Tropopause Polar Vortices (TPVs) are coherent vortices which occur north and away from midlatitude jet stream. They are based on tropopause .There are many motivation to study them is to understand the connection between Arctic, Sea Ice and TVPS from predictability point of view
Arctic cyclones are synoptic-scale cyclones that are present poleward of 60N latitude. The summer is a unique season for Arctic cyclones because they are more numerous and more frequently generated within the Arctic. They often form when a TPV moves over the Arctic Frontal Zone or over marginal sea ice regions. ... During the winter, Arctic cyclones are less frequent and most often move into the Arctic from midlatitudes. Fundamental questions exist regarding Arctic cyclones, such as their large horizontal scale (reaching up to 5000 km) and long lifetimes (up to several weeks) that contrasts theory given that the large planetary vorticity of the high latitudes and is also in contrast to smaller-scale cyclones that are sometimes observed called polar lows. Past research has also revealed different viewpoints on the dynamics of these systems with some studies suggesting that intensifying Arctic cyclones have a sustained equivalent barotropic structure for extended periods of time with vertical alignment between the surface low and TPV.
Our group utilizes ensemble data assimilation techiques to help build our understanding of the processes that are represented in numerical models and improve the capability of numerical weather prediction. The Antarctic is of particular interest to our group since it is the most data sparse region of the globe.
Radiative Impact on Tropopause Polar Vortices over the Arctic