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Role of iodine oxoacids in atmospheric aerosol nucleation
Ist Teil von
Science (American Association for the Advancement of Science), 2021-02, Vol.371 (6529), p.589-595
Ort / Verlag
United States: The American Association for the Advancement of Science
Erscheinungsjahr
2021
Link zum Volltext
Quelle
American Association for the Advancement of Science
Beschreibungen/Notizen
Iodic acid (HIO
) is known to form aerosol particles in coastal marine regions, but predicted nucleation and growth rates are lacking. Using the CERN CLOUD (Cosmics Leaving Outdoor Droplets) chamber, we find that the nucleation rates of HIO
particles are rapid, even exceeding sulfuric acid-ammonia rates under similar conditions. We also find that ion-induced nucleation involves IO
and the sequential addition of HIO
and that it proceeds at the kinetic limit below +10°C. In contrast, neutral nucleation involves the repeated sequential addition of iodous acid (HIO
) followed by HIO
, showing that HIO
plays a key stabilizing role. Freshly formed particles are composed almost entirely of HIO
, which drives rapid particle growth at the kinetic limit. Our measurements indicate that iodine oxoacid particle formation can compete with sulfuric acid in pristine regions of the atmosphere.