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Preprints
https://doi.org/10.5194/egusphere-2024-1947
https://doi.org/10.5194/egusphere-2024-1947
26 Jul 2024
 | 26 Jul 2024

Feasibility of robust estimates of ozone production rates using satellite observations

Amir H. Souri, Gonzalo González Abad, Glenn M. Wolfe, Tijl Verhoelst, Corinne Vigouroux, Gaia Pinardi, Steven Compernolle, Bavo Langerock, Bryan N. Duncan, and Matthew S. Johnson

Abstract. Ozone pollution is secondarily produced through a complex, non-linear chemical process. Our understanding of the spatiotemporal variations in photochemically produced ozone (i.e., PO3) is limited to sparse aircraft campaigns and chemical transport models, which often carry significant biases. Hence, we present a novel satellite-derived PO3 product informed by bias-corrected TROPOMI HCHO, NO2, surface albedo data, and various models. These data are integrated into a parameterization that relies on HCHO, NO2, HCHO/NO2, jNO2, and jO1D. Despite its simplicity, it can reproduce ~90 % of the variance in observationally constrained PO3 with minimal biases in moderately to highly polluted regions. We map PO3 across various regions in July 2019 at a 0.1°×0.1° spatial resolution, revealing accelerated values (>8 ppbv/hr) in numerous cities throughout Asia and the Middle East, resulting from the elevated ozone precursors and enhanced photochemistry. In Europe and the United States, such high levels are only detected over Benelux, Los Angeles, and New York City. PO3 maxima are seen in various seasons, attributed to changes in photolysis rates, non-linear ozone chemistry, and fluctuations in HCHO and NO2. Satellite errors result in moderate errors (40–60 %) of PO3 estimates over cities on a monthly average, while these errors exceed 100 % in clean areas and under low light conditions. Using the current algorithm, we have demonstrated that satellite data can provide valuable information for robust PO3 estimation. This capability expands future research through the application of data to address significant scientific questions about the locally-produced PO3 hotspots, seasonality, and long-term trends.

Competing interests: Bryan N. Duncan is a member of the editorial board of Atmospheric Chemistry and Physics

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
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Journal article(s) based on this preprint

18 Feb 2025
Feasibility of robust estimates of ozone production rates using a synergy of satellite observations, ground-based remote sensing, and models
Amir H. Souri, Gonzalo González Abad, Glenn M. Wolfe, Tijl Verhoelst, Corinne Vigouroux, Gaia Pinardi, Steven Compernolle, Bavo Langerock, Bryan N. Duncan, and Matthew S. Johnson
Atmos. Chem. Phys., 25, 2061–2086, https://doi.org/10.5194/acp-25-2061-2025,https://doi.org/10.5194/acp-25-2061-2025, 2025
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The requested preprint has a corresponding peer-reviewed final revised paper. You are encouraged to refer to the final revised version.

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We establish a simple yet robust relationship between ozone production rates and several...
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