气候变化领域集成服务门户(CCPortal): Increase in secondary organic aerosol in an urban environment

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DOI	10.5194/acp-21-8323-2021
	Increase in secondary organic aerosol in an urban environment
	Via M.; Minguillón M.C.; Reche C.; Querol X.; Alastuey A.
发表日期	2021
ISSN	1680-7316
起始页码	8323
结束页码	8339
卷号	21 期号:10
英文摘要	The evolution of fine aerosol (PM1) species as well as the contribution of potential sources to the total organic aerosol (OA) at an urban background site in Barcelona, in the western Mediterranean basin (WMB) was investigated. For this purpose, a quadrupole aerosol chemical speciation monitor (Q-ACSM) was deployed to acquire real-time measurements for two 1-year periods: May 2014 May 2015 (period A) and September 2017 October 2018 (period B). Total PM1 concentrations showed a slight decrease (from 10.1 to 9.6 μgm-3 from A to B), although the relative contribution of inorganic and organic compounds varied significantly. Regarding inorganic compounds, SO2- 4 , black carbon (BC) and NHC 4 showed a significant decrease from period A to B (-21 %, -18% and -9 %, respectively), whilst NO-3 concentrations were higher in B (C8 %). Source apportionment revealed OA contained 46% and 70% secondary OA (SOA) in periods A and B, respectively. Two secondary oxygenated OA sources (OOA) were differentiated by their oxidation status (i.e. ageing): less oxidized (LO-OOA) and more oxidized (MO-OOA). Disregarding winter periods, when LO-OOA production was not favoured, LO-OOA transformation into MO-OOA was found to be more effective in period B. The lowest LO-OOA-to-MO-OOA ratio, excluding winter, was in September October 2018 (0.65), implying an accumulation of aged OA after the high temperature and solar radiation conditions in the summer season. In addition to temperature, SOA (sum of OOA factors) was enhanced by exposure to NOx-polluted ambient and other pollutants, especially to O3 and during afternoon hours. The anthropogenic primary OA sources identified, cooking-related OA (COA), hydrocarbon-like OA (HOA), and biomass burning OA (BBOA), decreased from period A to B in both absolute concentrations and relative contribution (as a whole, 44% and 30 %, respectively). However, their concentrations and proportion to OA grew rapidly during highly polluted episodes. The influence of certain atmospheric episodes on OA sources was also assessed. Both SOA factors were boosted with long- and medium-range circulations, especially those coming from inland Europe and the Mediterranean (triggering mainly MO-OOA) and summer breeze-driven regional circulation (mainly LO-OOA). In contrast, POA was enhanced either during air-renewal episodes or stagnation anticyclonic events. © 2021 EDP Sciences. All rights reserved.
语种	英语
scopus关键词	accumulation; aerosol; aerosol composition; black carbon; measurement method; point source; real time; urban area; urban atmosphere; Barcelona [Barcelona (PRV)]; Barcelona [Catalonia]; Catalonia; Spain; Varanidae
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/246846
作者单位	Institute of Environmental Assessment and Water Research (IDAEA-CSIC), Barcelona, 08034, Spain; Department of Applied Physics, University of Barcelona, Barcelona, 08028, Spain
推荐引用方式 GB/T 7714	Via M.,Minguillón M.C.,Reche C.,et al. Increase in secondary organic aerosol in an urban environment[J],2021,21(10).
APA	Via M.,Minguillón M.C.,Reche C.,Querol X.,&Alastuey A..(2021).Increase in secondary organic aerosol in an urban environment.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(10).
MLA	Via M.,et al."Increase in secondary organic aerosol in an urban environment".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.10(2021).