Preprints
https://doi.org/10.5194/egusphere-2023-1804
https://doi.org/10.5194/egusphere-2023-1804
25 Aug 2023
 | 25 Aug 2023

Molecular Analysis of Secondary Organic Aerosol and Brown Carbon from the Oxidation of Indole

Feng Jiang, Kyla Siemens, Claudia Linke, Yanxia Li, Yiwei Gong, Thomas Leisner, Alexander Laskin, and Harald Saathoff

Abstract. Indole (ind) is a nitrogen-containing heterocyclic volatile organic compound commonly emitted from animal husbandry and from different plants like maize with global emissions of 0.1 Tg y-1. The chemical composition and optical properties of indole secondary organic aerosol (SOA) and brown carbon (BrC) are still not well understood. To address this, environmental chamber experiments were conducted to investigate the oxidation of indole at atmospherically relevant concentrations of selected oxidants (OH radicals and O3) with/without NO2. In the presence of NO2, the SOA yields decreased by more than a factor of two but the mass absorption coefficient at 365 nm (MAC365) of ind-SOA was 4.3 ± 0.4 m2 g-1, which was 5 times higher than that in experiments without NO2. In the presence of NO2, C8H6N2O2 (identified as 3-nitroindole) contributed 76 % to the all organic compounds detected by a chemical ionization mass spectrometer, contributing ~50 % of the light absorption at 365 nm (Abs365). In the absence of NO2, the dominating chromophore was C8H7O3N contributing to 20–30 % of Abs365. Indole contributes substantially to the formation of secondary BrC and its potential impact on the atmospheric radiative transfer is further enhanced in the presence of NO2, as it significantly increases the specific light absorption of ind-SOA by facilitating the formation of 3-nitroindole. This work provides new insights into an important process of brown carbon formation by interaction of two pollutants, NO2 and indole, mainly emitted by anthropogenic activities.

Journal article(s) based on this preprint

29 Feb 2024
Molecular analysis of secondary organic aerosol and brown carbon from the oxidation of indole
Feng Jiang, Kyla Siemens, Claudia Linke, Yanxia Li, Yiwei Gong, Thomas Leisner, Alexander Laskin, and Harald Saathoff
Atmos. Chem. Phys., 24, 2639–2649, https://doi.org/10.5194/acp-24-2639-2024,https://doi.org/10.5194/acp-24-2639-2024, 2024
Short summary
Feng Jiang, Kyla Siemens, Claudia Linke, Yanxia Li, Yiwei Gong, Thomas Leisner, Alexander Laskin, and Harald Saathoff

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-1804', Anonymous Referee #1, 19 Sep 2023
  • RC2: 'Comment on egusphere-2023-1804', Anonymous Referee #2, 07 Oct 2023

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-1804', Anonymous Referee #1, 19 Sep 2023
  • RC2: 'Comment on egusphere-2023-1804', Anonymous Referee #2, 07 Oct 2023

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
AR by Feng Jiang on behalf of the Authors (01 Dec 2023)  Author's response   Author's tracked changes   Manuscript 
ED: Referee Nomination & Report Request started (05 Dec 2023) by Theodora Nah
RR by Anonymous Referee #3 (20 Dec 2023)
RR by Anonymous Referee #1 (30 Dec 2023)
ED: Publish subject to minor revisions (review by editor) (30 Dec 2023) by Theodora Nah
AR by Feng Jiang on behalf of the Authors (09 Jan 2024)  Author's response   Author's tracked changes   Manuscript 
ED: Publish as is (13 Jan 2024) by Theodora Nah
AR by Feng Jiang on behalf of the Authors (17 Jan 2024)  Manuscript 

Post-review adjustments

AA: Author's adjustment | EA: Editor approval
AA by Feng Jiang on behalf of the Authors (27 Feb 2024)   Author's adjustment   Manuscript
EA: Adjustments approved (27 Feb 2024) by Theodora Nah

Journal article(s) based on this preprint

29 Feb 2024
Molecular analysis of secondary organic aerosol and brown carbon from the oxidation of indole
Feng Jiang, Kyla Siemens, Claudia Linke, Yanxia Li, Yiwei Gong, Thomas Leisner, Alexander Laskin, and Harald Saathoff
Atmos. Chem. Phys., 24, 2639–2649, https://doi.org/10.5194/acp-24-2639-2024,https://doi.org/10.5194/acp-24-2639-2024, 2024
Short summary
Feng Jiang, Kyla Siemens, Claudia Linke, Yanxia Li, Yiwei Gong, Thomas Leisner, Alexander Laskin, and Harald Saathoff
Feng Jiang, Kyla Siemens, Claudia Linke, Yanxia Li, Yiwei Gong, Thomas Leisner, Alexander Laskin, and Harald Saathoff

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Short summary
We investigated the optical properties, chemical composition, and formation mechanisms of secondary organic aerosol (SOA) and brown carbon (BrC) from the oxidation of indole with/without NO2 in the Aerosol Interaction and Dynamics in the Atmosphere (AIDA) simulation chamber. This work is one of the very few to link the optical properties and chemical composition of indole SOA with/without NO2 by simulation chamber experiments.