气候变化领域集成服务门户(CCPortal): Characterization of particle size distributions during winter haze episodes in urban air

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DOI	10.1016/j.atmosres.2019.04.033
	Characterization of particle size distributions during winter haze episodes in urban air
	Cheng Y.; Yan L.; Huang Y.; Wang Q.; Morawska L.; Zhaolin G.; Cao J.; Zhang L.; Li B.; Wang Y.
发表日期	2019
ISSN	0169-8095
起始页码	55
结束页码	67
卷号	228
英文摘要	Detail characterization of particle size distribution and its temporal evolution is one of the critical elements towards uncovering mechanisms behind haze formation, yet rarely conducted. To address this deficiency, we conducted comprehensive characterization of particle size distribution during winter in Xi'an, China. Real-time measurements were conducted using a TSI Fast Mobility Particle Sizer Model 3091 (FMPS, from 5.6 to 523 nm) in the Qujiang campus of Xi'an Jiaotong University in the period from December 4th, 2015 to January 8th, 2016. The FMPS readings were adjusted by factors derived from an intercomparison with a TSI Scanning Mobility Particle Sizer (consisting of a TSI DMA 3081 and a CPC 3772, from 15.1 to 850.8 nm). Seven haze episodes and two new particle formation episodes were recorded during the sampling campaign. Two (E1 and E6) of the seven haze episodes are investigated in this study. E1 was an prolonged episode starting from a new particle formation (NPF) episode, followed by low, sustained PM2.5 increase at an average growth rate of 2 μg m−3 per hour (from 37 μg m−3 to 262 μg m−3 within 155 h), while E6 was a short-term haze episode starting from a rapid increase in PM2.5 at an rapid growth rate of 27 μg m−3 (from 79 μg m−3 to 213 μg m−3 within only 5 h). The average total particle number concentrations (PNC) were 3.35 × 104 cm−3, 4.14 × 104 cm−3 and 3.99 × 104 cm−3 during normal days, E1, and E6, respectively, showing an increase in particle number concentration from normal days to haze days (p < .000 for E1 and p < .002 for E6, two-tailed t-test). While statically significant, the magnitude of the increase was not as large as of the increase in PM2.5 concentration. On normal days, the peak in particle number size distribution (PNSD) was centered at smaller particle sizes (around 60–70 nm, computed based on a normal distribution) and shifted towards larger sizes during the night (139 nm at 0:00 and 168 nm at 4:00 am). The diurnal variations of PNSD during E1 and E6 episodes were not as evident as the variations on normal days, with the centers of the major peaks at 179 nm for E1 and 137 nm for E6. It was found that significant changes in PNC and PNSD occurred during the PM2.5 increase phase of severe haze episodes, but not during the high concentration phase. Since the growth rates of PM2.5 varied during increase phase between E1 and E6, PM2.5 pollution formation mechanisms were different throughout evaluating growth rates as it relates to PM2.5, gaseous pollutants, PNC, PNSD, and meteorological variables in these processes. © 2019 Elsevier B.V.
英文关键词	Haze; New particle formation (NPF); Particle number concentration (PNC); Particle number size distribution (PNSD)
语种	英语
scopus关键词	Fog; Light transmission; Normal distribution; Particle size; Particle size analysis; Pollution; Size distribution; Fast mobility particle sizers; Haze; Meteorological variables; New particle formation; Particle number concentration; Particle number size distribution; Scanning mobility particle sizer; Xi'an Jiaotong University; Growth rate; concentration (composition); formation mechanism; haze; particle size; size distribution; temporal evolution; urban atmosphere; winter; Xian
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/162037
作者单位	School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, China; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710061, China; Key Laboratory of Aerosol Chemistry and Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710061, China; International Laboratory for Air Quality and Health, Queensland University of Technology, Brisbane, QLD 4001, Australia; School of Environmental Science and Engineering, Chang'an University, Xi'an, China
推荐引用方式 GB/T 7714	Cheng Y.,Yan L.,Huang Y.,et al. Characterization of particle size distributions during winter haze episodes in urban air[J],2019,228.
APA	Cheng Y..,Yan L..,Huang Y..,Wang Q..,Morawska L..,...&Wang Y..(2019).Characterization of particle size distributions during winter haze episodes in urban air.Atmospheric Research,228.
MLA	Cheng Y.,et al."Characterization of particle size distributions during winter haze episodes in urban air".Atmospheric Research 228(2019).