Found: Why rain gives off aromatic earthy smell

WASHINGTON: MIT scientists have identified the mechanism that releases an earthy smell in the air after light rain. Using high-speed cameras, the researchers at the Massachusetts Institute of Technology observed that when a raindrop hits a porous surface, it traps tiny air bubbles at the point of contact. As in a glass of champagne, the bubbles then shoot upward, ultimately bursting from the drop in a fizz of aerosols. The team was also able to predict the amount of aerosols released, based on the velocity of the raindrop and the permeability of the contact surface.

The researchers suspect that in natural environments, aerosols may carry aromatic elements, along with bacteria and viruses stored in soil.These aerosols may be released during light or moderate rainfall, and then spread via gusts of wind.

Youngsoo Joung, a postdoc in the lab of Cullen R Buie, an assistant professor at MIT, said now that the mechanism for such aerosol generation has been identified, the results may help to explain how certain soil-based diseases spread.

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