December 5, 2010, I posted my experiment to demonstrate that soot melts snow much more quickly than if the snow is clean. The "soot" came from old fireplace ashes. This is a realistic "real world" substance since much of the soot that reaches the Arctic comes from wood burning.
However, the climate models assume soot is carbon black. So, I was asked to repeat the experiment with lamp black. I did it earlier today.
Here is the virgin snow at 9am. Snow depth, 4 inches.
I spread the lamp black and measured four hours later.
The results of the experiment are the same -- the snow melts much more quickly in areas where the snow cover has been darkened than in areas that remain pristine.
The point is this: It is pollution from China (as indicated by four peer-reviewed papers) that has caused the rapid Arctic ice melt, not temperatures which have been colder than normal the last three melt seasons.