Analysis of incoming biomass burning aerosol plumes over southern Brazil

Oliveira, Aline Macedo de; Mariano, Glauber Lopes; Alonso, Marcelo Félix; Mariano, Ericka Voss Chagas

doi:10.1002/asl.689

Cited by 9 publications

(4 citation statements)

References 22 publications

(25 reference statements)

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“…This situation would facilitate the long-range transport of the aerosols from Amazonia to the PO site. Our results add to the understanding of the BB aerosol transport routes in South America and confirm the findings from previous studies on the importance of BB for the boundary layer aerosol budgets-e.g., [15][16][17][18][19][21][22][23][24][25][26].…”

Section: Discussionmentioning

confidence: 99%

“…This region is affected by both local or short-range BB emissions as well as by remote or long-range transport of BB aerosols [11,15]. The long-range tropospheric transport of pollutants is caused by Amazon rainforest wildfires in South America-e.g., [16][17][18][19]. These aerosols and gas-phase species are transported to the south by the South American low-level jet (SALLJ), which is a low-level flow with a jet vertical profile whose maximum intensity is below 1.5 km above ground level (AGL) [20].…”

Section: Introductionmentioning

confidence: 99%

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Biomass Burning Aerosol Observations and Transport over Northern and Central Argentina: A Case Study

Mulena,

Asmi,

Ruiz

et al. 2024

Remote Sensing

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The characteristics of South American biomass burning (BB) aerosols transported over northern and central Argentina were investigated from July to December 2019. This period was chosen due to the high aerosol optical depth values found in the region and because simultaneously intensive biomass burning took place over the Amazon. More specifically, a combination of remote sensing observations with simulated air parcel back trajectories was used to link the optical and physical properties of three BB aerosol events that affected Pilar Observatory (PO, Argentina, 31°41′S, 63°53′W, 338 m above sea level), with low-level atmospheric circulation patterns and with types of vegetation burned in specific fire regions. The lidar observations at the PO site were used for the first time to characterize the vertical extent and structure of BB aerosol plumes as well as their connection with the planetary boundary layer, and dust particles. Based mainly on the air-parcel trajectories, a local transport regime and a long transport regime were identified. We found that in all the BB aerosol event cases studied in this paper, light-absorbing fine-mode aerosols were detected, resulting mainly from a mixture of aging smoke and dust particles. In the remote transport regime, the main sources of the BB aerosols reaching PO were associated with Amazonian rainforest wildfires. These aerosols were transported into northern and central Argentina within a strong low-level jet circulation. During the local transport regime, the BB aerosols were linked with closer fires related to tropical forests, cropland, grassland, and scrub/shrubland vegetation types in southeastern South America. Moreover, aerosols carried by the remote transport regime were associated with a high aerosol loading and enhanced aging and relatively smaller particle sizes, while aerosols associated with the local transport pattern were consistently less affected by the aging effect and showed larger sizes and low aerosol loading.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Biomass Burning Aerosol Observations and Transport over Northern and Central Argentina: A Case Study

Mulena,

Asmi,

Ruiz

et al. 2024

Remote Sensing

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“…Numerous studies have been carried out to study atmospheric aerosols, as well as their regional transport (Ulke et al, 2007(Ulke et al, , 2011De Oliveira et al, 2016;Martins et al, 2018;Cúneo et al, 2022). Works of Ulke et al (2007) and Martins et al (2018 have highlighted the influence of the Southern American low-level jet (SALLJ) on the regional transport of smoke plume over South America.…”

Section: Intercontinental Transportmentioning

confidence: 99%

Comment on egusphere-2024-921

2024

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“…Freitas et al (2005) observed that the position of the South Atlantic subtropical high pressure plays an important role in the transport of aerosol plumes from the Amazon region to Southern Brazil. This system also prevents rain-bearing cold fronts from penetrating the area, favouring the accumulation of pollutants and deterioration of the air quality (Oliveira et al, 2016;Targino and Krecl, 2016).…”

Section: Introductionmentioning

confidence: 99%

Surface ozone climatology of South Eastern Brazil and the impact of biomass burning events

Targino

Harrison

Krecl

et al. 2019

Journal of Environmental Management

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In the austral spring, biomass fires affect a vast area of South America each year. We combined in situ ozone (O3) data, measured in the states of São Paulo and Paraná, Brazil, in the period 2014-2017, with aerosol optical depth, co-pollutants (NOx, PM2.5 and PM10) and air backtrajectories to identify sources, transport and geographical patterns in the air pollution data. We applied cluster analysis to hourly O3 data and split the investigation area of approximately 290,000 km 2 into five groups with similar features in terms of diurnal, weekly, monthly and seasonal O3 concentrations. All groups presented a peak in September and October, associated with the fire activities and enhanced photochemistry. The highest mean O3 concentrations were measured inland whilst, besides having lower concentrations, the coastal group was also associated with the smallest diurnal and seasonal variations. The latter was attributed to lower photochemical activity due to frequently occurring overcast weather situation. The mean annual regional contribution of O3 over the area was 61 g/m 3 , with large seasonal and intersite variabilities (from 35 to 84 g/m 3). The long-range transport of smoke contributed with between 23 and 41% of the total O3 during the pollution events. A pollution outbreak in September 2015 caused many-fold increases in O3, PM2.5 and PM10 across the investigation area, which exceeded the World Health Organisation recommendations. We show that the regional transport of particulates and gas due to biomass burning overlays the local emissions in already highly polluted cities. Such an effect can outweigh local measures to curb anthropogenic air pollution in cities.

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Analysis of incoming biomass burning aerosol plumes over southern Brazil

Abstract: Abstract

Cited by 9 publications

References 22 publications

Biomass Burning Aerosol Observations and Transport over Northern and Central Argentina: A Case Study

Biomass Burning Aerosol Observations and Transport over Northern and Central Argentina: A Case Study

Comment on egusphere-2024-921

Surface ozone climatology of South Eastern Brazil and the impact of biomass burning events

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