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Atmosphere 2015, 6(2), 195-208; doi:10.3390/atmos6020195

Characteristics of Black Carbon Aerosol during the Chinese Lunar Year and Weekdays in Xi’an, China

1
Key Laboratory of Aerosol Chemistry & Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China
2
Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an 710049, China
3
Lab of Atmospheric Chemistry, Paul Scherrer Institute (PSI), Villigen 5232, Switzland
4
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
Received: 1 December 2014 / Revised: 9 January 2015 / Accepted: 27 January 2015 / Published: 5 February 2015
(This article belongs to the Special Issue Sources, Formation and Impacts of Secondary Aerosol)
View Full-Text   |   Download PDF [2127 KB, uploaded 5 February 2015]   |  

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
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Wang, Q.; Liu, S.; Zhou, Y.; Cao, J.; Han, Y.; Ni, H.; Zhang, N.; Huang, R. Characteristics of Black Carbon Aerosol during the Chinese Lunar Year and Weekdays in Xi’an, China. Atmosphere 2015, 6, 195-208.

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