dc.contributor.author |
Xulu, NA
|
|
dc.contributor.author |
Piketh, SJ
|
|
dc.contributor.author |
Feig, GT
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|
dc.contributor.author |
Lack, DA
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|
dc.contributor.author |
Garland, Rebecca M
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|
dc.date.accessioned |
2021-02-26T12:50:06Z |
|
dc.date.available |
2021-02-26T12:50:06Z |
|
dc.date.issued |
2020-08 |
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dc.identifier.citation |
Xulu, N., Piketh, S., Feig, G., Lack, D. & Garland, R.M. 2020. Characterizing light-absorbing aerosols in a low-income settlement in South Africa. <i>Aerosol and Air Quality Research, 20(8).</i> http://hdl.handle.net/10204/11807 |
en_ZA |
dc.identifier.issn |
1680-8584 |
|
dc.identifier.issn |
2071-1409 |
|
dc.identifier.uri |
http://hdl.handle.net/10204/11807
|
|
dc.description.abstract |
Light-absorbing aerosols, particularly black carbon (BC), have significant impacts on human health and the climate. They are also the least-studied fraction of atmospheric particles, particularly in residential areas of southern Africa. The optical characteristics of ground-based light-absorbing aerosols from Kwadela Township in South Africa are investigated in this study. Daily averaged ambient PM2.5 highest levels were 51.39 µg m3 and 32.18 µg m3, whereas hourly averages peaked at 61.31 µg m3 and 34.69 µg m3 during winter and summer, respectively. Levels of daily averaged light–absorbing aerosols were 2.9 times higher (1.89 ± 0.5 µg m3) in winter 2014 than in summer 2015 (0.66 ± 0.2 µg m3). In both seasons, hourly averaged levels showed bimodal diurnal cycles, which correlated with the PM2.5 diurnal patterns that indicated distinct peaks in the morning and evening. These diurnal cycle peak periods corresponded with the times of increased solid domestic fuel usage, road traffic, and also shallower boundary layer. On average, light-absorbing aerosols contributed a larger proportion of total ambient PM2.5 levels in winter (6.5 ± 1.0 %) than in summer (3.4 ± 1.0 %). The winter average Absorption Ångstrm exponent AAE(370/880 nm) (1.7± 0.5), indicated the dominance of brown carbon (BrC) from biofuel/biomass burning and/or low-quality coal combustion emissions. In summer, the average AAE(370/950 nm) (1.3 ± 0.7), suggested the presence of BC and BrC in the mornings and evenings possibly from fossil fuel combustion sources. At midday and at night in summer, the AAE was close to 1, suggesting more BC contributions from sources such as diesel emissions during this time. A combination of BC and BrC particulates dominated on 50 % and 5 % of the summer days, respectively, whereas fresh BC were only measured in summer days (23 %). Residential solid-fuel and/biomass combustion are important sources of light-absorbing aerosols in this study region, with concomitant human health and environmental impacts. |
en_US |
dc.format |
Fulltext |
en_US |
dc.language.iso |
en |
en_US |
dc.relation.uri |
https://doi.org/10.4209/aaqr.2019.09.0443 |
en_US |
dc.relation.uri |
https://aaqr.org/articles/aaqr-19-09-opaa-0443 |
en_US |
dc.source |
Aerosol and Air Quality Research, 20(8) |
en_US |
dc.subject |
Light-absorbing aerosols |
en_US |
dc.subject |
Absorption Ångstrom exponent |
en_US |
dc.subject |
Residential solid-fuel combustion |
en_US |
dc.subject |
Aethalometer |
en_US |
dc.subject |
Mpumalanga |
en_US |
dc.title |
Characterizing light-absorbing aerosols in a low-income settlement in South Africa |
en_US |
dc.type |
Article |
en_US |
dc.description.pages |
21 |
en_US |
dc.description.note |
