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Monitoring Sea Ice. It has been a focus of attention in recent years, largely because of a strong decrease in the Arctic sea ice cover and modeling results that indicate that global warming could be amplified in the Arctic on account of ice-albedo feedback. It’s been shrinking by about 13.4% per decade relative to the 1981 to 2010 average, and the summer of 2012 marked a new record low.

Arctic Ocean | Western Arctic | Eastern Arctic | Hudson Bay | East Coast | Great Lakes. Full resolution map | Animated map (last 10 days) This map combines the latest ice information available from Canadian Ice Service charts. Scientists are keeping a close eye on Arctic sea ice as the Arctic warms. Other, scattered records of Arctic sea ice date back to the mid-1700s, when sailors kept notes on Northern Hemisphere shipping lanes. Arctic Sea Ice. Dating back to A.D. 870, intermittent records assembled by the Vikings record the number of weeks per year that ice occurred along the north coast of Iceland. Because there is no landmass at the North Pole, sea ice extends all the way to the pole, making the ice subject to the most extreme oscillations between wintertime darkness and summertime sunlight. The sea ice cover is one of the key components of the polar climate system. Arctic sea ice occupies an ocean basin mostly enclosed by land. This ice information is updated daily in areas of known marine activity. Climate models do predict that Antarctic sea ice will respond more slowly than Arctic sea ice to warming, but as temperatures continue to rise, a long-term decline is expected. The variability in Antarctic sea ice patterns makes it harder for scientists to explain Antarctic sea ice trends and to predict how Southern Hemisphere sea ice may change as greenhouse gases continue to warm the Earth. Multiyear ice is disappearing, a real concern because it is the only year-round ice habitat and will likely be impossible to replace if the Arctic continues to warm.

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