Optical properties of coated black carbon aggregates: numerical simulations, radiative forcing estimates, and size-resolved parameterization scheme

Romshoo, Baseerat; Müller, Thomas; Pfeifer, Sascha; Saturno, Jorge; Nowak, Andreas; Ciupek, Krzysztof; Quincey, Paul; Wiedensohler, Alfred

doi:https://doi.org/10.5194/acp-21-12989-2021

Articles | Volume 21, issue 17

https://doi.org/10.5194/acp-21-12989-2021

© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-21-12989-2021

© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 21, issue 17

Research article

|

02 Sep 2021

Research article |

| 02 Sep 2021

Optical properties of coated black carbon aggregates: numerical simulations, radiative forcing estimates, and size-resolved parameterization scheme

Baseerat Romshoo, Thomas Müller, Sascha Pfeifer, Jorge Saturno, Andreas Nowak, Krzysztof Ciupek, Paul Quincey, and Alfred Wiedensohler

Supplement

https://doi.org/10.5194/acp-21-12989-2021-supplement

Model code and software

Tunable Diffusion Limited Aggregation software DLA ver. 1.13.02 M. Woźniak and F. Onofri https://sites.google.com/view/fabriceonofri/aggregates/fractal-like-aggregates-diffusion-model

A multiple sphere T-matrix FORTRAN code for use on parallel computer clusters, Version 3.0 D. W. Mackowski https://eng.auburn.edu/users/dmckwski/scatcodes/

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Short summary

Modifications in the optical properties of black carbon (BC) due to ageing are presented and quantified in this study using a state-of-the-art description scheme of BC fractal aggregates. It is shown that the relative change in BC radiative forcing can be larger than 50 % as a function of changing fractal dimension and organic content. A comprehensive parameterization scheme for coated BC optical properties is developed with applications for modelling, ambient, and laboratory-based BC studies.