气候变化领域集成服务门户(CCPortal): Measurement report: Interpretation of wide-range particulate matter size distributions in Delhi

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DOI	10.5194/acp-22-5415-2022
	Measurement report: Interpretation of wide-range particulate matter size distributions in Delhi
	Sahin, Ulku Alver; Harrison, Roy M.; Alam, Mohammed S.; Beddows, David C. S.; Bousiotis, Dimitrios; Shi, Zongbo; Crilley, Leigh R.; Bloss, William; Brean, James; Khanna, Isha; Verma, Rulan
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	5415
结束页码	5433
卷号	22 期号:8 页码:19
英文摘要	Delhi is one of the world's most polluted cities, with very high concentrations of airborne particulate matter. However, little is known about the factors controlling the characteristics of wide-range particle number size distributions. Here, new measurements are reported from three field campaigns conducted in winter and pre-monsoon and post-monsoon seasons at the Indian Institute of Technology campus in the south of the city. Particle number size distributions were measured simultaneously, using a scanning mobility particle sizer and a GRIMM optical particle monitor, covering 15 nm to > 10 mu m diameter. The merged, wide-range size distributions were categorized into the following five size ranges: nucleation (15-20 nm), Aitken (20-100 nm), accumulation (100 nm-1 mu m), large fine (1-2.5 mu m), and coarse (2.5-10 mu m) particles. The ultrafine fraction (15-100 nm) accounts for about 52 % of all particles by number (PN10 is the total particle number from 15 nm to 10 mu m) but just 1 % by PM10 volume (PV10 is the total particle volume from 15 nm to 10 mu m). The measured size distributions are markedly coarser than most from other parts of the world but are consistent with earlier cascade impactor data from Delhi. Our results suggest substantial aerosol processing by coagulation, condensation, and water uptake in the heavily polluted atmosphere, which takes place mostly at nighttime and in the morning hours. Total number concentrations are highest in winter, but the mode of the distribution is largest in the post-monsoon (autumn) season. The accumulation mode particles dominate the particle volume in autumn and winter, while the coarse mode dominates in summer. Polar plots show a huge variation between both size fractions in the same season and between seasons for the same size fraction. The diurnal pattern of particle numbers is strongly reflective of a road traffic influence upon concentrations, especially in autumn and winter, although other sources, such as cooking and domestic heating, may influence the evening peak. There is a clear influence of diesel traffic at nighttime, when it is permitted to enter the city, and also indications in the size distribution data of a mode < 15 nm, which is probably attributable to CNG/LPG vehicles. New particle formation appears to be infrequent and is, in this dataset, limited to 1 d in the summer campaign. Our results reveal that the very high emissions of airborne particles in Delhi, particularly from traffic, determine the variation in particle number size distributions.
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:000786548900001
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/273586
作者单位	Istanbul University - Cerrahpasa; University of Birmingham; UK Research & Innovation (UKRI); Natural Environment Research Council (NERC); NERC National Centre for Atmospheric Science; University of York - UK; York University - Canada; King Abdulaziz University; University of Nottingham; Indian Institute of Technology System (IIT System); Indian Institute of Technology (IIT) - Delhi
推荐引用方式 GB/T 7714	Sahin, Ulku Alver,Harrison, Roy M.,Alam, Mohammed S.,et al. Measurement report: Interpretation of wide-range particulate matter size distributions in Delhi[J],2022,22(8):19.
APA	Sahin, Ulku Alver.,Harrison, Roy M..,Alam, Mohammed S..,Beddows, David C. S..,Bousiotis, Dimitrios.,...&Verma, Rulan.(2022).Measurement report: Interpretation of wide-range particulate matter size distributions in Delhi.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(8),19.
MLA	Sahin, Ulku Alver,et al."Measurement report: Interpretation of wide-range particulate matter size distributions in Delhi".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.8(2022):19.