Copyright The Author's institution. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited. |
en_US |
dc.description.cluster |
Smart Places |
en_US |
dc.description.impactarea |
Climate and Air quality modelling |
en_US |
dc.identifier.apacitation |
Xulu, N., Piketh, S., Feig, G., Lack, D., & Garland, R. M. (2020). Characterizing light-absorbing aerosols in a low-income settlement in South Africa. <i>Aerosol and Air Quality Research, 20(8)</i>, http://hdl.handle.net/10204/11807 |
en_ZA |
dc.identifier.chicagocitation |
Xulu, NA, SJ Piketh, GT Feig, DA Lack, and Rebecca M Garland "Characterizing light-absorbing aerosols in a low-income settlement in South Africa." <i>Aerosol and Air Quality Research, 20(8)</i> (2020) http://hdl.handle.net/10204/11807 |
en_ZA |
dc.identifier.vancouvercitation |
Xulu N, Piketh S, Feig G, Lack D, Garland RM. Characterizing light-absorbing aerosols in a low-income settlement in South Africa. Aerosol and Air Quality Research, 20(8). 2020; http://hdl.handle.net/10204/11807. |
en_ZA |
dc.identifier.ris |
TY - Article
AU - Xulu, NA
AU - Piketh, SJ
AU - Feig, GT
AU - Lack, DA
AU - Garland, Rebecca M
AB - Light-absorbing aerosols, particularly black carbon (BC), have significant impacts on human health and the climate. They are also the least-studied fraction of atmospheric particles, particularly in residential areas of southern Africa. The optical characteristics of ground-based light-absorbing aerosols from Kwadela Township in South Africa are investigated in this study. Daily averaged ambient PM2.5 highest levels were 51.39 µg m3 and 32.18 µg m3, whereas hourly averages peaked at 61.31 µg m3 and 34.69 µg m3 during winter and summer, respectively. Levels of daily averaged light–absorbing aerosols were 2.9 times higher (1.89 ± 0.5 µg m3) in winter 2014 than in summer 2015 (0.66 ± 0.2 µg m3). In both seasons, hourly averaged levels showed bimodal diurnal cycles, which correlated with the PM2.5 diurnal patterns that indicated distinct peaks in the morning and evening. These diurnal cycle peak periods corresponded with the times of increased solid domestic fuel usage, road traffic, and also shallower boundary layer. On average, light-absorbing aerosols contributed a larger proportion of total ambient PM2.5 levels in winter (6.5 ± 1.0 %) than in summer (3.4 ± 1.0 %). The winter average Absorption Ångstrm exponent AAE(370/880 nm) (1.7± 0.5), indicated the dominance of brown carbon (BrC) from biofuel/biomass burning and/or low-quality coal combustion emissions. In summer, the average AAE(370/950 nm) (1.3 ± 0.7), suggested the presence of BC and BrC in the mornings and evenings possibly from fossil fuel combustion sources. At midday and at night in summer, the AAE was close to 1, suggesting more BC contributions from sources such as diesel emissions during this time. A combination of BC and BrC particulates dominated on 50 % and 5 % of the summer days, respectively, whereas fresh BC were only measured in summer days (23 %). Residential solid-fuel and/biomass combustion are important sources of light-absorbing aerosols in this study region, with concomitant human health and environmental impacts.
DA - 2020-08
DB - ResearchSpace
DP - CSIR
J1 - Aerosol and Air Quality Research, 20(8)
KW - Light-absorbing aerosols
KW - Absorption Ångstrom exponent
KW - Residential solid-fuel combustion
KW - Aethalometer
KW - Mpumalanga
LK - https://researchspace.csir.co.za
PY - 2020
SM - 1680-8584
SM - 2071-1409
T1 - Characterizing light-absorbing aerosols in a low-income settlement in South Africa
TI - Characterizing light-absorbing aerosols in a low-income settlement in South Africa
UR - http://hdl.handle.net/10204/11807
ER - |
en_ZA |
dc.identifier.worklist |
24272 |
en_US |