Article Dans Une Revue Atmospheric Chemistry and Physics Année : 2025

Spectral optical properties of soot: laboratory investigation of propane flame particles and their link to composition

Vera Bernardoni
Roberta Vecchi
Virginia Vernocchi

Résumé

Soot aerosol generated from the incomplete combustion of biomass and fossil fuels is a major light-absorber; however its spectral optical properties for varying black carbon (BC) and brown carbon (BrC) content remain uncertain. In this study, soot aerosols with varying maturity and composition, i.e. elemental-to-total-carbon ratio (EC/TC), have been studied systematically in a large simulation chamber to determine their mass absorption, scattering, and extinction cross sections (MAC, MSC, MEC); single-scattering albedo (SSA); and absorption and scattering Ångström exponents (AAE, SAE). The MAC, MEC, SSA, and AAE show a variability between the different types of soot with varying EC/TC ratios. The MAC (MEC) at 550 nm increases for increasing EC/TC, with values of 1.0 (1.4) m2 g−1 for EC/TC = 0.0 (BrC-dominated soot) and 4.6 (5.1) m2 g−1 for EC/TC = 0.79 (BC-dominated soot). The AAE and SSA (550 nm) decrease from 3.79 and 0.29 (EC/TC = 0.0) to 1.27 and 0.10 (EC/TC = 0.79). Combining present results for soot from propane combustion with literature data for flame soot from diverse fuels supports a generalised exponential relationship between particle EC/TC and its MAC and AAE values (MAC550=(1.3±0.05) e(1.8±0.1)(EC/TC); AAE=(0.73±0.12)+(3.29±0.12) e-(2.32±0.30)(EC/TC), which represents the optical continuum of spectral absorption for soot with varying maturity. From this, it is possible to extrapolate a MAC of 7.9 and 1.3 m2 g−1 (550 nm) and an AAE (375–870 nm) of 1.05 and 4.02 for pure EC (BC-like) and pure OC (BrC-like) soot. The established relationship can provide a useful parameterisation for models to estimate the absorption from combustion aerosols and their BC and BrC contributions.

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Cite 10.25326/8KVR-AA70 Jeu de données Heuser, J., Di Biagio, C., Cazaunau, M., Berge, A., Pangui, E., Yon, J., Zanatta, M., Renzi, L., Marinoni, A., Laj, P., Temime-Roussel, B., Formenti, P., Picquet-Varrault, B., & Doussin, J.-F. (2025). Atmospheric simulation chamber study: Soot + None - Aerosol study - optical properties - 2021-02-23 (Version 1.1) [Data set]. AERIS. https://doi.org/10.25326/8KVR-AA70

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Cite 10.25326/76FN-TA55 Jeu de données Heuser, J., Di Biagio, C., Cazaunau, M., Berge, A., Pangui, E., Yon, J., Zanatta, M., Renzi, L., Marinoni, A., Laj, P., Temime-Roussel, B., Formenti, P., Picquet-Varrault, B., & Doussin, J.-F. (2025). Atmospheric simulation chamber study: Soot + sulfuric acid + None - Aerosol study - optical properties - 2021-03-03 (Version 1.1) [Data set]. AERIS. https://doi.org/10.25326/76FN-TA55

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Cite 10.25326/PWHP-ED62 Jeu de données Heuser, J., Di Biagio, C., Cazaunau, M., Berge, A., Pangui, E., Yon, J., Zanatta, M., Renzi, L., Marinoni, A., Laj, P., Temime-Roussel, B., Formenti, P., Picquet-Varrault, B., & Doussin, J.-F. (2025). Atmospheric simulation chamber study: Soot + sulfuric acid + O3 - Aerosol study - optical properties - 2021-03-04 (Version 1.1) [Data set]. AERIS. https://doi.org/10.25326/PWHP-ED62

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Cite 10.25326/A18P-JF85 Jeu de données Heuser, J., Di Biagio, C., Cazaunau, M., Berge, A., Pangui, E., Yon, J., Zanatta, M., Renzi, L., Marinoni, A., Laj, P., Temime-Roussel, B., Formenti, P., Picquet-Varrault, B., & Doussin, J.-F. (2025). Atmospheric simulation chamber study: Soot + sulfuric acid + O3 - Aerosol study - optical properties - 2021-03-09 (Version 1.3) [Data set]. AERIS. https://doi.org/10.25326/A18P-JF85

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Cite 10.25326/AK6B-ZA08 Jeu de données Heuser, J., Di Biagio, C., Cazaunau, M., Berge, A., Pangui, E., Yon, J., Zanatta, M., Renzi, L., Marinoni, A., Laj, P., Formenti, P., Picquet-Varrault, B., & Doussin, J.-F. (2025). Atmospheric simulation chamber study: Soot + alpha-pinene + O3 - Aerosol study - optical properties - 2021-05-18 (Version 1.1) [Data set]. AERIS. https://doi.org/10.25326/AK6B-ZA08

