Albedo is a measure of how much sunlight is reflected from the clouds and the surface. The greater the albedo, the more sunlight is reflected.
Greenies claim that less white, reflective, ice in the Arctic will cause the surface to absorb more heat and exacerbate Global Warming.
This is patently absurd because there is so little heat to absorb – the sun barely gets above the horizon!
This article takes the claim seriously and completely and comprehensively debunks it – NEXT!
Weekly Area of Snow Extent
Posted on October 18, 2013
Guest Post by Willis Eschenbach
” …One thing that is highlighted by this map is that the positive feedback from the changes in sea ice are much smaller than the feedback from the changes in snow and ice on land, for several reasons.
The first one is the small area of the sea ice variations. Note that the feedback is only in the areas that are seasonally uncovered and covered by sea ice—permanently ice-covered areas don’t have much albedo change. Net annual variation in Arctic sea ice is about ± 5 million square kilometres. This is only about 1% of the area of the globe.
Another reason the changes on land are larger is that when snow melts, it exposes soil and plants, both of which have low albedos. But when sea ice melts, it reveals ocean … and the albedo of the ocean at low sun angles is already pretty high. As a result, the melting of the ice doesn’t change the albedo as much as the melting of the snow…. “