Measuring the morphology and density of internally mixed black carbon   with SP2 and VTDMA: new insight into the absorption enhancement of black   carbon in the atmosphere

doi:10.5194/amt-9-1833-2016

CORC > 北京大学 > 环境科学与工程学院

	Measuring the morphology and density of internally mixed black carbon with SP2 and VTDMA: new insight into the absorption enhancement of black carbon in the atmosphere
	Zhang, Yuxuan ; Zhang, Qiang ; Cheng, Yafang ; Su, Hang ; Kecorius, Simonas ; Wang, Zhibin ; Wu, Zhijun ; Hu, Min ; Zhu, Tong ; Wiedensohler, Alfred ; He, Kebin
刊名	ATMOSPHERIC MEASUREMENT TECHNIQUES
	2016
关键词	AERODYNAMIC DIAMETER MEASUREMENTS DIFFERENTIAL MOBILITY ANALYZER PARTICLE SOOT PHOTOMETER OPTICAL-PROPERTIES MIXING STATE LIGHT-ABSORPTION AEROSOL-PARTICLES MASS DEPENDENCE URBAN
DOI	10.5194/amt-9-1833-2016
英文摘要	The morphology and density of black carbon (BC) cores in internally mixed BC (In-BC) particles affect their mixing state and absorption enhancement. In this work, we developed a new method to measure the morphology and effective density of the BC cores of ambient In-BC particles using a single-particle soot photometer (SP2) and a volatility tandem differential mobility analyzer (VTDMA) during the CAREBeijing-2013 campaign from 8 to 27 July 2013 at Xianghe Observatory. This new measurement system can select size-resolved ambient In-BC particles and measure the mobility diameter and mass of the In-BC cores. The morphology and effective density of the ambient In-BC cores are then calculated. For the In-BC cores in the atmosphere, changes in their dynamic shape factor (chi) and effective density (rho(eff)) can be characterized as a function of the aging process (D-p/D-c) measured by SP2 and VTDMA. During an intensive field study, the ambient In-BC cores had an average shape factor chi of similar to 1.2 and an average density of similar to 1.2 g cm(-3), indicating that ambient In-BC cores have a near-spherical shape with an internal void of similar to 30 %. From the measured morphology and density, the average shell / core ratio and absorption enhancement (E-ab) of ambient BC were estimated to be 2.1-2.7 and 1.6-1.9, respectively, for In-BC particles with sizes of 200-350 nm. When the In-BC cores were assumed to have a void-free BC sphere with a density of 1.8 g cm(-3), the shell / core ratio and E-ab were overestimated by similar to 13 and similar to 17 %, respectively. The new approach developed in this work improves the calculations of the mixing state and optical properties of ambient In-BC particles by quantifying the changes in the morphology and density of ambient In-BC cores during aging.; National Natural Science Foundation of China [41222036, 21221004, 21190054, 41330635, GZ 663]; Environmental Protection Commonweal Project of China [201409027]; SCI(E); ARTICLE; qiangzhang@tsinghua.edu.cn; h.su@mpic.de; 4; 1833-1843; 9
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/438857]
专题	环境科学与工程学院
推荐引用方式 GB/T 7714	Zhang, Yuxuan,Zhang, Qiang,Cheng, Yafang,et al. Measuring the morphology and density of internally mixed black carbon with SP2 and VTDMA: new insight into the absorption enhancement of black carbon in the atmosphere[J]. ATMOSPHERIC MEASUREMENT TECHNIQUES,2016.
APA	Zhang, Yuxuan.,Zhang, Qiang.,Cheng, Yafang.,Su, Hang.,Kecorius, Simonas.,...&He, Kebin.(2016).Measuring the morphology and density of internally mixed black carbon with SP2 and VTDMA: new insight into the absorption enhancement of black carbon in the atmosphere.ATMOSPHERIC MEASUREMENT TECHNIQUES.
MLA	Zhang, Yuxuan,et al."Measuring the morphology and density of internally mixed black carbon with SP2 and VTDMA: new insight into the absorption enhancement of black carbon in the atmosphere".ATMOSPHERIC MEASUREMENT TECHNIQUES (2016).