How can neXtSIM help us to understand the observed changes to Arctic multiyear ice in recent decades?

Speaker: 
Heather Reagan (Sea ice modelling group)
Seminar Date: 
22. September 2020 - 11:15 - 11:45
Location: 
Lecture room, Ground Floor, NERSC

As part of the FRASIL project, we are interested in the evolution of first year and multiyear ice in the Arctic. Satellite observations have shown a general decline in multiyear ice in recent decades, but the mechanisms behind this and the summertime behaviour of the multiyear ice extent cannot easily be inferred from these observations. To try to shed light on this, I’ve been using the neXtSIM sea ice model to track multiyear ice. In this presentation I will show how we try to define multiyear ice in a Lagrangian sea ice model in a way that makes sense physically and is consistent with observations, and present some initial findings in the context of these observations.