Table 2 Mean number of ice-free days (IFD) between 1979 and 2020 for the Chukchi Sea (CS) and Southern Beaufort Sea (SBS) subpopulations (subpop) based on combinations of two different values of sea ice concentration (SIC) used to define sea ice extent (i.e., < 15% or < 30% SIC), two different definitions of the threshold used to define an IFD (i.e., < 15% or < 30% of 10-year March average sea ice concentration), and two delineations of the subpopulation boundaries (i.e., that used by Amstrup and Bitz²¹ and by Rode et al.²³). The scenarios included in Amstrup and Bitz²¹ are depicted in bold.

From: Model sensitivity limits attribution of greenhouse gas emissions to polar bear demographic rates