pack icepack ice
The floating sea-ice cover of the polar regions. Driven by winds and ocean currents, pack ice is a mixture of ice fragments of varying size and age that are squeezed together and cover the sea surface with little or no open water. At maximum expansion during the winter, pack ice covers about five percent of Arctic waters and about eight percent of Antarctic waters.
- The existence of these lands helps to account for the usual obstruction of pack-ice in the waters of the Nordenskjold Archipelago and the Kara Sea.
- Pack-ice forms regularly in the inner part of the Baltic every winter, but not in the Norwegian fjords.