That's for new soot depositing on ordinary, existing glaciers with previously high albedo. That causes a spiraling feedback effect of more forest fires and acce

That's for new soot depositing on ordinary, existing glaciers with previously high albedo. That causes a spiraling feedback effect of more forest fires and accelerating glacier melt, It's probable that these dark glaciers are mostly sludge with only a bit of ice. We won't know until some field researchers go out there and gather data and samples.