The 2020 Arctic marine heatwave (IMAGE) University of Hamburg Caption The figure shows the most powerful heatwave in the Arctic Ocean to date in 2020, which continued for 103 days. The cumulative heat intensity sums up the daily anomalies in water temperature recorded over the duration of the heat wave in degrees Celsius. Credit UHH/CLICCS/A. Barkhordarian Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. License CC BY-NC Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.