Enhanced light absorption due to the mixing state of black carbon in fresh biomass burning emissions
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Research
Enhanced light absorption due to the mixing state of black carbon in fresh biomass burning emissions
Professor Dr. Siwatt Pongpiachan (School of Social and Environmental Development, National Institute of Development Administration), Qiyuan Wanga, Junji Caoa, Yongming Hana, Jie Tian, Yue Zhang, Yonggang Zhang, Li Li, Xinyi Niu, Zhenxing Shen, Zhuzi Zhao, Danai Tipmanee, Suratta Bunsomboonsakul, Yang Chen, Jian Sund
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.
อ่านเพิ่มเติมได้ที่ : Enhanced light absorption due to the mixing state of black carbon in fresh biomass burning emissions
