Articles | Volume 24, issue 3
https://doi.org/10.5194/acp-24-1979-2024
https://doi.org/10.5194/acp-24-1979-2024
Research article
 | 
14 Feb 2024
Research article |  | 14 Feb 2024

Influences of downward transport and photochemistry on surface ozone over East Antarctica during austral summer: in situ observations and model simulations

Imran A. Girach, Narendra Ojha, Prabha R. Nair, Kandula V. Subrahmanyam, Neelakantan Koushik, Mohammed M. Nazeer, Nadimpally Kiran Kumar, Surendran Nair Suresh Babu, Jos Lelieveld, and Andrea Pozzer

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Cited articles

Ajayakumar, R. S., Nair, P. R., Girach, I. A., Sunilkumar, S. V., Muhsin, M., and Chandran, P. S.: Dynamical nature of tropospheric ozone over a tropical location in Peninsular India: Role of transport and water vapour. Atmos. Environ.. 218, 117018, https://doi.org/10.1016/j.atmosenv.2019.117018, 2019. 
Ali, K., Trivedi, D. K., and Sahu, S. K.: Surface ozone characterization at Larsemann Hills and Maitri, Antarctica, Sci. Total Environ., 584–585, 1130–1137, https://doi.org/10.1016/j.scitotenv.2017.01.173, 2017. 
Australian Bureau of Meteorology: Ozonesonde, World Ozone and Ultraviolet Radiation Data Centre [data set], https://woudc.org/data/explore.php (last access: 1 January 2024), 2023. 
Barrie, L. A., Bottenheim, J. W., Schnell, R. C., Crutzen, P. J., and Rasmussen, R. A.: Ozone destruction and photochemical reactions at polar sunrise in the lower Arctic atmosphere, Nature, 334, 138–141, https://doi.org/10.1038/334138a0, 1988. 
Bartusek, S., Wu, Y., Ting, M., Zheng, C., Fiore, A., Sprenger, M., and Flemming, J.: Higher-Resolution Tropopause Folding Accounts for More Stratospheric Ozone Intrusions, Geophys. Res. Lett., 50, e2022GL101690, https://doi.org/10.1029/2022GL101690, 2023. 
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We investigate surface ozone variability in East Antarctica based on measurements and EMAC global model simulations during austral summer. Nearly half of the surface ozone is found to be of stratospheric origin. The east coast of Antarctica acts as a stronger sink of ozone than surrounding regions. Photochemical loss of ozone is counterbalanced by downward transport of ozone. The study highlights the intertwined role of chemistry and dynamics in governing ozone variations over East Antarctica.
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