Preprints
https://doi.org/10.5194/acp-2021-831
https://doi.org/10.5194/acp-2021-831

  19 Oct 2021

19 Oct 2021

Review status: this preprint is currently under review for the journal ACP.

The Role of Organic Acids in New Particle Formation from Methanesulfonic Acid and Methylamine

Rongjie Zhang1, Jiewen Shen1, Hong-Bin Xie1, Jingwen Chen1, and Jonas Elm2 Rongjie Zhang et al.
  • 1Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
  • 2Department of Chemistry and iClimate, Aarhus University, Langelandsgade 140, DK-8000 Aarhus C, Denmark

Abstract. Atmospheric organic acids (OAs) are expected to enhance methanesulfonic acid (MSA)-driven new particle formation (NPF). However, the exact role of OAs in MSA-driven NPF remains unclear. Here, we employed a two-step strategy to probe the role of OAs in MSA-methylamine (MA) NPF. Initially, we evaluated the enhancing potential of 12 commonly detected OAs in ternary MA-MSA-OA cluster formation by considering the formation free energies of the (MSA)1(MA)1(OA)1 clusters and the atmospheric concentrations of the OAs. It was found that formic acid (ForA) has the highest potential to stabilize the MA-MSA clusters. The high enhancing potential of ForA results from its acidity, structural factors such as no intramolecular H-bonds and high atmospheric abundance. The second step is to extend the MSA-MA-ForA system to larger cluster sizes. The results indicate that ForA can indeed enhance MSA-MA NPF at atmospheric conditions (the upper limited temperature is 258.15 K), indicating that ForA might have an important role in MSA-driven NPF. The enhancing effect of ForA is mainly caused by an increased formation of the (MSA)2(MA)1 cluster, which is involved in the pathway of binary MSA-MA nucleation. Hence, our results indicate that OAs might be required to facilitate MSA-driven NPF in the atmosphere.

Rongjie Zhang et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-831', Anonymous Referee #1, 17 Nov 2021
  • RC2: 'Comment on acp-2021-831', Anonymous Referee #2, 18 Nov 2021

Rongjie Zhang et al.

Rongjie Zhang et al.

Viewed

Total article views: 511 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
386 118 7 511 28 7 5
  • HTML: 386
  • PDF: 118
  • XML: 7
  • Total: 511
  • Supplement: 28
  • BibTeX: 7
  • EndNote: 5
Views and downloads (calculated since 19 Oct 2021)
Cumulative views and downloads (calculated since 19 Oct 2021)

Viewed (geographical distribution)

Total article views: 486 (including HTML, PDF, and XML) Thereof 486 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 01 Dec 2021
Download
Short summary
The formic acid is screened out as the species that can effectively catalyze the new particle formation (NPF) of methanesulfonic acid (MSA)-methylamine system, indicating organic acids might be required to facilitate MSA-driven NPF in the atmosphere. The results are significant to comprehensively understand the MSA-driven NPF and expand current knowledge of the contribution of OAs on NPF.
Altmetrics