Articles | Volume 23, issue 1
https://doi.org/10.5194/acp-23-119-2023
https://doi.org/10.5194/acp-23-119-2023
Research article
 | 
04 Jan 2023
Research article |  | 04 Jan 2023

Formaldehyde and hydroperoxide distribution around the Arabian Peninsula – evaluation of EMAC model results with ship-based measurements

Dirk Dienhart, Bettina Brendel, John N. Crowley, Philipp G. Eger, Hartwig Harder, Monica Martinez, Andrea Pozzer, Roland Rohloff, Jan Schuladen, Sebastian Tauer, David Walter, Jos Lelieveld, and Horst Fischer

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Cited articles

Allen, H. M., Crounse, J. D., Kim, M. J., Teng, A. P., Ray, E. A., McKain, K., Sweeney, C., and Wennberg P. O.: H2O2 and CH3OOH (MHP) in the remote atmosphere: 1. Global distribution and regional influences, J. Geophys. Res.-Atmos., 127, e2021JD035701, https://doi.org/10.1029/2021JD035701, 2022a. 
Allen, H. M., Bates, K. H., Crounse, J. D., Kim, M. J., Teng, A. P., Ray, E. A., and Wennberg, P. O.: H2O2 and CH3OOH (MHP) in the remote atmosphere: 2. Physical and chemical controls, J. Geophys. Res.-Atmos., 127, e2021JD035702, https://doi.org/10.1029/2021JD035702, 2022b. 
Altshuller, A. P., Miller, D. L., and Sleva, S. F.: Determination of Formaldehyde in Gas Mixtures by the Chromotropic Acid Method, Anal. Chem., 33, 621–625, https://doi.org/10.1021/ac60172a043, 1961. 
Berasategui, M., Amedro, D., Vereecken, L., Lelieveld, J., and Crowley, J. N.: Reaction between CH3C(O)OOH (peracetic acid) and OH in the gas phase: a combined experimental and theoretical study of the kinetics and mechanism, Atmos. Chem. Phys., 20, 13541–13555, https://doi.org/10.5194/acp-20-13541-2020, 2020. 
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Short summary
Formaldehyde and hydroperoxide measurements were performed in the marine boundary layer around the Arabian Peninsula and highlight the Suez Canal and Arabian (Persian) Gulf as a hotspot of photochemical air pollution. A comparison with the EMAC model shows that the formaldehyde results match within a factor of 2, while hydrogen peroxide was overestimated by more than a factor of 5, which revealed enhanced HOx (OH+HO2) radicals in the simulation and an underestimation of dry deposition velocites.
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