DOI: 10.1016/j.atmosres.2018.04.006
Scopus记录号: 2-s2.0-85046717777
论文题名: Characteristics and temporal variations of organic and elemental carbon aerosols in a high–altitude, tropical Latin American megacity
作者: Ramírez O. ; Sánchez de la Campa A.M. ; de la Rosa J.
刊名: Atmospheric Research
ISSN: 1698095
出版年: 2018
卷: 210 起始页码: 110
结束页码: 122
语种: 英语
英文关键词: Carbonaceous aerosol
; Colombia
; El Niño
; Megacity
; OC/EC
; PM10
Scopus关键词: Aerosols
; Air quality
; Climate change
; Deforestation
; Particles (particulate matter)
; Urban growth
; Carbonaceous aerosol
; Colombia
; Megacities
; OC/EC
; PM10
; Organic carbon
; aerosol
; altitude
; El Nino
; megacity
; organic carbon
; particulate matter
; temporal variation
; Bogota
; Colombia
英文摘要: Bogota is a Latin American megacity located at an average altitude of 2600 m in the tropical Andes. It registers frequent episodes of poor air quality due to high PM10 concentrations. The carbonaceous fraction is the main PM10 component (>50%), but there is a lack of specific studies analyzing the characteristics and temporal variability of organic carbon (OC) and elemental carbon (EC) aerosols. In this study, daily samples (24±1h) were collected from June 2015 to May 2016 (a total of 308 samples) at an urban background site during an El Niño year, and the quartz filters were analyzed using a thermal-optical method. Results showed that EC and organic matter accounted for ~60% of the PM10 mass. The OC and EC averages were 8.92 ± 4.52 μg/m3 and 3.25 ± 1.59 μg/m3, respectively. The months with the highest average OC values were January to March, while EC concentrations were relatively constant throughout the year. Regarding daily values, the highest mean concentrations of OC (10.2 ± 5.13 μg/m3) and EC (3.73 ± 1.74 μg/m3) were obtained on Thursdays, and the lowest on Sundays (OC = 6.67 ± 3.04 μg/m3 and EC = 2.46 ± 0.94 μg/m3). The OC/EC ratio ranged from 1.66 (June) to 4.88 (March), with an annual average of 3.16 ± 2.01. The secondary organic carbon (SOC) contributions, measured using the EC-tracer method, accounted for 45% of the total OC. The effective carbon ratio, which indicates an association between carbonaceous particles and climate change, ranged from 0.12 (July) to 0.74 (May). The study of air-mass origins revealed that days with air mass from E + NE registered the highest OC concentrations. This research provides new data on the variability of carbonaceous aerosols over the course of a year. It also highlights forest fires as a significant source of OC and EC, and indicates the high impact of SOC on OC concentration at the sampling site. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/108848
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Associate Unit CSIC–University of Huelva “Atmospheric Pollution”, Centre of Research in Sustainable Chemistry–CIQSO, University of Huelva, Campus de El Carmen s/n, Huelva, 21071, Spain; Department of Civil and Environmental, Universidad de la Costa, Calle 58 #55–66, Barranquilla, 080002, Colombia; Department of Earth Sciences, University of Huelva, Campus de El Carmen s/n, Huelva, 21071, Spain
Recommended Citation:
Ramírez O.,Sánchez de la Campa A.M.,de la Rosa J.. Characteristics and temporal variations of organic and elemental carbon aerosols in a high–altitude, tropical Latin American megacity[J]. Atmospheric Research,2018-01-01,210