气候变化领域集成服务门户(CCPortal): Long-term brown carbon and smoke tracer observations in Bogotá; Colombia: Association with medium-range transport of biomass burning plumes

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DOI	10.5194/acp-20-7459-2020
	Long-term brown carbon and smoke tracer observations in Bogotá; Colombia: Association with medium-range transport of biomass burning plumes
	Manuel Rincón-Riveros J.; Alejandra Rincón-Caro M.; Sullivan A.P.; Felipe Mendez-Espinosa J.; Carlos Belalcazar L.; Quirama Aguilar M.; Morales Betancourt R.
发表日期	2020
ISSN	1680-7316
起始页码	7459
结束页码	7472
卷号	20 期号:12
英文摘要	Light-absorbing aerosols emitted during open biomass burning (BB) events such as wildfires and agricultural burns have a strong impact on the Earth s radiation budget through both direct and indirect effects. Additionally, BB aerosols and gas-phase emissions can substantially reduce air quality at local, regional, and global scales, negatively affecting human health. South America is one of largest contributors to BB emissions globally. After Amazonia, the BB emissions from wildfires and agricultural burns in the grassland plains of northern South America (NSA) are the most significant in the region. However, few studies have analyzed the potential impact of NSA BB emissions on regional air quality. Recent evidence suggests that seasonal variations in air quality in several major cities in NSA could be associated with open biomass burning emissions, but it is still uncertain to what extent those sources impact air quality in the region. In this work, we report on 3 years of continuous equivalent black carbon (eBC) and brown carbon (BrC) observations at a hilltop site located upwind of the city of Bogotá, and we demonstrate its association with fires detected by the MODerate-resolution Imaging Spectroradiometer (MODIS) in a 3000 km_2000 km domain. Offline PM2:5 filter samples collected during three field campaigns were analyzed to quantify water-soluble organic carbon (WSOC), organic and elemental carbon (OC=EC), and biomass burning tracers such as levoglucosan, galactosan, and potassium. MODIS active fire data and HYSPLIT back trajectories were used to identify potential biomass burning plumes transported to the city. We analyzed the relationship between BrC, WSOC, water-soluble potassium, and levoglucosan to identify signals of the regional transport of BB aerosols. Our results confirm that regional biomass burning transport from wildfires occurs annually during the months of January and April. The seasonality of eBC closely followed that of PM2:5 at the city air quality stations; however, the observed seasonality of BrC is distinctly different to that of eBC and strongly associated with regional fire counts. The strong correlation between BrC and regional fire counts was observed at daily, weekly, and monthly timescales. WSOC at the measurement site was observed to increase linearly with levoglucosan during high BB periods and to remain constant at 2:5 ?gCm3 during the low BB seasons. Our findings show, for the first time in this region, that aged BB plumes can regularly reach densely populated areas in the Central Andes of northern South America. A source footprint analysis involving BrC observations, back trajectories, and remotely sensed fire activity shows that the eastern savannas in NSA are the main BB source region for the domain analyzed. © 2020 Copernicus GmbH. All rights reserved.
语种	英语
scopus关键词	aerosol; air quality; biomass burning; black carbon; brown carbon; MODIS; seasonal variation; smoke; tracer; transport process; wildfire; Bogota; Colombia
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/141252
作者单位	Civil and Environmental Engineering Department, Universidad de Los Andes, Bogotá, Colombia; Department of Atmospheric Science, Colorado State University, Fort Collins, CO, United States; Universidad Nacional de Colombia, Bogotá, Colombia
推荐引用方式 GB/T 7714	Manuel Rincón-Riveros J.,Alejandra Rincón-Caro M.,Sullivan A.P.,et al. Long-term brown carbon and smoke tracer observations in Bogotá; Colombia: Association with medium-range transport of biomass burning plumes[J],2020,20(12).
APA	Manuel Rincón-Riveros J..,Alejandra Rincón-Caro M..,Sullivan A.P..,Felipe Mendez-Espinosa J..,Carlos Belalcazar L..,...&Morales Betancourt R..(2020).Long-term brown carbon and smoke tracer observations in Bogotá; Colombia: Association with medium-range transport of biomass burning plumes.Atmospheric Chemistry and Physics,20(12).
MLA	Manuel Rincón-Riveros J.,et al."Long-term brown carbon and smoke tracer observations in Bogotá; Colombia: Association with medium-range transport of biomass burning plumes".Atmospheric Chemistry and Physics 20.12(2020).