TY - JOUR
T1 - Light attenuation cross-section of black carbon in an urban atmosphere in northern China
AU - Cao, Junji
AU - Zhu, Chongshu
AU - Ho, Kinfai
AU - Han, Yongming
AU - Shen, Zhenxing
AU - Zhan, Changlin
AU - Zhang, Jiaquan
N1 - Publisher Copyright:
© 2014 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
PY - 2015/2/1
Y1 - 2015/2/1
N2 - Fine particulate matter (PM2.5) samples were collected over two years in Xi'an, China to investigate the relationships between the aerosol composition and the light absorption efficiency of black carbon (BC). Real-time light attenuation of BC at 880 nm was measured with an aethalometer. The mass concentrations and elemental carbon (EC) contents of PM2.5 were obtained, and light attenuation cross-sections (σATN) of PM2.5 BC were derived. The mass of EC contributed ∼5% to PM2.5 on average. BC σATN exhibited pronounced seasonal variability with values averaging 18.6, 24.2, 16.4, and 26.0 m2/g for the spring, summer, autumn, and winter, respectively, while averaging 23.0 m2/g overall. σATN varied inversely with the ratios of EC/PM2.5, EC/[SO42-], and EC/[NO3-]. This study of the variability in σATN illustrates the complexity of the interactions among the aerosol constituents in northern China and documents certain effects of the high EC, dust, sulfate and nitrate loadings on light attenuation.
AB - Fine particulate matter (PM2.5) samples were collected over two years in Xi'an, China to investigate the relationships between the aerosol composition and the light absorption efficiency of black carbon (BC). Real-time light attenuation of BC at 880 nm was measured with an aethalometer. The mass concentrations and elemental carbon (EC) contents of PM2.5 were obtained, and light attenuation cross-sections (σATN) of PM2.5 BC were derived. The mass of EC contributed ∼5% to PM2.5 on average. BC σATN exhibited pronounced seasonal variability with values averaging 18.6, 24.2, 16.4, and 26.0 m2/g for the spring, summer, autumn, and winter, respectively, while averaging 23.0 m2/g overall. σATN varied inversely with the ratios of EC/PM2.5, EC/[SO42-], and EC/[NO3-]. This study of the variability in σATN illustrates the complexity of the interactions among the aerosol constituents in northern China and documents certain effects of the high EC, dust, sulfate and nitrate loadings on light attenuation.
KW - Dust
KW - Elemental carbon
KW - Light attenuation cross-section
KW - Xi'an
UR - https://www.scopus.com/pages/publications/84922939252
U2 - 10.1016/j.partic.2014.04.011
DO - 10.1016/j.partic.2014.04.011
M3 - 文章
AN - SCOPUS:84922939252
SN - 1674-2001
VL - 18
SP - 89
EP - 95
JO - Particuology
JF - Particuology
ER -