Volume 90 Issue 36 | p. 59 | Concentrates
Issue Date: September 3, 2012

Droplets From Mold May Seed Rain Forest Aerosols

Atmospheric particles arise from postassium-rich emissions from flora and fauna
Department: Science & Technology
News Channels: Environmental SCENE, Materials SCENE, Analytical SCENE, Biological SCENE
Keywords: aerosol, secondary organic aerosol, atmosphere, biogenic, fungus, potassium, clouds, climate, weather
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Mold activity in the Amazon rain forest may be the source of aerosol particles.
Credit: C. Pöhlker/Max Planck Institute for Chemistry
A white mist rises out of a tropical rainforest.
 
Mold activity in the Amazon rain forest may be the source of aerosol particles.
Credit: C. Pöhlker/Max Planck Institute for Chemistry

Organic aerosol particles that form in the air above the Amazon rain forest likely arise from potassium-rich droplets emitted from rain forest flora and fauna, especially molds (Science, DOI: 10.1126/science.1223264). So-called secondary organic aerosols form from oxidation of airborne organic gases and play key roles in weather and climate by seeding clouds and absorbing or scattering sunlight, but their origin and properties are poorly understood. A research group led by Christopher Pöhlker, Ulrich Pöschl, and Meinrat O. Andreae of Germany’s Max Planck Institute for Chemistry studied aerosols in the Amazon basin, far from urban emissions. They found that all particles contained potassium, from 20% by mass for particles 0.15 µm in diameter to 0.3% for particles 1 µm in diameter. The researchers propose that Amazonian organisms emit potassium-rich aqueous droplets that undergo multiphase chemical reactions to produce secondary organic components. Fungal species in particular are known to emit droplets containing potassium when they discharge spores. The group is now working to understand emission rates and mechanisms and to determine whether similar processes are at work in other environments.

 
Chemical & Engineering News
ISSN 0009-2347
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