Brown Carbon from Wildfires: Global Warming Underestimated

Brown Carbon: A Major Player in Climate Warming

Wildfires, natural events increasingly frequent and intense due to climate change, release numerous particles into the atmosphere. Among these, brown carbon, resulting from incomplete combustion of biomass, is now identified as a significant contributor to climate warming. An international study published in the prestigious Nature Geoscience journal highlights the extent of its impact, suggesting that its warming effect could be as important, or even greater, than that of black carbon, another particle from combustion better known for its ability to absorb solar light and thus warm the atmosphere.

This complex organic compound, scientifically named 'organic particulate dark carbon,' is formed when vegetation, such as trees and shrubs, burns without being completely consumed. This process creates particles that, once in the atmosphere, absorb solar radiation. Unlike black carbon, primarily composed of soot, brown carbon is a mixture of organic compounds. Its dark color gives it a strong ability to absorb visible light, thereby transforming solar radiation into heat. The researchers used advanced spectroscopy techniques to precisely measure the light absorption by these particles, revealing their warming potential.