气候变化领域集成服务门户(CCPortal): Understanding aerosol composition in a tropical inter-Andean valley impacted by agro-industrial and urban emissions

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DOI	10.5194/acp-22-8473-2022
	Understanding aerosol composition in a tropical inter-Andean valley impacted by agro-industrial and urban emissions
	Mateus-Fontecha, Lady; Vargas-Burbano, Angela; Jimenez, Rodrigo; Rojas, Nestor Y.; Rueda-Saa, German; van Pinxteren, Dominik; van Pinxteren, Manuela; Fomba, Khanneh Wadinga; Herrmann, Hartmut
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	8473
结束页码	8495
卷号	22 期号:13 页码:23
英文摘要	Agro-industrial areas are frequently affected by various sources of atmospheric pollutants that have a negative impact on public health and ecosystems. However, air quality in these areas is infrequently monitored because of their smaller population compared to large cities, especially in developing countries. The Cauca River valley (CRV) is an agro-industrial region in southwestern Colombia, where a large fraction of the area is devoted to sugarcane and livestock production. The CRV is also affected by road traffic and industrial emissions. This study aims to elucidate the chemical composition of particulate matter fine mode (PM2.5) and to identify the main pollutant sources before source attribution. A sampling campaign was carried out at a representative site in the CRV region, where daily averaged mass concentrations of PM2.5 and the concentrations of water-soluble ions, trace metals, organic and elemental carbon, and various fractions of organic compounds (carbohydrates, n alkanes, and polycyclic aromatic hydrocarbons - PAHs) were measured. The mean PM2.5 was 14.4 +/- 4.4 mu g m(-3), and the most abundant constituent was organic material (52.7 % +/- 18.4 %), followed by sulfate (12.7 % +/- 2.8 %), and elemental carbon (7.1 % f 2.5 %), which indicates the presence of secondary aerosol formation and incomplete combustion. Levoglucosan was present in all samples, with a mean concentration of (113.8 +/- 147.2 ng m(-3)), revealing biomass burning as a persistent source. Mass closure using the elemental carbon (EC) tracer method explained 88.4 % on PM2.5, whereas the organic tracer method explained 70.9 % of PM2.5. We attribute this difference to the lack of information of specific organic tracers for some sources, both primary and secondary. Organic material and inorganic ions were the dominant groups of species (79 % of PM2.5). OMprim and OMsec contribute 24.2 % and 28.5 % to PM2.5. Inorganic ions as sulfate, nitrate, and ammonia constitute 19.0 %, EC 7.1 %, dust 3.5%, particle-bounded water (PBW) 5.3 %, and trace element oxides (TEOs), 0.9 % of PM2.5. The aerosol was acidic, with a pH of 2.5 +/- 0.4, mainly because of the abundance of organic and sulfur compounds. Diagnostic ratios and tracer concentrations indicate that most PM2.5 was emitted locally and had contributions of both pyrogenic and petrogenic sources, that biomass burning was ubiquitous during the sampling period and was the main source of PAHs, and that the relatively low PM2.5 concentrations and mutagenic potentials are consistent with low-intensity, year-long biomass burning (BB) and sugarcane pre-harvest burning in the CRY.
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:000820333400001
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/273149
作者单位	Universidad Nacional de Colombia; Universidad Nacional de Colombia; Leibniz Institut fur Tropospharenforschung (TROPOS)
推荐引用方式 GB/T 7714	Mateus-Fontecha, Lady,Vargas-Burbano, Angela,Jimenez, Rodrigo,et al. Understanding aerosol composition in a tropical inter-Andean valley impacted by agro-industrial and urban emissions[J],2022,22(13):23.
APA	Mateus-Fontecha, Lady.,Vargas-Burbano, Angela.,Jimenez, Rodrigo.,Rojas, Nestor Y..,Rueda-Saa, German.,...&Herrmann, Hartmut.(2022).Understanding aerosol composition in a tropical inter-Andean valley impacted by agro-industrial and urban emissions.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(13),23.
MLA	Mateus-Fontecha, Lady,et al."Understanding aerosol composition in a tropical inter-Andean valley impacted by agro-industrial and urban emissions".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.13(2022):23.