Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2025, V. 22, No. 5, pp. 385-397
Discovery of the possibility of assessing surface ozone formation regimes based on Earth remote sensing data
T.G. Krupnova
1 , O.V. Rakova
1 , G.P. Struchkova
2 , T.A. Kapitonova
2 , S.A. Tikhonova
2 , E.A. Vykhodtseva
3 , V.M. Kochegorov
3 1 South Ural State University, Chelyabinsk, Russia
2 V.P. Larionov Institute of Physical-Technical Problems of the North SB RAS, Yakutsk, Russia
3 Chelyabinsk Center for Hydrometeorology and Environmental Monitoring — Branch of FSBI "Ural UGMS", Chelyabinsk, Russia
Accepted: 16.08.2025
DOI: 10.21046/2070-7401-2025-22-5-385-397
Surface ozone (O3) affects the oxidizing capacity of the atmosphere and leads to the formation of highly toxic photochemical smog. Therefore, it is extremely important to study the patterns of O3 synthesis in the surface air layer. It is produced from complex photochemical reactions involving its precursors: nitrogen oxides (NOx) and volatile organic compounds (VOCs). Surface O3 formation can be limited by NOx or VOCs depending on the regime. Satellite-based data can be very useful for studying the modes of O3 formation, as they provide continuous global observations for two species indicative of O3 precursors, namely nitrogen dioxide (NO2) for NOx and formaldehyde (HCHO) as reliable VOC indicator. In this work, HCHO to NO2 ratios (HCHO/NO2) obtained from the TROPOMI instrument (Sentinel-5P satellite) were used for the first time in Russia. The relationship between the satellite indicator HCHO/NO2 and O3 concentrations recorded by ground-based monitors in Chelyabinsk urban area was shown. Ground-based data showed that high ozone concentrations (270–290 μg/m3) were observed on spring days of 2020 during the COVID-19 quarantine. High O3 events showed a non-linear dependence on the HCHO/NO2 ratio, and the transition from VOC-limited to NOx-limited O3 formation regimes occurred at HCHO/NO2 values from 1 to 1.8. Chelyabinsk in winter was characterized by VOC-limited (NOx-saturated) conditions due to the heating season and high NOx emissions. Spring, summer and fall were characterized by VOC–NOx- and NOx-limited conditions in Chelyabinsk. The study has great importance for elaborating effective plans to reduce surface O3 concentration in the atmosphere of Russian industrial cities.
Keywords: satellite remote sensing, TROPOMI, ground-based data, surface ozone, ozone production regime
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