气候变化领域集成服务门户(CCPortal): Characterizing the volatility and mixing state of ambient fine particles in the summer and winter of urban Beijing

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DOI	10.5194/acp-22-2293-2022
	Characterizing the volatility and mixing state of ambient fine particles in the summer and winter of urban Beijing
	Chen, Lu; Zhang, Fang; Collins, Don; Ren, Jingye; Liu, Jieyao; Jiang, Sihui; Li, Zhanqing
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	2293
结束页码	2307
卷号	22 期号:4 页码:15
英文摘要	Understanding the volatility of atmospheric aerosols is important for elucidating the formation of fine particles and to help determine their effect on the environment and climate. In this study, the volatility of fine particles (40, 80, 110, 150, 200, and 300 nm) is characterized by the size-dependent volatility shrink factor (VSF) for summer and winter in the urban area of Beijing using measurements of a volatility tandem differential mobility analyzer (VTDMA). We show that there are two persistent aerosol volatility modes (one high-volatility and one less- or non-volatile mode) present both in the summer and winter. On average, the particles are more volatile in the summer (with a mean VSF of 0.3) than in the winter (with a mean VSF of 0.6). Although the new particle formation (NPF) process requires low-volatility vapors to form molecular clusters and nuclei, the significant high-volatility mode around noon on NPF days indicates partitioning of volatile substances into the growing particles during summer. We further retrieve the mixing state of the ambient fine particles from the size-resolved VSF and find that the non-black carbon (BC) particles that formed from nucleation processes accounted for 52 %-69% of the total number concentration in the summer. On the other hand, particles containing a refractory core that is thought to be BC-containing particles dominate and contribute 67 %-77% toward the total number concentration in the winter. The diurnal cycles of the retrieved aerosol mixing state for the summer further support the conclusion that the nucleation process is the main contributor to non-BC particles. In addition, the extent of aging of BC particles was characterized as the ratio of the BC diameter before and after heating at 300 degrees C (D-p/D-c), showing that the average ratio of similar to 2.2 in the winter is higher than the average of similar to 1.5 in the summer, which indicates that BC aging may be less efficient in summertime. This would result in differences in light absorption enhancement between the cold and warm seasons.
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:000760392500001
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/273161
作者单位	Beijing Normal University; Harbin Institute of Technology; University of California System; University of California Riverside; University System of Maryland; University of Maryland College Park; University System of Maryland; University of Maryland College Park
推荐引用方式 GB/T 7714	Chen, Lu,Zhang, Fang,Collins, Don,et al. Characterizing the volatility and mixing state of ambient fine particles in the summer and winter of urban Beijing[J],2022,22(4):15.
APA	Chen, Lu.,Zhang, Fang.,Collins, Don.,Ren, Jingye.,Liu, Jieyao.,...&Li, Zhanqing.(2022).Characterizing the volatility and mixing state of ambient fine particles in the summer and winter of urban Beijing.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(4),15.
MLA	Chen, Lu,et al."Characterizing the volatility and mixing state of ambient fine particles in the summer and winter of urban Beijing".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.4(2022):15.