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

Jiang, Feng ORCID iD icon 1; Siemens, Kyla; Linke, Claudia 1; Li, Yanxia 1; Gong, Yiwei 1; Leisner, Thomas ORCID iD icon 1; Laskin, A.; Saathoff, Harald ORCID iD icon 1
1 Institut für Meteorologie und Klimaforschung Atmosphärische Aerosolforschung (IMKAAF), Karlsruher Institut für Technologie (KIT)

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. ... mehr


Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung Atmosphärische Aerosolforschung (IMKAAF)
Publikationstyp Forschungsdaten
Publikationsdatum 30.01.2024
Erstellungsdatum 02.01.2024 - 25.01.2024
Identifikator DOI: 10.35097/1904
KITopen-ID: 1000167745
HGF-Programm 12.11.12 (POF IV, LK 01) Atmospheric chemistry processes
Lizenz Creative Commons Namensnennung – Nicht kommerziell – Keine Bearbeitungen 4.0 International
Vorab online veröffentlicht am 26.01.2024
Externe Relationen Abstract/Volltext
Schlagwörter Secondary aerosol, brown carbon, Indole
Liesmich

This data is related to the publication "Molecular Analysis of Secondary Organic Aerosol and Brown Carbon from the Oxidation of Indole" by Jiang et al., 2024 in Atmospheric Chemistry and Physics.

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