The composition of ambient and fresh biomass burning aerosols at a savannah site, South Africa
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Date
2016Author
Aurela, Minna
Beukes, Johan P.
Van Zyl, Pieter
Laakso, Lauri
Vakkari, Ville
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Show full item recordAbstract
Atmospheric aerosols play a key role in climate change, and have adverse effects on human health. Given
South Africa’s status as a rapidly-developing country with increasing urbanisation and industrial growth,
information on the quality of ambient air is important. In this study, the chemical composition of ambient
particles and the particles in fresh biomass burning plumes were studied at a savannah environment in
Botsalano, South Africa. The results showed that Botsalano was regularly affected by air masses that had
passed over several large point sources. Air masses that had passed over the coal-fired Matimba power
station in the Waterberg, or over the platinum group metal smelters in the western Bushveld Igneous Complex,
contained high sulfate concentrations in the submicron ranges. These concentrations were 14 to 37 times
higher compared with air masses that had passed only over rural areas. Because of the limited nature of this
type of data in literature for the interior regions of southern Africa, our report serves as a valuable reference
for future studies. In addition, our biomass burning study showed that potassium in the fresh smoke of
burning savannah grass was likely to take the form of KCl. Clear differences were found in the ratios for
potassium and levoglucosan in the smouldering and flaming phases. Our findings highlight the need for more
comprehensive chamber experiments on various fuel types used in southern Africa, to confirm the ratio of
important biomass burning tracer species that can be used in source apportionment studies in the future
URI
http://hdl.handle.net/10394/19855https://www.sajs.co.za/article/view/4081/6008
https://doi.org/10.17159/sajs.2016/20150223