The stratospheric polar vortex under future climate change scenariosFifnja, Manca (Avtor) Skok, Gregor (Mentor) Karami, Khalil (Komentor) polar vortexsudden stratospheric warmingsgeoengineeringclimate changeThe term polar vortex represents an area of cold polar air and low pressure that encircles the pole in mid or high latitudes and is bounded by strong planetary-scale westerly flow. Two distinct polar vortices can be found in the Earth’s atmosphere: a tropospheric and a stratospheric polar vortex. While the tropospheric polar vortex exists all year round, the stratospheric polar vortex only appears in the winter months. The breakdown of the stratospheric polar vortex is represented by the reversal of zonal mean zonal wind (ZMZW) and is called a Sudden stratospheric warming (SSW) event. Such events can also have an impact on weather at the surface. Just like many other atmospheric features, polar vortices are nowadays being affected by global warming. Scientists are trying to research ways of deliberate intervention in the Earth’s natural systems to help reduce the effects of global warming. This process is called geoengineering and one of the proposed techniques are stratospheric aerosols, which represent injecting small, reflective particles into the upper atmosphere. This technique was also used in Stratospheric Aerosol Geoengineering Large Ensemble Project (GLENS) simulation. In this work we analyze data from GLENS simulation to observe the influence of increased amount of greenhouse gases and geoengineering on the stratospheric polar vortex. With the analysis of zonal mean temperature (ZMT), ZMZW and potential vorticity (PV) fields we found that the stratospheric polar vortex became stronger in both hemispheres in both future climates. We also found that there was no important change in the onset date of the final SSW event in the Northern hemisphere (NH). With the analysis of major mid-winter SSW events, we found that the change in the onset date was unimportant, but the frequency of such events has also changed.20222022-09-30 08:15:02Magistrsko delo/naloga141495VisID: 128389COBISS_ID: 123509763sl