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H₂O₂ and CH₃OOH (MHP) in the Remote Atmosphere: 2. Physical and Chemical Controls

Allen, Hannah M. and Bates, Kelvin H. and Crounse, John D. and Kim, Michelle J. and Teng, Alexander P. and Ray, Eric A. and Wennberg, Paul O. (2022) H₂O₂ and CH₃OOH (MHP) in the Remote Atmosphere: 2. Physical and Chemical Controls. Journal of Geophysical Research. Atmospheres, 127 (6). Art. No. e2021JD035702. ISSN 2169-897X. doi:10.1029/2021jd035702.

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Hydrogen peroxide (H₂O₂) and methyl hydroperoxide (MHP, CH₃OOH) serve as HOₓ (OH and HO₂ radicals) reservoirs and therefore as useful tracers of HOₓ chemistry. Both hydroperoxides were measured during the 2016–2018 Atmospheric Tomography Mission as part of a global survey of the remote troposphere over the Pacific and Atlantic Ocean basins conducted using the NASA DC-8 aircraft. To assess the relative contributions of chemical and physical processes to the global hydroperoxide budget and their impact on atmospheric oxidation potential, we compare the observations with two models, a diurnal steady-state photochemical box model and the global chemical transport model Goddard Earth Observing System (GEOS)-Chem. We find that the models systematically under-predict H₂O₂ by 5%–20% and over-predict MHP by 40%–50% relative to measurements. In the marine boundary layer, over-predictions of H₂O₂ in a photochemical box model are used to estimate H₂O₂ boundary-layer mean deposition velocities of 1.0–1.32 cm s⁻¹, depending on season; this process contributes to up to 5%–10% of HOₓ loss in this region. In the upper troposphere and lower stratosphere, MHP is under-predicted and H₂O₂ is over-predicted by a factor of 2–3 on average. The differences between the observations and predictions are associated with recent convection: MHP is under-estimated and H₂O₂ is over-estimated in air parcels that have experienced recent convective influence.

Item Type:Article
Related URLs:
URLURL TypeDescription data
Allen, Hannah M.0000-0002-4218-5133
Bates, Kelvin H.0000-0001-7544-9580
Crounse, John D.0000-0001-5443-729X
Kim, Michelle J.0000-0002-4922-4334
Teng, Alexander P.0000-0002-6434-0501
Ray, Eric A.0000-0001-8727-9849
Wennberg, Paul O.0000-0002-6126-3854
Alternate Title:H2O2 and CH3OOH (MHP) in the Remote Atmosphere: 2. Physical and Chemical Controls
Additional Information:© 2022 American Geophysical Union. Issue Online: 18 March 2022; Version of Record online: 18 March 2022; Accepted manuscript online: 01 March 2022; Manuscript accepted: 27 February 2022; Manuscript revised: 11 February 2022; Manuscript received: 13 August 2021. Funding for this work was provided by NASA Grant No. NNX15AG61A. Additional support for H. M. Allen was provided by the National Science Foundation Graduate Research Fellowship under Grant No. DGE-1144469 and additional support for M. J. Kim was provided by the National Science Foundation Grant No. 1524860. The authors would like to thank the organizers of the ATom Mission, particularly S. C. Wofsy and T. B. Ryerson, for providing the opportunity to gather these data. We would also like to thank E. Czech, D. Jordan, and the people at ESPO, as well as the pilots and crew of the DC-8 for the infrastructural support that made these measurements possible. Data Availability Statement: The field data collected during the ATom deployments and used in this paper are available at
Funding AgencyGrant Number
NSF Graduate Research FellowshipDGE-1144469
Subject Keywords:Hydroperoxides; ATom Mission; Remote Atmosphere; Deposition; Convection; Photochemistry
Issue or Number:6
Record Number:CaltechAUTHORS:20220315-625973000
Persistent URL:
Official Citation:Allen, H. M., Bates, K. H., Crounse, J. D., Kim, M. J., Teng, A. P., Ray, E. A., & Wennberg, P. O. (2022). H2O2 and CH3OOH (MHP) in the remote atmosphere: 2. Physical and chemical controls. Journal of Geophysical Research: Atmospheres, 127, e2021JD035702.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:113914
Deposited By: George Porter
Deposited On:16 Mar 2022 17:38
Last Modified:28 Mar 2022 23:23

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