Aerosol Research
Aerosol Research
Aerosol Research
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https://doi.org/10.5194/ar-2024-26
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ar-2024-26
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
Preprints
08 Oct 2024
 | 08 Oct 2024
Status: this preprint is currently under review for the journal AR.

Validation of cantilever-enhanced photoacoustic particle size-resolved light absorption measurement using nigrosin reference particles and Mie-modelling

Joel Kuula, Juho Karhu, Tommi Mikkonen, Patrick Grahn, Aki Virkkula, Hilkka Timonen, Tuomas Hieta, and Markku Vainio

Abstract. Particle light absorption enhancement, also known as the lensing effect, is a complex phenomenon where particles undergo optical transformation as they age. This process is influenced by several factors, including particle size. To investigate the lensing effect, this study introduces a novel method and technique for measuring size-resolved light absorption of particles. The key instrument in this method is a 3-wavelength Cantilever-Enhanced Photoacoustic Spectrometer, which is a fast and sensitive tool that measures absorption directly in the aerosol phase. By coupling the CEPAS with a conventional Differential Mobility Analyzer, particle-size resolved measurements are achieved. Evaluation of the developed system showed a strong correlation (R2 > 0.97) with Mie-modelled light absorption of nigrosin reference particles, paving the way for intriguing new opportunities in future studies.

How to cite. Kuula, J., Karhu, J., Mikkonen, T., Grahn, P., Virkkula, A., Timonen, H., Hieta, T., and Vainio, M.: Validation of cantilever-enhanced photoacoustic particle size-resolved light absorption measurement using nigrosin reference particles and Mie-modelling, Aerosol Research Discuss. [preprint], https://doi.org/10.5194/ar-2024-26, in review, 2024.
Received: 24 Sep 2024 – Discussion started: 08 Oct 2024
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Joel Kuula, Juho Karhu, Tommi Mikkonen, Patrick Grahn, Aki Virkkula, Hilkka Timonen, Tuomas Hieta, and Markku Vainio

Status: open (until 19 Nov 2024)

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Joel Kuula, Juho Karhu, Tommi Mikkonen, Patrick Grahn, Aki Virkkula, Hilkka Timonen, Tuomas Hieta, and Markku Vainio
Joel Kuula, Juho Karhu, Tommi Mikkonen, Patrick Grahn, Aki Virkkula, Hilkka Timonen, Tuomas Hieta, and Markku Vainio

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Short summary
We developed a new method to measure how particles absorb light as they change in size, which is critical for understanding their climate impact. Our approach uses a sensitive instrument that measures light absorption directly from particles in real time. By pairing this with a device that sorts particles by size, we achieved accurate, size-resolved measurements. Our findings closely match theoretical models, offering a promising tool for future research into how particles influence climate.
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