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

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

doi:https://doi.org/10.5194/acp-24-1979-2024

Articles | Volume 24, issue 3

https://doi.org/10.5194/acp-24-1979-2024

© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-24-1979-2024

© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 24, issue 3

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

Supplement

https://doi.org/10.5194/acp-24-1979-2024-supplement

Data sets

Surface Ozone at Indian station Bharati Imran A. Girach and Andrea Pozzer https://spl.gov.in/SPLv2/images/SPL-METADATA/Girach_et_al_2024_ACP_Ozone_Bharati_Antarctica.xlsx

Ozonesonde Australian Bureau of Meteorology https://woudc.org/data/explore.php

Surface ozone at South Pole, United States; Arrival Heights, New Zealand; Marambio, Argentina; Syowa, Japan World Data Centre for Reactive Gases https://ebas-data.nilu.no/Default.aspx

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Short summary

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.