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Comment on "Could We Achieve the On‐Line Measurements of the Optical Fractal Dimensions of Black Carbon?" by G. Zhao, M. Hu, W. Lin, Y. Kuang, J. Sun,L. Zeng, and C. Zhao.

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Titel: Comment on "Could We Achieve the On‐Line Measurements of the Optical Fractal Dimensions of Black Carbon?" by G. Zhao, M. Hu, W. Lin, Y. Kuang, J. Sun,L. Zeng, and C. Zhao.
Autoren: Sorensen, Christopher M., Maughan, Justin B., Ehlers, Kurt, Ebini, Raiya H., Gautam, Prakash, Moosmüller, Hans
Quelle: Geophysical Research Letters; 6/16/2025, Vol. 52 Issue 11, p1-4, 4p
Schlagwörter: FRACTAL dimensions, OPTICAL measurements, CARBON-black, LIGHT scattering, RADIATIVE forcing
Abstract: Zhao et al. (2025, https://doi.org/10.1029/2024GL112332) state the need for measuring the fractal dimension of black carbon aggregates online and proceed to propose and demonstrate a novel method to derive this fractal dimension from measured mobility parameters and mass concentrations. Their summary of the previous state‐of‐the‐art is that the fractal dimension could not be measured online. Here, we briefly review the literature on the current state‐of‐the‐art for light scattering experiments and clearly establish that optical laboratory measurements of aggregate fractal dimension and size have been performed. Furthermore, we agree with Zhao et al. (2025, https://doi.org/10.1029/2024GL112332) on the importance of developing and utilizing online instruments for such measurements and argue that optical scattering measurements can do so at low cost. Plain Language Summary: Some ambient aerosols, such as black carbon agglomerates have complex and evolving fractal‐like structures that greatly affect their radiative forcing and influence on climate change. Therefore, there is a need for online monitoring of their structure as pointed out by Zhao et al. (2025, https://doi.org/10.1029/2024GL112332), who have also proposed and demonstrated a method for this, arguing the novelty of their method. Here, we demonstrate that existing optical light‐scattering experiments have already made such measurements and are well suited for the development of low‐cost optical online monitors. Key Points: Optical scattering measurements of the fractal dimension and size of black carbon have been demonstratedSuch optical measurements could be used to develop a low‐cost online instrument [ABSTRACT FROM AUTHOR]
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Datenbank: Complementary Index
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Abstract:Zhao et al. (2025, https://doi.org/10.1029/2024GL112332) state the need for measuring the fractal dimension of black carbon aggregates online and proceed to propose and demonstrate a novel method to derive this fractal dimension from measured mobility parameters and mass concentrations. Their summary of the previous state‐of‐the‐art is that the fractal dimension could not be measured online. Here, we briefly review the literature on the current state‐of‐the‐art for light scattering experiments and clearly establish that optical laboratory measurements of aggregate fractal dimension and size have been performed. Furthermore, we agree with Zhao et al. (2025, https://doi.org/10.1029/2024GL112332) on the importance of developing and utilizing online instruments for such measurements and argue that optical scattering measurements can do so at low cost. Plain Language Summary: Some ambient aerosols, such as black carbon agglomerates have complex and evolving fractal‐like structures that greatly affect their radiative forcing and influence on climate change. Therefore, there is a need for online monitoring of their structure as pointed out by Zhao et al. (2025, https://doi.org/10.1029/2024GL112332), who have also proposed and demonstrated a method for this, arguing the novelty of their method. Here, we demonstrate that existing optical light‐scattering experiments have already made such measurements and are well suited for the development of low‐cost optical online monitors. Key Points: Optical scattering measurements of the fractal dimension and size of black carbon have been demonstratedSuch optical measurements could be used to develop a low‐cost online instrument [ABSTRACT FROM AUTHOR]
ISSN:00948276
DOI:10.1029/2025GL116124