Iodine from Desert Dust Decreases Ozone Air Pollution, New Study Shows chemistry geoscience science
Iodine, the same chemical added as a nutrient to table salt, is an atmospheric trace element emitted from oceans that efficiently destroys ozone. Low ozone in airborne dust layers is frequently observed but poorly understood. New research led by the University of Colorado, Boulder, shows that dust is a source of iodine, indicated by aircraft observations of iodine monoxide ions inside lofted dust layers from the Atacama and Sechura deserts in Chile and Peru.
By contrast, lab experiments have long shown that a gaseous form of iodine can gobble up ozone, but there were only hints of a connection between dust and iodine. “So the picture is another blurry one, but still, the science is sharper than it was. I have more questions at the end of the project than at the start. But they’re better, more specific questions,” Koenig said.
“Perhaps more importantly, various geoengineering ideas involve injecting dust particles high into Earth’s atmosphere, to reflect incoming solar radiation.”
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