AI Article Synopsis
- The mechanism of new particle formation primarily studied is ion-mediated sulfuric acid and ammonia clustering, but recent research highlights the potential of iodine-driven nucleation, especially in coastal regions.
- Laboratory observations indicate that iodine species play a significant role in particle formation, adding to our understanding of atmospheric chemistry in these areas.
- The study shows that incorporating iodine into particle formation models enhances the prediction of Aitken mode particle sizes and can significantly boost cloud condensation nuclei concentrations under specific weather conditions.
Article Abstract
New particle formation via the ion-mediated sulfuric acid and ammonia molecular clustering mechanism remains the most widely observed and experimentally verified pathway. Recent laboratory and molecular level observations indicate iodine-driven nucleation as a potentially important source of new particles, especially in coastal areas. In this study, we assess the role of iodine species in particle formation using the best available molecular thermochemistry data and coupled to a detailed 1-d column model which is run along air mass trajectories over the Southern Ocean and the coast of Antarctica. In the air masses traversing the open ocean, ion-mediated SA-NH clustering appears insufficient to explain the observed particle size distribution, wherein the simulated Aitken mode is lacking. Including the iodine-assisted particle formation improves the modeled Aitken mode representation with an increase in the number of freshly formed particles. This implies that more particles survive and grow to Aitken mode sizes via condensation of gaseous precursors and heterogeneous reactions. Under certain meteorological conditions, iodine-assisted particle formation can increase cloud condensation nuclei concentrations by 20%-100%.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11064213 | PMC |
| http://dx.doi.org/10.1021/acs.est.3c09103 | DOI Listing |
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