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Iodine oxoacids enhance nucleation of sulfuric acid particles in the atmosphere.
- Source :
-
Science . 12/15/2023, Vol. 382 Issue 6676, p1308-1314. 7p. 4 Graphs. - Publication Year :
- 2023
-
Abstract
- The main nucleating vapor in the atmosphere is thought to be sulfuric acid (H2SO4), stabilized by ammonia (NH3). However, in marine and polar regions, NH3 is generally low, and H2SO4 is frequently found together with iodine oxoacids [HIOx, i.e., iodic acid (HIO3) and iodous acid (HIO2)]. In experiments performed with the CERN CLOUD (Cosmics Leaving OUtdoor Droplets) chamber, we investigated the interplay of H2SO4 and HIOx during atmospheric particle nucleation. We found that HIOx greatly enhances H2SO4(-NH3) nucleation through two different interactions. First, HIO3 strongly binds with H2SO4 in charged clusters so they drive particle nucleation synergistically. Second, HIO2 substitutes for NH3, forming strongly bound H2SO4-HIO2 acid-base pairs in molecular clusters. Global observations imply that HIOx is enhancing H2SO4(-NH3) nucleation rates 10- to 10,000-fold in marine and polar regions. [ABSTRACT FROM AUTHOR]
- Subjects :
- *NUCLEATION
*ATMOSPHERIC nucleation
*RATE of nucleation
*IODINE
*MOLECULAR clusters
Subjects
Details
- Language :
- English
- ISSN :
- 00368075
- Volume :
- 382
- Issue :
- 6676
- Database :
- Academic Search Index
- Journal :
- Science
- Publication Type :
- Academic Journal
- Accession number :
- 174225093
- Full Text :
- https://doi.org/10.1126/science.adh2526