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Impact of Organic Coating on Soot Angular and Spectral Scattering Properties
Guillaume Lefevre1, Jérôme Yon1, Maxime Bouvier1
1Normandie University , INSA Rouen, UNIROUEN, CNRS, CORIA , 76000 Rouen , France.
Environmental Science & Technology
|May 7, 2019
Summary
Coating soot particles with organic compounds alters their radiative properties, impacting climate models. This study experimentally mimics atmospheric aging to understand these changes.
Area of Science:
- Atmospheric Chemistry and Physics
- Radiative Transfer
- Aerosol Science
Background:
- Soot particles significantly influence global warming and atmospheric processes.
- Understanding how soot's radiative properties change with atmospheric aging is crucial.
- Coating by non-absorbing organic aerosols is a key aging mechanism.
Purpose of the Study:
- To experimentally investigate the effect of organic coating on soot radiative properties.
- To validate theoretical models for coated soot aggregates.
- To provide data for climate modeling and scattering-based measurements.
Main Methods:
- Laboratory experiment mimicking atmospheric aging by coating fresh soot with oleic acid.
- Morphological characterization using non-optical techniques (mobility diameter, effective density) and angular light scattering (gyration radius, fractal dimension).
- Spectrally resolved scattering measurements (500-700 nm).
Main Results:
- Non-optical and light scattering methods showed consistent results for morphological restructuring.
- Experimental scattering data agreed well with previous numerical simulations.
- The study enabled validation of the Rayleigh-Debye-Gans theory for coated fractal aggregates (RDG-CFA).
Conclusions:
- Organic coating significantly affects the morphological and radiative properties of soot particles.
- The validated RDG-CFA model can be integrated into climate models.
- Findings enhance the interpretation of scattering-based measurements for atmospheric aerosols.
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