Where does the soot come from that peppers Juneau Icefield?

Hardcore science: Jason Fellman, research assistant at University of Alaska Southeast, opens one of the freezers containing snow and ice samples taken from the Juneau Icefield. (Photo by Matt Miller, KTOO – Juneau)Scientists this year started sampling the snow and ice above Southeast Alaska’s glaciers for the particles left from over from forest fires, diesel engines and industrial activity. The particles of black carbon can accelerate warming of glaciers and the atmosphere.
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