change in the Arctic Ocean for primary productivity, biodiversity and trophic transfer efficiency. Assess the potential of macroalgae for long-term carbon dioxide removal and storage in the ocean. Current Projects: [...] new production. In addition, ocean warming causes changes in the winter mixed layer in the Northern Atlantic, causing the amount of silicic acid entering the Arctic Ocean to decline in the last decades [...] consequences of declining silicic acid on the Arctic marine ecosystem and the responsible underlying mechanisms. To understand how climate changes impacts the Arctic Ocean, we will combine novel and classical