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Pack ice, any area of sea ice (ice formed by freezing of seawater) that is not landfast; it is mobile by virtue of not being attached to the shoreline or something else. Pack ice expands in the winter and retreats in the summer in both hemispheres to cover about 5 percent of the northern oceans and
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Pack Ice Oceanwide Expeditions
Understanding climate: Antarctic sea ice extent
Arctic Sea Ice Shrinks to Smallest Extent Ever Recorded – Mother Jones
Arctic
See the otherworldly beauty of Earth's polar regions
Understanding climate: Antarctic sea ice extent
Arctic vs. Antarctic ice melt – DW – 06/14/2017
The Acceleration of an Antarctic Glacier Shows How Global Warming
Ice Ice Stories: Dispatches From Polar Scientists
Antarctica Is Undergoing a “Regime Shift” – New Research Uncovers
