New research finds that a record Arctic sea ice melt season in 2007 initiated a “regime shift” to thinner, more transient ice that may be “irreversible”; another study shows that atmospheric rivers from the south are warming the Arctic in winter.
Temperatures in parts of the Arctic were six degrees or more above average in February. Researchers are observing that the ice is thinning rapidly - and models predict that ice-free Arctic summers are on the horizon. In this special edition Climate Now reports from a -24C freezer in Tromsø, Norway.