Preprints
https://doi.org/10.5194/egusphere-2023-1774
https://doi.org/10.5194/egusphere-2023-1774
17 Oct 2023
 | 17 Oct 2023

Rapid Iodine Oxoacids Nucleation Enhanced by Dimethylamine in Broad Marine Regions

Haotian Zu, Biwu Chu, Yiqun Lu, Ling Liu, and Xiuhui Zhang

Abstract. Recent experiment (He et al, 2021, Science) revealed a vital nucleation process of iodic acid (HIO3) and iodous acid (HIO2) under the marine boundary layer conditions. However, HIO3-HIO2 nucleation cannot effectively derive the observed rapid new particle formation (NPF) in broad marine regions. Dimethylamine (DMA) is a promising basic precursor to enhance nucleation considering its strong ability to stabilize acidic clusters and the wide distribution in marine atmosphere, while its role in HIO3-HIO2 nucleation remains unrevealed. Hence, a method combining quantum chemical calculations and Atmospheric Cluster Dynamics Code (ACDC) simulations was utilized to study the HIO3-HIO2-DMA nucleation process. We found that DMA can compete with HIO2 to accept the proton from HIO3 as a basic precursor in the most stable configurations of HIO3-HIO2-DMA clusters. DMA can significantly enhance the cluster formation rates of HIO3-HIO2 kinetically for more than 103-fold in regions with abundant amine and scarce iodine based on combined factors of high nucleation ability and high concentration of DMA. Furthermore, the iodine oxoacids nucleation enhanced by DMA may explain the sources of rapid NPF events under different conditions corresponding to multiple ocean regions, which can provide important inspirations to understand the frequent and intensive NPF events in broad marine regions.

Haotian Zu, Biwu Chu, Yiqun Lu, Ling Liu, and Xiuhui Zhang

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-1774', Jonas Elm, 24 Oct 2023
    • AC1: 'Reply on RC1', Xiuhui Zhang, 24 Feb 2024
  • RC2: 'Comment on egusphere-2023-1774', Anonymous Referee #1, 14 Dec 2023
    • AC2: 'Reply on RC2', Xiuhui Zhang, 24 Feb 2024

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-1774', Jonas Elm, 24 Oct 2023
    • AC1: 'Reply on RC1', Xiuhui Zhang, 24 Feb 2024
  • RC2: 'Comment on egusphere-2023-1774', Anonymous Referee #1, 14 Dec 2023
    • AC2: 'Reply on RC2', Xiuhui Zhang, 24 Feb 2024
Haotian Zu, Biwu Chu, Yiqun Lu, Ling Liu, and Xiuhui Zhang
Haotian Zu, Biwu Chu, Yiqun Lu, Ling Liu, and Xiuhui Zhang

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Short summary
The nucleation process of iodic acid (HIO3) and iodous acid (HIO2) was proved to be critical in marine areas. However, HIO3-HIO2 nucleation cannot effectively derive the observed rapid new particle formation in broad marine areas. We show the extensive participation of dimethylamine (DMA) in HIO3-HIO2 nucleation and find a significant enhancement of DMA on the HIO3-HIO2 nucleation, which establishes reasonable connections between the iodine oxoacids nucleation and the rapid marine new particles.