Characteristics of Black Carbon Aerosol during the Chinese Lunar Year and Weekdays in Xi’an, China
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...
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doaj-e20035cedbf84a838ce68eb549462a962020-11-24T22:27:35ZengMDPI AGAtmosphere2073-44332015-02-016219520810.3390/atmos6020195atmos6020195Characteristics of Black Carbon Aerosol during the Chinese Lunar Year and Weekdays in Xi’an, ChinaQiyuan Wang0Suixin Liu1Yaqing Zhou2Junji Cao3Yongming Han4Haiyan Ni5Ningning Zhang6Rujin Huang7Key Laboratory of Aerosol Chemistry & Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, ChinaKey Laboratory of Aerosol Chemistry & Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, ChinaKey Laboratory of Aerosol Chemistry & Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, ChinaKey Laboratory of Aerosol Chemistry & Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, ChinaKey Laboratory of Aerosol Chemistry & Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, ChinaKey Laboratory of Aerosol Chemistry & Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, ChinaKey Laboratory of Aerosol Chemistry & Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, ChinaKey Laboratory of Aerosol Chemistry & Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, ChinaBlack 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.http://www.mdpi.com/2073-4433/6/2/195refractory black carbonsize distributionmixing statecarbon monoxide |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Qiyuan Wang Suixin Liu Yaqing Zhou Junji Cao Yongming Han Haiyan Ni Ningning Zhang Rujin Huang |
spellingShingle |
Qiyuan Wang Suixin Liu Yaqing Zhou Junji Cao Yongming Han Haiyan Ni Ningning Zhang Rujin Huang Characteristics of Black Carbon Aerosol during the Chinese Lunar Year and Weekdays in Xi’an, China Atmosphere refractory black carbon size distribution mixing state carbon monoxide |
author_facet |
Qiyuan Wang Suixin Liu Yaqing Zhou Junji Cao Yongming Han Haiyan Ni Ningning Zhang Rujin Huang |
author_sort |
Qiyuan Wang |
title |
Characteristics of Black Carbon Aerosol during the Chinese Lunar Year and Weekdays in Xi’an, China |
title_short |
Characteristics of Black Carbon Aerosol during the Chinese Lunar Year and Weekdays in Xi’an, China |
title_full |
Characteristics of Black Carbon Aerosol during the Chinese Lunar Year and Weekdays in Xi’an, China |
title_fullStr |
Characteristics of Black Carbon Aerosol during the Chinese Lunar Year and Weekdays in Xi’an, China |
title_full_unstemmed |
Characteristics of Black Carbon Aerosol during the Chinese Lunar Year and Weekdays in Xi’an, China |
title_sort |
characteristics of black carbon aerosol during the chinese lunar year and weekdays in xi’an, china |
publisher |
MDPI AG |
series |
Atmosphere |
issn |
2073-4433 |
publishDate |
2015-02-01 |
description |
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. |
topic |
refractory black carbon size distribution mixing state carbon monoxide |
url |
http://www.mdpi.com/2073-4433/6/2/195 |
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