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Cite 10.25326/BGRM-3554 Jeu de données Heuser, J., Di Biagio, C., Cazaunau, M., Berge, A., Pangui, E., Yon, J., Zanatta, M., Renzi, L., Marinoni, A., Laj, P., Formenti, P., Picquet-Varrault, B., & Doussin, J.-F. (2025). Atmospheric simulation chamber study: Soot + alpha-pinene + O3 - Aerosol study - optical properties - 2021-05-26 (Version 1.1) [Data set]. AERIS. https://doi.org/10.25326/BGRM-3554

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Cite 10.25326/3EGX-K414 Jeu de données Heuser, J., Di Biagio, C., Cazaunau, M., Berge, A., Pangui, E., Yon, J., Zanatta, M., Renzi, L., Marinoni, A., Laj, P., Temime-Roussel, B., Formenti, P., Picquet-Varrault, B., & Doussin, J.-F. (2025). Atmospheric simulation chamber study: Soot + None - Aerosol study - optical properties - 2021-03-11 (Version 1.1) [Data set]. AERIS. https://doi.org/10.25326/3EGX-K414

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Cite 10.25326/7HWB-GT84 Jeu de données Heuser, J., Di Biagio, C., Cazaunau, M., Berge, A., Pangui, E., Yon, J., Zanatta, M., Renzi, L., Marinoni, A., Laj, P., Temime-Roussel, B., Formenti, P., Picquet-Varrault, B., & Doussin, J.-F. (2025). Atmospheric simulation chamber study: Soot + None - Aerosol study - optical properties - 2021-03-11 (Version 1.1) [Data set]. AERIS. https://doi.org/10.25326/7HWB-GT84

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Cite 10.25326/0HMW-HM76 Jeu de données Heuser, J., Di Biagio, C., Cazaunau, M., Berge, A., Pangui, E., Formenti, P., Picquet-Varrault, B., & Doussin, J.-F. (2025). Atmospheric simulation chamber study: Soot + None - Aerosol study - optical properties - 2021-10-26 (Version 1.1) [Data set]. AERIS. https://doi.org/10.25326/0HMW-HM76

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Cite 10.25326/XPP8-2J07 Jeu de données Heuser, J., Di Biagio, C., Cazaunau, M., Berge, A., Pangui, E., Yon, J., Zanatta, M., Renzi, L., Marinoni, A., Laj, P., Temime-Roussel, B., Formenti, P., Picquet-Varrault, B., & Doussin, J.-F. (2025). Atmospheric simulation chamber study: Soot + None - Aerosol study - optical properties - 2021-03-12 (Version 1.1) [Data set]. AERIS. https://doi.org/10.25326/XPP8-2J07

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Cite 10.25326/VPM3-3W86 Jeu de données Heuser, J., Di Biagio, C., Cazaunau, M., Berge, A., Pangui, E., Formenti, P., Picquet-Varrault, B., & Doussin, J.-F. (2025). Atmospheric simulation chamber study: Soot + None - Aerosol study - optical properties - 2021-10-22 (Version 1.1) [Data set]. AERIS. https://doi.org/10.25326/VPM3-3W86

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Cite 10.25326/BGCT-4J45 Jeu de données Heuser, J., Di Biagio, C., Cazaunau, M., Berge, A., Pangui, E., Yon, J., Zanatta, M., Renzi, L., Marinoni, A., Laj, P., Formenti, P., Picquet-Varrault, B., & Doussin, J.-F. (2025). Atmospheric simulation chamber study: Soot + None - Aerosol study - optical properties - 2021-05-28 (Version 1.1) [Data set]. AERIS. https://doi.org/10.25326/BGCT-4J45

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Cite 10.25326/34DX-YJ98 Jeu de données Heuser, J., Di Biagio, C., Cazaunau, M., Berge, A., Pangui, E., Formenti, P., Picquet-Varrault, B., & Doussin, J.-F. (2025). Atmospheric simulation chamber study: Soot + None - Aerosol study - optical properties - 2021-10-21 (Version 1.1) [Data set]. AERIS. https://doi.org/10.25326/34DX-YJ98

Dates et versions

hal-05402264 , version 1 (07-12-2025)

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Johannes Heuser, Claudia Di Biagio, Jérôme Yon, Mathieu Cazaunau, Antonin Bergé, et al.. Spectral optical properties of soot: laboratory investigation of propane flame particles and their link to composition. Atmospheric Chemistry and Physics, 2025, 25 (12), pp.6407-6428. ⟨10.5194/acp-25-6407-2025⟩. ⟨hal-05402264⟩
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