Ambient organic carbon to elemental carbon ratios: Influence of the   thermal-optical temperature protocol and implications

doi:10.1016/j.scitotenv.2013.08.084

CORC > 北京大学 > 环境科学与工程学院

	Ambient organic carbon to elemental carbon ratios: Influence of the thermal-optical temperature protocol and implications
	Cheng, Yuan ; He, Ke-bin ; Duan, Feng-kui ; Du, Zhen-yu ; Zheng, Mei ; Ma, Yong-liang
刊名	science of the total environment
	2014
关键词	PM2 (5) OC EC SOA WSOC Biomass burning AEROSOL LIGHT-ABSORPTION FINE PARTICULATE MATTER BLACK CARBON CHEMICAL-COMPOSITION SOURCE APPORTIONMENT BROWN CARBON CHINA PHASE IDENTIFICATION DEPENDENCE
DOI	10.1016/j.scitotenv.2013.08.084
英文摘要	Ambient organic carbon (OC) to elemental carbon (EC) ratios are strongly associated with not only the radiative forcing due to aerosols but also the extent of secondary organic aerosol (SOA) formation. An inter-comparison study was conducted based on fine particulate matter samples collected during summer in Beijing to investigate the influence of the thermal-optical temperature protocol on the OC to EC ratio. Five temperature protocols were used such that the NIOSH (National Institute for Occupational Safety and Health) and EUSAAR (European Supersites for Atmospheric Aerosol Research) protocols were run by the Sunset carbon analyzer while the IMPROVE (the Interagency Monitoring of Protected Visual Environments network)-A protocol and two alternative protocols designed based on NIOSH and EUSAAR were run by the DRI analyzer. The optical attenuation measured by the Sunset carbon analyzer was more easily biased by the shadowing effect, whereas total carbon agreed well between the Sunset and DRI analyzers. The ECIMPROVE-A (EC measured by the IMPROVE-A protocol; similar hereinafter) to ECNIOSH ratio and the ECIMPROVE-A to ECEUSAAR ratio averaged 1.36 +/- 0.21 and 0.91 +/- 0.10, respectively, both of which exhibited little dependence on the biomass burning contribution. Though the temperature protocol had substantial influence on the DC to EC ratio, the contributions of secondary organic carbon (SOC) to OC, which were predicted by the EC-tracer method, did not differ significantly among the five protocols. Moreover, the SOC contributions obtained in this study were comparable with previous results based on field observation (typically between 45 and 65%), but were substantially higher than the estimation provided by an air quality model (only 18%). The comparison of SOC and WSOC suggests that when using the transmittance charring correction, all of the three common protocols (i.e., IMPROVE-A, NIOSH and EUSAAR) could be reliable for the estimation of SOC by the EC-tracer method. (C) 2013 Elsevier B.V. All rights reserved.; Environmental Sciences; SCI(E); EI; 0; ARTICLE; ycheng@mail.tsinghua.edu.cn; hekb@tsinghua.edu.cn; 1103-1111; 468
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/216418]
专题	环境科学与工程学院
推荐引用方式 GB/T 7714	Cheng, Yuan,He, Ke-bin,Duan, Feng-kui,et al. Ambient organic carbon to elemental carbon ratios: Influence of the thermal-optical temperature protocol and implications[J]. science of the total environment,2014.
APA	Cheng, Yuan,He, Ke-bin,Duan, Feng-kui,Du, Zhen-yu,Zheng, Mei,&Ma, Yong-liang.(2014).Ambient organic carbon to elemental carbon ratios: Influence of the thermal-optical temperature protocol and implications.science of the total environment.
MLA	Cheng, Yuan,et al."Ambient organic carbon to elemental carbon ratios: Influence of the thermal-optical temperature protocol and implications".science of the total environment (2014).