Nanna Andreasen is a Ph.D. student at Niels Bohr Institute at the Department of Physics of Ice, Climate and Earth. She has an MSc in Geology-Geoscience from the University of Copenhagen. As a geologist, she has studied how landscape and ocean sediments capture information about past climate changes. She has long had a great interest in Arctic paleoclimate science and has worked with reconstructing the Arctic Holocene climate. Her Ph.D. project focuses on reconstructing the Holocene climate from diatoms in Greenland and the Canadian Arctic ice cores. Diatoms are microfossils that can tell of the past environment. By studying the ice cores, she and her group will retrieve a multi-proxy reconstruction of the past Arctic sea ice conditions and past climatic conditions. Nanna is developing a new proxy for sea ice variability based on diatoms in the ice cores.

The Arctic is warming four times as fast as the rest of the globe. To understand how the planet reacts to future atmospheric changes, there is a need to go back in time. Ice cores have preserved part of this story, and Nanna is interested in unravelling this information and telling the story.