Our Research

Arctic cyclones are synoptic-scale cyclones that are present poleward of 60°N latitude. Summer is a unique season for Arctic cyclones as they are more numerous and more frequently generated within the Arctic, often forming when a TPV moves over the Arctic Frontal Zone or over marginal sea ice regions.

During winter, Arctic cyclones are less frequent and most often move into the Arctic from midlatitudes. Fundamental questions exist regarding their large horizontal scale (reaching up to 5000 km) and long lifetimes (up to several weeks), which contrasts with theory given the large planetary vorticity of high latitudes.

Our research explores 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 with vertical alignment between the surface low and TPV.

Our group utilizes ensemble data assimilation techniques 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. By applying advanced data assimilation methods, we can better constrain model forecasts and gain insights into the fundamental dynamics of Antarctic weather systems.

The Arctic provides favorable conditions for the growth and evolution of Tropopause Polar Vortices (TPVs). The dynamics of TPVs lead to surface cyclone development, which in turn plays a significant role in the dynamics of Arctic sea ice.

Understanding these atmosphere-ice interactions is crucial for improving our ability to predict both short-term weather events and longer-term changes in the Arctic climate system. Our research examines the feedback mechanisms between atmospheric circulation patterns and sea ice distribution.