气候变化领域集成服务门户(CCPortal): Bimodal distribution of size-resolved particle effective density: results from a short campaign in a rural environment over the North China Plain

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DOI	10.5194/acp-22-2029-2022
	Bimodal distribution of size-resolved particle effective density: results from a short campaign in a rural environment over the North China Plain
	Zhou, Yaqing; Ma, Nan; Wang, Qiaoqiao; Wang, Zhibin; Chen, Chunrong; Tao, Jiangchuan; Hong, Juan; Peng, Long; He, Yao; Xie, Linhong; Zhu, Shaowen; Zhang, Yuxuan; Li, Guo; Xu, Wanyun; Cheng, Peng; Kuhn, Uwe; Zhou, Guangsheng; Fu, Pingqing; Zhang, Qiang; Su, Hang; Cheng, Yafang
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	2029
结束页码	2047
卷号	22 期号:3 页码:19
英文摘要	Effective density is one of the most important physical properties of atmospheric particles. It is closely linked to particle chemical composition and morphology and could provide special information on particle emissions and aging processes. In this study, size-resolved particle effective density was measured with a combined differential mobility analyzer-centrifugal particle mass analyzer-condensation particle counter (DMA-CPMA-CPC) system in autumn 2019 as part of the Multiphase chemistry experiment in Fogs and Aerosols in the North China Plain (McFAN). With a newly developed flexible Gaussian fit algorithm, frequent (77 %-87 %) bimodal distribution of particle effective density is identified, with a low-density mode (named sub-density mode) accounting for 22 %-27 % of the total number of observed particles. The prevalence of the sub-density mode is closely related to fresh black carbon (BC) emissions. The geometric mean for the main density mode ((rho) over bar (eff,main)) increases from 1.18 +/- 0.10 g cm(-3) (50 nm) to 1.37 +/- 0.12 g cm(-3) (300 nm) due to a larger fraction of high-density components and a more significant restructuring effect at large particle sizes but decreases from 0.89 +/- 0.08 g cm(-3) (50 nm) to 0.62 +/- 0.12 g cm(-3) (300 nm) for the sub-density mode ((rho) over bar (eff,sub)), which could be mainly ascribed to the agglomerate effect of BC. (rho) over bar (eff,main) and (rho) over bar (eff,sub) show similar diurnal cycles with peaks in the early afternoon, mainly attributed to the increasing mass fraction of high material density components associated with secondary aerosol production, especially of secondary inorganic aerosol (SIA). To investigate the impact of chemical composition, bulk particle effective density was calculated based on measured chemical composition (rho(eff,ACSM)) and compared to the average effective density at 300 nm ((rho) over bar (eff,tot,300nm)). The best agreement between the two densities is achieved when assuming a BC effective density of 0.60 g cm(-3). The particle effective density is highly dependent on SIA and BC mass fractions. The influence of BC on the effective density is even stronger than SIA, implying the importance and necessity of including BC in the estimate of effective density for ambient particles.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000759286400001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273086
作者单位	Jinan University; Zhejiang University; Tsinghua University; Max Planck Society; Nanjing University; Chinese Academy of Meteorological Sciences (CAMS); Chinese Academy of Sciences; Jinan University; Chinese Academy of Meteorological Sciences (CAMS); Tianjin University
推荐引用方式 GB/T 7714	Zhou, Yaqing,Ma, Nan,Wang, Qiaoqiao,et al. Bimodal distribution of size-resolved particle effective density: results from a short campaign in a rural environment over the North China Plain[J],2022,22(3):19.
APA	Zhou, Yaqing.,Ma, Nan.,Wang, Qiaoqiao.,Wang, Zhibin.,Chen, Chunrong.,...&Cheng, Yafang.(2022).Bimodal distribution of size-resolved particle effective density: results from a short campaign in a rural environment over the North China Plain.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(3),19.
MLA	Zhou, Yaqing,et al."Bimodal distribution of size-resolved particle effective density: results from a short campaign in a rural environment over the North China Plain".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.3(2022):19.