In both cases we're talking about seasonal sea ice floating in a thin layer on the sea, next to cold and ice - covered land. (planet3.org)
Regardless of high uncertainty associated with such an estimate, it does provide a lower bound of the time range for projections of seasonal sea ice cover.» (theguardian.com)
Variability, trends, and predictability of seasonal sea ice retreat and advance in the Chukchi Sea. (nsidc.org)