Articles | Volume 25, issue 21
https://doi.org/10.5194/acp-25-14237-2025
https://doi.org/10.5194/acp-25-14237-2025
Research article
 | 
30 Oct 2025
Research article |  | 30 Oct 2025

Mechanistic insights into nitric acid-enhanced iodic acid particle nucleation in the upper troposphere and lower stratosphere

Jing Li, An Ning, Ling Liu, Fengyang Bai, Qishen Huang, Pai Liu, Xiucong Deng, Yunhong Zhang, and Xiuhui Zhang

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Short summary
Iodic acid (IA) particles are frequently observed in the upper troposphere and lower stratosphere (UTLS), yet their formation mechanism remains unclear. Nitric acid (NA) and ammonia (NH3) are key nucleation precursors in the UTLS. This study investigates the IA–NA–NH3 system using a theoretical approach. Our proposed nucleation mechanism highlights the crucial role of NA in IA nucleation, providing molecular-level evidence for the missing sources of IA particles in the UTLS.
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