Light absorption of black carbon aerosol and its enhancement by mixing   state in an urban atmosphere in South China

doi:10.1016/j.atmosenv.2012.12.009

CORC > 北京大学 > 环境科学与工程学院

	Light absorption of black carbon aerosol and its enhancement by mixing state in an urban atmosphere in South China
	Lan, Zi-Juan ; Huang, Xiao-Feng ; Yu, Kuang-You ; Sun, Tian-Le ; Zeng, Li-Wu ; Hu, Min
刊名	大气环境
	2013
关键词	Photoacoustic soot spectrometer Single particle soot photometer Absorption Angstrom exponent Mass absorption efficiency Mixing state ORGANIC-CARBON BROWN CARBON SPECTRAL DEPENDENCE ELEMENTAL CARBON AETHALOMETER INSTRUMENT COMBUSTION PARTICLES TRENDS
DOI	10.1016/j.atmosenv.2012.12.009
英文摘要	The effects of black carbon (BC) aerosol on climate warming have been the study focus in the recent decade, and the reduction of BC is now expected to have significant near-term climate change mitigation. Large uncertainties of BC optical properties, however, still exist and seriously restrict the ability to quantify BC's climate effects. In this study, advanced instrumentation (a three-wavelength photoacoustic soot spectrometer (PASS-3) and a single particle soot photometer (SP2)) were used to measure black carbon aerosol and analyze Its optical properties in a mega-city in South China, Shenzhen, during the summer of 2011. The results indicated that the average BC mass concentration was 4.0 +/- 3.1 mu g m(-3) during the campaign, accounting for similar to 11% of the total PM2.5 mass concentration. The PM2.5 light absorption at 405, 532 and 781 nm was 37.1 +/- 28.1, 25.4 +/- 19.0 and 17.6 +/- 12.9 Mm(-1), respectively. The average absorption Angstrom exponent of PM2.5 in visual spectrum (AAE(405-785 nm)) was 1.1 +/- 0.1 during the campaign, indicating that the light absorbing carbon mainly came from vehicular emissions, with little contributions from biomass burning emissions. The mass absorption efficiency (MAE) of BC at 532 nm ranged from 5.0 to 8.5 m(2) g(-1) during the campaign, with an average of 6.5 +/- 0.5 m(2) g(-1), and showed an obvious diurnal pattern with high values in the daytime. The average percentage of internally mixed BC was 24.3 +/- 7.9% during the campaign, showing significant positive correlation relationship with the MAE of BC. More quantitative data analysis indicated that the internally mixed BC would amplify MAE by about 7% during the campaign, which stands in accordance with the new finding of a very recent Science magazine paper (Cappa et al., 2012) that the BC absorption enhancement due to internal mixing in the real atmosphere is relatively low, in apparent contrast to theoretical model predictions. (C) 2012 Elsevier Ltd. All rights reserved.; Environmental Sciences; Meteorology & Atmospheric Sciences; SCI(E); EI; 6; ARTICLE; 118-123; 69
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/224470]
专题	环境科学与工程学院
推荐引用方式 GB/T 7714	Lan, Zi-Juan,Huang, Xiao-Feng,Yu, Kuang-You,et al. Light absorption of black carbon aerosol and its enhancement by mixing state in an urban atmosphere in South China[J]. 大气环境,2013.
APA	Lan, Zi-Juan,Huang, Xiao-Feng,Yu, Kuang-You,Sun, Tian-Le,Zeng, Li-Wu,&Hu, Min.(2013).Light absorption of black carbon aerosol and its enhancement by mixing state in an urban atmosphere in South China.大气环境.
MLA	Lan, Zi-Juan,et al."Light absorption of black carbon aerosol and its enhancement by mixing state in an urban atmosphere in South China".大气环境 (2013).