Char dominates black carbon aerosol emission and its historic reduction in China

Junjie Cai, Hongxing Jiang, Yingjun Chen (), Zeyu Liu, Yong Han, Huizhong Shen, Jianzhong Song, Jun Li, Yanlin Zhang, Rong Wang, Jianmin Chen and Gan Zhang ()
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Junjie Cai: Fudan University
Hongxing Jiang: Fudan University
Yingjun Chen: Fudan University
Zeyu Liu: Fudan University
Yong Han: Fudan University
Huizhong Shen: Southern University of Science and Technology
Jianzhong Song: Chinese Academy of Sciences
Jun Li: Chinese Academy of Sciences
Yanlin Zhang: Nanjing University of Information Science and Technology
Rong Wang: Fudan University
Jianmin Chen: Fudan University
Gan Zhang: Chinese Academy of Sciences

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract Emission factors and inventories of black carbon (BC) aerosols are crucial for estimating their adverse atmospheric effect. However, it is imperative to separate BC emissions into char and soot subgroups due to their significantly different physicochemical properties and potential effects. Here, we present a substantial dataset of char and soot emission factors derived from field and laboratory measurements. Based on the latest results of the char-to-soot ratio, we further reconstructed the emission inventories of char and soot for the years 1960–2017 in China. Our findings indicate that char dominates annual BC emissions and its huge historical reduction, which can be attributable to the rapid changes in energy structure, combustion technology and emission standards in recent decades. Our results suggest that further BC emission reductions in both China and the world should focus on char, which mainly derives from lower-temperature combustion and is easier to decrease compared to soot.

Date: 2023
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DOI: 10.1038/s41467-023-42192-8

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