Driving mechanisms for the El Niño–Southern Oscillation impact on stratospheric ozone

Benito-Barca, Samuel; Calvo, Natalia; Abalos, Marta

doi:https://doi.org/10.5194/acp-22-15729-2022

Articles | Volume 22, issue 24

https://doi.org/10.5194/acp-22-15729-2022

© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-22-15729-2022

© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 22, issue 24

Research article

|

15 Dec 2022

Research article |

| 15 Dec 2022

Driving mechanisms for the El Niño–Southern Oscillation impact on stratospheric ozone

Samuel Benito-Barca, Natalia Calvo, and Marta Abalos

Supplement

https://doi.org/10.5194/acp-22-15729-2022-supplement

Data sets

Japanese 55-year Reanalysis, Monthly Means and Variances. Research Data Archive at the National Center for Atmospheric Research Japan Meteorological Agency/Japan https://doi.org/10.5065/D60G3H5B

MERRA-2 tavgM_2d_slv_Nx: 2d,Monthly mean,Time-Averaged,Single-Level, Assimilation, Single-Level Diagnostics V5.12.4 Global Modeling and Assimilation Office https://doi.org/10.5067/AP1B0BA5PD2K

Chemistry \& Climate Processes: Products, SWOOSH: Stratospheric Water and OzOne Satellite Homogenized data set CSL https://www.esrl.noaa.gov/csd/groups/csd8/swoosh/

Atmospheric Chemistry observations \& modeling NCAR https://www2.acom.ucar.edu/gcm/ccmi-output

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Short summary

The impact of different El Niño flavors (eastern (EP) and central (CP) Pacific El Niño) and La Niña on the stratospheric ozone is studied in a state-of-the-art chemistry–climate model. Ozone reduces in the tropics and increases in the extratropics when an EP El Niño event occurs, the opposite of La Niña. However, CP El Niño has no impact on extratropical ozone. These ozone variations are driven by changes in the stratospheric transport circulation, with an important contribution of mixing.