Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 25, issue 18
Articles | Volume 25, issue 18
https://doi.org/10.5194/acp-25-10887-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-25-10887-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 25, issue 18
Research article
 | 
22 Sep 2025
Research article |  | 22 Sep 2025

Evidence of a transient ozone depletion event in the early Hunga plume above the Indian Ocean

Tristan Millet, Hassan Bencherif, Thierry Portafaix, Nelson Bègue, Alexandre Baron, Valentin Duflot, Cathy Clerbaux, Pierre-François Coheur, Andrea Pazmiño, Michaël Sicard, Anne Boynard, Jean-Marc Metzger, Guillaume Payen, Nicolas Marquestaut, and Sophie Godin-Beekmann

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Short summary
On 15 January 2022, the Hunga volcano erupted, releasing sulfur dioxide and water vapor into the stratosphere, impacting ozone levels over the Indian Ocean. Satellite data show the presence of a transient ozone depletion event related to the water vapor anomalies and sulfate aerosol clouds. Ozone reduction was confined to two distinct layers. On 21 January, the fifth percentile of total and stratospheric column ozone anomalies reached −18.6 and −14.5 DU, respectively.
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