Preprints
https://doi.org/10.5194/acp-2021-336
https://doi.org/10.5194/acp-2021-336

  21 Apr 2021

21 Apr 2021

Review status: a revised version of this preprint is currently under review for the journal ACP.

Method to Quantify the Black Carbon Aerosol Light Absorption Enhancement with Entropy and Diversity Measures

Gang Zhao1, Tianyi Tan1, Yishu Zhu1, Min Hu1, and Chunsheng Zhao2 Gang Zhao et al.
  • 1State Key Joint Laboratory of Environmental Simulation and Pollution Control, International Joint Laboratory for Regional Pollution Control, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China
  • 2Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing, 100871, China

Abstract. Large uncertainties remain when estimating the warming effects of ambient black carbon (BC) aerosols on climate. One of the key challenges in modeling the radiative effects is predicting the BC light absorption enhancement, which is mainly determined by its mass ratio of non-BC coating thickness to BC (MR). For the same MR, recent researches find that the radiative absorption enhancements by BC are also controlled by its particle-to-particle heterogeneity. In this study, the BC mixing state index (χ) is developed to quantify the dispersion of ambient black carbon aerosol mixing states based on binary systems of BC and other non-black carbon components. We demonstrate that the BC light absorption enhancement increases with χ for the same MR, which indicates that χ can be employed as a factor to constrain the light absorption enhancement of ambient BC. Our framework can be further used in the model to study the black carbon radiative effects on climate change.

Gang Zhao et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on acp-2021-336', James Allan, 26 Apr 2021
    • AC3: 'Reply on CC1', Chunsheng Zhao, 21 Jul 2021
  • RC1: 'Comment on acp-2021-336', Anonymous Referee #1, 23 May 2021
    • AC1: 'Reply on RC1', Chunsheng Zhao, 21 Jul 2021
  • RC2: 'Comment on acp-2021-336', Anonymous Referee #2, 09 Jul 2021
    • AC2: 'Reply on RC2', Chunsheng Zhao, 21 Jul 2021

Gang Zhao et al.

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Short summary
In this study, the black carbon (BC) mixing state index (χ) is developed to quantify the dispersion of ambient black carbon aerosol mixing states based on binary systems of BC and other non-black carbon components. We demonstrate that the BC light absorption enhancement increases with χ for the same MR, which indicates that χ can be employed as a factor to constrain the light absorption enhancement of ambient BC.
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