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. Recent declines in Arctic sea ice and snow extent have led to an increase inthe absorption of solar energy at the surface, resulting in additionalsurface heating and a further decline in snow and ice. Using 34 years ofsatellite data, 1982–2015, we found that the positive trend in solarabsorption over the Arctic Ocean is more than double that over Arctic land,and the magnitude of the ice–albedo feedback is four times that of thesnow–albedo feedback in summer. The timing of the high-to-low albedotransition has shifted closer to the greater insolation of the summersolstice over ocean, but further away from the summer solstice over land.Therefore, decreasing sea ice cover, not changes in terrestrial snow cover,has been the dominant radiative feedback mechanism over the last few decades.

Arctic climate: changes in sea ice extent outweigh changes in snow cover