Joanna Davies is a paleoceanographer whose research focuses on understanding how sea ice in the Arctic responded to climate change in the past. Using lipids produced by algae living in sea ice that are deposited onto the ocean floor when the ice melts, we can reconstruct sea ice changes back thousands or even millions of years ago. Joanna has taken part in numerous research cruises to the Arctic, to collect marine sediment cores used for this paleoclimate reconstructions. Joanna’s current project focuses on understanding the role that sea ice played in freshening the oceans in the past, which can have broad impacts on our global climate.