Hemispheric differences in ozone across the stratosphere–troposphere exchange region

Seguel, Rodrigo J.; Opazo, Charlie; Cohen, Yann; Cooper, Owen R.; Gallardo, Laura; Sinnhuber, Björn-Martin; Obersteiner, Florian; Zahn, Andreas; Hoor, Peter; Rohs, Susanne; Marsing, Andreas

doi:https://doi.org/10.5194/acp-25-8553-2025

Articles | Volume 25, issue 15

https://doi.org/10.5194/acp-25-8553-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue:

Tropospheric Ozone Assessment Report Phase II (TOAR-II) Community...

https://doi.org/10.5194/acp-25-8553-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 25, issue 15

Research article

|

07 Aug 2025

Research article |

| 07 Aug 2025

Hemispheric differences in ozone across the stratosphere–troposphere exchange region

Rodrigo J. Seguel, Charlie Opazo, Yann Cohen, Owen R. Cooper, Laura Gallardo, Björn-Martin Sinnhuber, Florian Obersteiner, Andreas Zahn, Peter Hoor, Susanne Rohs, and Andreas Marsing

Supplement

https://doi.org/10.5194/acp-25-8553-2025-supplement

Data sets

IAGOS-CARIBIC MS files collection (v2024.10.28) A. Zahn et al. https://doi.org/10.5281/zenodo.8188548

Index of /archive/Archive-NewFormat/OzoneSonde_1.0_1/stn339/ecc WOUDC http://woudc.org/archive/Archive-NewFormat/OzoneSonde_1.0_1/stn339/ecc

Harmonization and Evaluation of Ground-based Instruments for Free Tropospheric Ozone Measurements (HEGIFTOM) TOAR-II HEGIFTOM Focus Working Group https://hegiftom.meteo.be

CAMS global reanalysis (EAC4) Copernicus Atmosphere Monitoring Service https://doi.org/10.24381/d58bbf47

ERA5 post-processed daily-statistics on pressure levels from 1940 to present H. Hersbach et al. https://doi.org/10.24381/cds.50314f4c

SouthTRAC mission HALO Database https://halo-db.pa.op.dlr.de/mission/116

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Short summary

We explored ozone differences between the Northern Hemisphere and Southern Hemispheres in the upper troposphere–lower stratosphere. We found lower ozone (with stratospheric origin) in the Southern Hemisphere, especially during years of severe ozone depletion. Sudden stratospheric warming events increased the ozone in each hemisphere, highlighting the relationship between stratospheric processes and ozone in the upper troposphere, where ozone is an important greenhouse gas.