Modeling of Methyl Hydroperoxide Observations in Urban and Remote Air Over South Korea: Methylperoxy Radical Chemistry and Inference of Atmospheric Methanediol

Yang, L. H.; Jacob, D. J.; Bates, K. H.; Lin, H.; Allen, H. M.; Müller, J.‐F.; Brown, S. S.; Dang, R.; Colombi, N. K.; Zhai, S.; Yantosca, R. M.; Brewer, J. F.; Ng, N. L.; Crounse, J. D.; Wennberg, P. O.; Li, K.; Liao, H.

doi:10.1029/2025gl118267

i

Modeling of Methyl Hydroperoxide Observations in Urban and Remote Air Over South Korea: Methylperoxy Radical Chemistry and Inference of Atmospheric Methanediol

2025
By Yang, L. H. ; Jacob, D. J. ; Bates, K. H. ; Lin, H. ; Allen, H. M. ; Müller, J.‐F. ; Brown, S. S. ; Dang, R. ; Colombi, N. K. ; Zhai, S. ; Yantosca, R. M. ; Brewer, J. F. ; Ng, N. L. ; Crounse, J. D. ; Wennberg, P. O. ; Li, K. ; Liao, H.
Source: Geophysical Research Letters, 52(22)

Details

Journal Title:

Geophysical Research Letters
Personal Author:

Yang, L. H. ; Jacob, D. J. ; Bates, K. H. ; Lin, H. ; Allen, H. M. ; Müller, J.‐F. ; Brown, S. S. ; Dang, R. ; Colombi, N. K. ; Zhai, S. ; Yantosca, R. M. ; Brewer, J. F. ; Ng, N. L. ; Crounse, J. D. ; Wennberg, P. O. ; Li, K. ; Liao, H.
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; ESRL (Earth System Research Laboratory)
Description:

Methyl hydroperoxide (MHP) is produced by the CH 3 O 2 + HO 2 reaction in the oxidation cascade of volatile organic compounds (VOCs). During KORUS‐AQ (May-June 2016), aircraft observations over Seoul using chemical ionization mass spectrometry reported MHP concentrations exceeding 1 ppb in the planetary boundary layer, four times higher than simulated by the GEOS‐Chem atmospheric chemistry model. We show that this discrepancy can be explained in part by the instrument's positive interference from methanediol (MD) under high‐humidity conditions, where MD is produced in clouds by formaldehyde hydration. Including MD chemistry in GEOS‐Chem increases the global formic acid source by 11% but has otherwise minimal impact on the model chemistry. Observed MHP concentrations in the dry free troposphere are much less sensitive to MD interference and vary with the branching ratio of the CH 3 O 2 reaction with HO 2 versus NO, supporting current understanding of low‐NO and high‐NO chemical regimes for VOC oxidation.
Source:

Geophysical Research Letters, 52(22)
DOI:

https://doi.org/10.1029/2025gl118267
ISSN:

0094-8276 ; 1944-8007
Format:

pdf
Publisher:

American Geophysical Union (AGU)
Document Type:

Journal Article
License:

https://creativecommons.org/licenses/by-nc-nd/4.0/
Rights Information:

CC BY-NC-ND
Compliance:

Library
Download URL:

https://repository.library.noaa.gov/view/noaa/75512/noaa_75512_DS1.pdf
File Type:

[PDF - 1.55 MB]
Collection(s):

Office of Oceanic and Atmospheric Research (OAR)
Main Document Checksum:

urn:sha-512:086963e56df160d890bc3f1d56928b74807d69e1e9e16c11ef4dacdd79686f0747a0ae1da9ea3aa492f75ff556d17ac264d93ec79774461aab912cacae34af2b

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