The phrase "ice edge" refers to the boundary where solid ice meets open water, usually in oceans or large bodies of water. It marks the transition from areas covered in ice to areas that are free of ice.
Ensemble decadal prediction simulations using the Community Earth System Model (CESM) can skillfully predict past decadal rates of Atlantic winter sea ice change because they do well at predicting THC - driven ocean heat content change in the vicinity of the winter sea ice edge in the Labrador, Greenland, Irminger, and Barents Seas. (usclivar.org)
-- The sea ice edge positions in the North Atlantic, between 1850 and 1978, derived from various sources, including newspapers, ship observations, aircraft observations, diaries and more. (dotearth.blogs.nytimes.com)
The predicted ice thickness fields and ice edge locations for July, August, and October 2016 are also presented. (arcus.org)