Stratospheric Aerosol Injection (SAI) is a stopgap measure proposed to mitigate some of the negative impacts of rising greenhouse gas (GHG) levels by reducing surface temperatures through the injection of aerosol precursors into the stratosphere. Yet, despite offsetting global mean surface temperature, various studies demonstrated that SAI would also alter atmospheric circulation in a manner different to that arising from the climate change alone, thereby potentially playing an important role in modulating regional and seasonal climate variability (e.g., Banerjee et al., 2021;Simpson et al., 2019). Recent studies showed that warming in the tropical lower stratosphere brought about by the absorption of solar and terrestrial radiation by sulfate aerosols can drive a strengthening of the stratospheric polar vortex in the Northern Hemisphere during winter (e.g., Banerjee et al., 2021;Ferraro et al., 2015;Jones et al., 2022). The response manifests at the surface as a positive phase of the Northern Annular Mode (NAM), for the Atlantic sector only known also as the North Atlantic Oscillation, with consequences for winter surface temperatures and precipitation patterns in Europe and North America (Thompson & Wallace, 1998).Potential SAI impacts on the Southern Hemisphere (SH) counterpart -the Southern Annular Mode (SAM), also known as the Antarctic Oscillation -have not, however, so far received much attention. The SAM is the dominant