Your albedo change represents a value of about 0.17 W / m ^ 2, which if correct, would make Arctic sea ice reduction in recent years potentially a major contributor to ongoing imbalances. (judithcurry.com)
To say nothing of the warming trends also noticed in, for example: * ocean heat content * wasting glaciers * Greenland and West Antarctic ice sheet mass loss * sea level rise due to all of the above * sea surface temperatures * borehole temperatures * troposphere warming (with stratosphere cooling) * Arctic sea ice reductions in volume and extent * permafrost thawing * ecosystem shifts involving plants, animals and insects (wattsupwiththat.com)
Petrich (University of Alaska Fairbanks); 4.0 Million Square Kilometers, with a possible range of 3.4 to 5.4 million square kilometers, likely range of 3.4 to 4.9 million square kilometers; Heuristic, Statistical June sea level pressure (SLP) is related to both surface winds and clouds, which are known to drive arctic sea ice reduction in summer. (searcharcticscience.org)