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Researchers have now conducted precise calculations that clear up uncertainty about how much biological aerosols contribute to this process above the Arctic.Stockholm University physicist Gabriel Freitas and colleagues filtered micrometer-sized materials from the atmosphere above the observatory on Zeppelinfjellet mountain in Norway.
Floating high amongst the atmospheric gasses, dust, and water vapor, the researchers detected biologically derived particles. These included fructose as well as the sugar alcohols"While arabitol and mannitol are present in various microorganisms, their presence in air are related to fungal spores, and might originate both from local sources or from long range atmospheric transport,"The level of the biological aerosols fluctuated with the seasons, Freitas and colleagues note.
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