Enhanced light absorption due to the mixing state of black carbon in fresh biomass burning emissions

Authors

Mr.Xinyi Niu, ดร.ศิวัช พงษ์เพียจันทร์, Mr.Qiyuan Wang, Mr.Junji Cao, Mr.Yongming Han, Mr.Jie Tian, Mr.Yonggang Zhang, Mr.Li Li, Mr.Zhenxing Shen, Mrs.Zhuzi Zhao, ดร.ดนัย ทิพย์มณี, น.ส.สุรัตตา บุญสมบูรณ์สกุล, Mr.Yang Chen, Mr.Jian Sun, Mr.Yue Zhang

Published

Atmospheric Environment

Abstract

A lack of information on the radiative effects of refractory black carbon (rBC) emitted from biomass burning is a significant gap in our understanding of climate change. A custom-made combustion chamber was used to simulate the open burning of crop residues and investigate the impacts of rBC size and mixing state on the particles’ optical properties. Average rBC mass median diameters ranged from 141 to 162 nm for the rBC produced from different types of crop residues. The number fraction of thickly-coated rBC varied from 53 to 64%, suggesting that a majority of the freshly emitted rBC were internally mixed. By comparing the result of observed mass absorption cross-section to that calculated with Mie theory, large light absorption enhancement factors (1.7–1.9) were found for coated particles relative to uncoated cores. These effects were strongly positively correlated with the percentage of coated particles but independent of rBC core size. We suggest that rBC from open biomass burning may have strong impact on air pollution and radiative forcing immediately after their production.

(2561). Enhanced light absorption due to the mixing state of black carbon in fresh biomass burning emissions. Atmospheric Environment , 2018(180), 184-191.