Extended Data Fig. 2: Sea-ice duration off Adélie Land over the last 2000 years.
From: Multi-decadal trends in Antarctic sea-ice extent driven by ENSO–SAM over the last 2,000 years
Length of the sea-ice free season (orange line) calculated by applying the equation presented in Extended Data Fig. 1c to the relative abundances of the OWD group in IODP Hole U1357B and length of the sea-ice duration calculated (blue line) by subtracting the ice-free values from 365 days.