Final answer:
Black Carbon on snow results in a positive radiative forcing (RF). When black carbon particles settle on snow, they decrease the snow's albedo, causing it to absorb more solar radiation and melt faster.
Step-by-step explanation:
Black Carbon on snow results in a positive radiative forcing (RF).
Black objects, including black carbon, absorb more solar radiation and have a higher albedo than white objects. When black carbon particles settle on snow, they decrease the snow's albedo, causing it to absorb more solar radiation and melt faster. This leads to a positive radiative forcing, contributing to global warming.