Preprints
https://doi.org/10.5194/egusphere-2024-3940
https://doi.org/10.5194/egusphere-2024-3940
20 Dec 2024
 | 20 Dec 2024

Retention During Freezing of Raindrops, Part II: Investigation of Ambient Organics from Beijing Urban Aerosol Samples

Jackson Seymore, Martanda Gautam, Miklós Szakáll, Alexander Theis, Thorsten Hoffmann, Jialiang Ma, Lingli Zhou, and Alexander Vogel

Abstract. The freezing of hydrometeors incurs certain water-soluble organic compounds dissolved in the supercooled cloud droplets to be released into the gas phase. This may lead to the vertical redistribution of substances that become available for new particle formation in the upper troposphere. Drop freezing experiments were performed on the Mainz Acoustic Levitator (M-AL) using aqueous extracts of ambient samples of Beijing urban aerosol. The retention coefficients of over 450 compounds were determined. Most nitroaromatics and organosulfates were fully retained along with the aliphatic amines (AA) and higher-order amines and amides while sulfides, lipids, aromatic hydrocarbons, and long chain compounds are among the most unretained and incidentally the fewest species observed. The findings here also indicate that NOx and SOx chemistry, particularly anthropogenically related, enhances the retention of the resulting secondary organic aerosols (SOA). A positive correlation between polarity and freezing retention along with a negative correlation with vapor pressure and freezing retention was observed. No sigmoidal relationship with effective Henry’s law constant was observed which differs with the parameterizations of riming retention presented in current literature, which is justified by the lower surface-to-volume ratio of the large drop size investigated.

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Journal article(s) based on this preprint

01 Oct 2025
Retention during freezing of raindrops – Part 2: Investigation of ambient organics from Beijing urban aerosol samples
Jackson Seymore, Martanda Gautam, Miklós Szakáll, Alexander Theis, Thorsten Hoffmann, Jialiang Ma, Lingli Zhou, and Alexander L. Vogel
Atmos. Chem. Phys., 25, 11829–11845, https://doi.org/10.5194/acp-25-11829-2025,https://doi.org/10.5194/acp-25-11829-2025, 2025
Short summary
Jackson Seymore, Martanda Gautam, Miklós Szakáll, Alexander Theis, Thorsten Hoffmann, Jialiang Ma, Lingli Zhou, and Alexander Vogel

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-3940', Anonymous Referee #1, 16 Jan 2025
  • RC2: 'Comment on egusphere-2024-3940', Anonymous Referee #2, 01 Mar 2025
  • RC3: 'Comment on egusphere-2024-3940', • Amy L. Stuart, 31 Mar 2025
  • AC1: 'Comment on egusphere-2024-3940', Jackson Seymore, 07 Apr 2025

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-3940', Anonymous Referee #1, 16 Jan 2025
  • RC2: 'Comment on egusphere-2024-3940', Anonymous Referee #2, 01 Mar 2025
  • RC3: 'Comment on egusphere-2024-3940', • Amy L. Stuart, 31 Mar 2025
  • AC1: 'Comment on egusphere-2024-3940', Jackson Seymore, 07 Apr 2025

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
AR by Jackson Seymore on behalf of the Authors (07 Apr 2025)  Author's response   Author's tracked changes   Manuscript 
ED: Referee Nomination & Report Request started (08 Apr 2025) by Barbara Ervens
RR by Anonymous Referee #2 (12 Apr 2025)
RR by Anonymous Referee #1 (20 Apr 2025)
ED: Publish subject to minor revisions (review by editor) (07 May 2025) by Barbara Ervens
AR by Jackson Seymore on behalf of the Authors (15 May 2025)  Author's response   Author's tracked changes   Manuscript 
ED: Publish as is (16 May 2025) by Barbara Ervens
AR by Jackson Seymore on behalf of the Authors (23 May 2025)  Author's response   Manuscript 

Journal article(s) based on this preprint

01 Oct 2025
Retention during freezing of raindrops – Part 2: Investigation of ambient organics from Beijing urban aerosol samples
Jackson Seymore, Martanda Gautam, Miklós Szakáll, Alexander Theis, Thorsten Hoffmann, Jialiang Ma, Lingli Zhou, and Alexander L. Vogel
Atmos. Chem. Phys., 25, 11829–11845, https://doi.org/10.5194/acp-25-11829-2025,https://doi.org/10.5194/acp-25-11829-2025, 2025
Short summary
Jackson Seymore, Martanda Gautam, Miklós Szakáll, Alexander Theis, Thorsten Hoffmann, Jialiang Ma, Lingli Zhou, and Alexander Vogel
Jackson Seymore, Martanda Gautam, Miklós Szakáll, Alexander Theis, Thorsten Hoffmann, Jialiang Ma, Lingli Zhou, and Alexander Vogel

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Short summary
We investigated the chemical retention of water-soluble organic compounds in Beijing aerosols using an acoustic levitator and drop freezing experiments. Samples from PM2.5 filter extracts were frozen at -15 °C without artificial nucleators and analyzed using ultra-high resolution mass spectrometry. Our findings reveal a nonnormal distribution of retention coefficients that differs from current literature on cloud droplets.
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