Extended Data Fig. 1: Scaling diatom relative abundances to sea-ice presence.
From: Multi-decadal trends in Antarctic sea-ice extent driven by ENSO–SAM over the last 2,000 years
a, Raw relative abundances of the Open Water Diatom (OWD) group in core DTCI2010 off Adélie Land (black line)15 and resampled relative abundances of the OWD group at a 1 year resolution (red line). b, Resampled relative abundance of the OWD group at a 1 year resolution (red line) compared to the length of the yearly sea-ice free season off Adélie Land between 1979 and 2010 (blue line)15. Grey shaded boxes represent the upper and lower end members used to scale the relative abundances of the OWD group to the yearly open water length. c, The mean upper and lower end members used to calculate the equation to scale the OWD group relative abundances to the length of the open season.
