00009b
dc.identifier.urihttps://hdl.handle.net/10566/20657
dc.language.isoen
dc.publisherRoyal Society of Chemistry
dc.subjectOrganic hydrotrioxide
dc.subjectSTOCHEM-CRI
dc.subjectFifty peroxy radicals
dc.subjectHydroxyl radicals (OH)
dc.subjectROOOH
dc.titleInvestigation of organic hydrotrioxide (roooh) formation from ro2 + oh reactions and their atmospheric impact using a chemical transport model, stochem-cri
dc.typeArticle

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