The salt content of sea ice is a major control on many climatically and biologically relevant processes (e.g., summer melting rates and surface albedo, the equilibrium thickness of multi-year ice, the formation of the brine channels that harbor microbial life in sea ice, the regulation of carbon fluxes between the atmosphere and ocean by maintaining brine network connectivity, the sea ice mechanical strength and, radiation scattering within the ice). In this project, we will study heat and brine fluxes through sea ice; two processes that are crucial for a better understanding of ice growth and melt dynamics.