Scientists take the most accurate measurements yet of black carbon in the atmosphere. Our industrialized civilization contributes a broad array of pollutants to the environment. A significant source of these pollutants is combustion, which leads to the production of aerosol particles, including bla
Transmission electron microscope images of laboratory powder samples. Clockwise from top left, fullerene soot, black carbon aggregate from vehicle exhaust, Hematite-TD and Hematite-KJ. Credit: 2023 Moteki et al.Our industrialized civilization contributes a broad array of pollutants to the environment. A significant source of these pollutants is combustion, which leads to the production of aerosol particles, including black carbon.
At the same time, given dark colors are less effective at reflecting light and therefore heat, as black carbon covers lighter surfaces including snow, it reduces the potential of those surfaces to reflect heat back into space. Transmission electron microscope images of ambient aerosols collected by an aerosol-impactor sampler installed on the research vessel Shinsei Maru. Red arrows indicate individual black carbon aggregates, most of which were mixed with sulfate and/or organic materials . Credit: 2023 Moteki et al.
“We measured the amplitude, or strength, and phase, or step, of the light scattered from black carbon samples isolated in water,” said Moteki. “This allowed us to calculate what is known as the complex refractive index of black carbon. Complex because rather than being a single number, it’s a value that contains two parts, one of which is ‘imaginary’ , though its impact is very, very real.
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