Large ozone enhancement over South Asia triggered by sudden stratospheric warming under westerly QBO phase: implications on ozone radiative forcing

Roy, Shubhajyoti; Chandran, Satheesh P. R.; Fadnavis, Suvarna; Sagar, Vijay; Hegglin, Michaela I.; Müller, Rolf; Chavan, Prashant

doi:10.5194/acp-26-7047-2026

Articles | Volume 26, issue 10

https://doi.org/10.5194/acp-26-7047-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue:

Exploring impacts of troposphere–stratosphere coupling...

https://doi.org/10.5194/acp-26-7047-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 26, issue 10

Research article

|

22 May 2026

Research article |

| 22 May 2026

Large ozone enhancement over South Asia triggered by sudden stratospheric warming under westerly QBO phase: implications on ozone radiative forcing

Shubhajyoti Roy, Satheesh P. R. Chandran, Suvarna Fadnavis, Vijay Sagar, Michaela I. Hegglin, Rolf Müller, and Prashant Chavan

Supplement

https://doi.org/10.5194/acp-26-7047-2026-supplement

Data sets

ERA5 hourly data on pressure levels from 1940 to present H. Hersbach et al. https://doi.org/10.24381/cds.bd0915c6

Model code and software

Large Ozone Enhancement over South Asia Triggered by Sudden Stratospheric Warming under Westerly QBO phase: Implications on Ozone Radiative Forcing S. Roy et al. https://doi.org/10.5281/zenodo.17639489

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Short summary

We show that stratospheric ozone intrusions associated with sudden stratospheric warming events occurring concurrent with the westerly phase of the Quasi-biennial oscillation enhance ozone in the upper troposphere and lower stratosphere over South Asia. The ozone enhancement increases ozone radiative forcing by 0.09±0.05 W m^-2 over South Asia. This increase in ozone radiative forcing potentially exacerbates regional climate warming.