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1

Key Laboratory of Aerosol Chemistry & Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xian 710061, China

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Institute of Global Environmental Change, Xian Jiaotong University, Xian 710049, China

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Lab of Atmospheric Chemistry, Paul Scherrer Institute PSI, Villigen 5232, Switzland

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Centre for Climate and Air Pollution Studies, Ryan Institute, National University of Ireland Galway, University Road, Galway, Ireland





*

Author to whom correspondence should be addressed.



Academic Editor: Robert W. Talbot

Abstract Black carbon BC aerosol plays an important role in climate forcing. The net radiative effect is strongly dependent on the physical properties of BC particles. A single particle soot photometer and a carbon monoxide analyser were deployed during the Chinese Lunar Year CLY and on weekdays at Xi’an, China, to investigate the characteristics of refractory black carbon aerosol rBC. The rBC mass on weekdays 8.4 μg·m−3 exceeds that during the CLY 1.9 μg·m−3, presumably due to the lower anthropogenic emissions during the latter. The mass size distribution of rBC shows a primary mode peak at ~205 nm and a small secondary mode peak at ~102-nm volume-equivalent diameter assuming 2 g·cm−3 in void-free density in both sets of samples. More than half of the rBC cores are thickly coated during the CLY fBC = 57.5%; the percentage is slightly lower fBC = 48.3% on weekdays. Diurnal patterns in rBC mass and mixing state differ for the two sampling periods, which are attributed to the distinct anthropogenic activities. The rBC mass and CO mixing ratios are strongly correlated with slopes of 0.0070 and 0.0016 μg·m−3·ppbv−1 for weekdays and the CLY, respectively. View Full-Text

Keywords: refractory black carbon; size distribution; mixing state; carbon monoxide refractory black carbon; size distribution; mixing state; carbon monoxide





Autor: Qiyuan Wang 1, Suixin Liu 1, Yaqing Zhou 1, Junji Cao 1,2,* , Yongming Han 1, Haiyan Ni 1, Ningning Zhang 1 and Rujin Huang 1,3,4

Fuente: http://mdpi.com/



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