1980–2014 breakup and freeze-up timing for the three sections of the shipping corridor. This time series shows breakup (open circles) and freeze-up (solid circles) on the Hudson Bay, Hudson Islands, and Hudson Strait sections of the corridor between 1980 and 2014, where data points indicate the annual median values of all pixels in a corridor section. The slope of each regression line is significant at the 99% confidence level. Slope units are days year^–1. Characteristics of the datasets and regression lines are displayed in Table 3. DOI: https://doi.org/10.1525/elementa.130.f5