Articles | Volume 21, issue 9
Atmos. Chem. Phys., 21, 6985–6997, 2021
https://doi.org/10.5194/acp-21-6985-2021

Special issue: Resolving uncertainties in solar geoengineering through multi-model...

Atmos. Chem. Phys., 21, 6985–6997, 2021
https://doi.org/10.5194/acp-21-6985-2021

Research article 07 May 2021

Research article | 07 May 2021

Robust winter warming over Eurasia under stratospheric sulfate geoengineering – the role of stratospheric dynamics

Antara Banerjee et al.

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Cited articles

Ayarzagüena, B., Charlton-Perez, A. J., Butler, A. H., Hitchcock, P., Simpson, I. R., Polvani, L. M., Butchart, N., Gerber, E. P., Gray, L., Hassler, B., Lin, P., Lott, F., Manzini, E., Mizuta, R., Orbe, C., Osprey, S., Saint-Martin, D., Sigmond, M., Taguchi, M., Volodin, E. M., and Watanabe, S.: Uncertainty in the Response of Sudden Stratospheric Warmings and Stratosphere-Troposphere Coupling to Quadrupled CO2 Concentrations in CMIP6 Models, J. Geophys. Res.-Atmos., 125, e2019JD032345, https://doi.org/10.1029/2019JD032345, 2020. 
Baldwin, M. P. and Dunkerton, T. J.: Stratospheric Harbingers of Anomalous Weather Regimes, Science, 294, 581–584, https://doi.org/10.1126/science.1063315, 2001. 
Baldwin, M. P. and Thompson, D. W. J.: A critical comparison of stratosphere-troposphere coupling indices, Q. J. Roy. Meteor. Soc., 135, 1661–1672, https://doi.org/10.1002/qj.479, 2009. 
Banerjee, A.: antara-banerjee/GeoengineeringLE_WinterWarming: Publication Code (Version v1.0.0), Zenodo, https://doi.org/10.5281/zenodo.4713591, 2021. 
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Short summary
We find that simulated stratospheric sulfate geoengineering could lead to warmer Eurasian winters alongside a drier Mediterranean and wetting to the north. These effects occur due to the strengthening of the Northern Hemisphere stratospheric polar vortex, which shifts the North Atlantic Oscillation to a more positive phase. We find the effects in our simulations to be much more significant than the wintertime effects of large tropical volcanic eruptions which inject much less sulfate aerosol.
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