Airborne studies of aerosol emissions from savanna fires in southern Africa: 2. Aerosol chemical composition

M. O. Andreae, T. W. Andreae, H. Annegarn, J. Beer, H. Cachier, P. Le Canut, W. Elbert, W. Maenhaut, I. Salma, F. G. Wienhold, T. Zenker

Research output: Contribution to journalArticle

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Abstract

We investigated smoke emissions from fires in savanna, forest, and agricultural ecosystems by airborne sampling of plumes close to prescribed burns and incidental fires in southern Africa. Aerosol samples were collected on glass fiber filters and on stacked filter units, consisting of a Nuclepore prefilter for particles larger than ∼1-2 μm and a Teflon second filter stage for the submicron fraction. The samples were analyzed for soluble ionic components, organic carbon, and black carbon. Onboard the research aircraft, particle number and volume distributions as a function of size were determined with a laser-optical particle counter and the black carbon content of the aerosol with an aethalometer. We determined the emission ratios (relative to CO2 and CO) and emission factors (relative to the amount of biomass burnt) for the various aerosol constituents. The smoke aerosols were rich in organic and black carbon, the latter representing 10-30% of the aerosol mass. K+ and NH4+ were the dominant cationic species in the smoke of most fires, while Cl- and SO42- were the most important anions. The aerosols were unusually rich in Cl-, probably due to the high Cl content of the semiarid vegetation. Comparison of the element budget of the fuel before and after the fires shows that the fraction of the elements released during combustion is highly variable between elements. In the case of the halogen elements, almost the entire amount released during the fire is present in the aerosol phase, while in the case of C, N, and S, only a small proportion ends up as particulate matter. This suggests that the latter elements are present predominantly as gaseous species in the fresh fire plumes studied here.

Original languageEnglish
Article number985D02280
Pages (from-to)32119-32128
Number of pages10
JournalJournal of Geophysical Research: Space Physics
Volume103
Issue numberD24
Publication statusPublished - 1998

Fingerprint

aerosols
Aerosols
Southern Africa
savanna
savannas
chemical composition
Fires
aerosol
filters
Chemical analysis
smoke
black carbon
Smoke
Soot
carbon
Organic carbon
filter
Halogen elements
plumes
plume

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Atmospheric Science
  • Astronomy and Astrophysics
  • Oceanography

Cite this

Andreae, M. O., Andreae, T. W., Annegarn, H., Beer, J., Cachier, H., Le Canut, P., ... Zenker, T. (1998). Airborne studies of aerosol emissions from savanna fires in southern Africa: 2. Aerosol chemical composition. Journal of Geophysical Research: Space Physics, 103(D24), 32119-32128. [985D02280].

Airborne studies of aerosol emissions from savanna fires in southern Africa : 2. Aerosol chemical composition. / Andreae, M. O.; Andreae, T. W.; Annegarn, H.; Beer, J.; Cachier, H.; Le Canut, P.; Elbert, W.; Maenhaut, W.; Salma, I.; Wienhold, F. G.; Zenker, T.

In: Journal of Geophysical Research: Space Physics, Vol. 103, No. D24, 985D02280, 1998, p. 32119-32128.

Research output: Contribution to journalArticle

Andreae, MO, Andreae, TW, Annegarn, H, Beer, J, Cachier, H, Le Canut, P, Elbert, W, Maenhaut, W, Salma, I, Wienhold, FG & Zenker, T 1998, 'Airborne studies of aerosol emissions from savanna fires in southern Africa: 2. Aerosol chemical composition', Journal of Geophysical Research: Space Physics, vol. 103, no. D24, 985D02280, pp. 32119-32128.
Andreae MO, Andreae TW, Annegarn H, Beer J, Cachier H, Le Canut P et al. Airborne studies of aerosol emissions from savanna fires in southern Africa: 2. Aerosol chemical composition. Journal of Geophysical Research: Space Physics. 1998;103(D24):32119-32128. 985D02280.
Andreae, M. O. ; Andreae, T. W. ; Annegarn, H. ; Beer, J. ; Cachier, H. ; Le Canut, P. ; Elbert, W. ; Maenhaut, W. ; Salma, I. ; Wienhold, F. G. ; Zenker, T. / Airborne studies of aerosol emissions from savanna fires in southern Africa : 2. Aerosol chemical composition. In: Journal of Geophysical Research: Space Physics. 1998 ; Vol. 103, No. D24. pp. 32119-32128.
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abstract = "We investigated smoke emissions from fires in savanna, forest, and agricultural ecosystems by airborne sampling of plumes close to prescribed burns and incidental fires in southern Africa. Aerosol samples were collected on glass fiber filters and on stacked filter units, consisting of a Nuclepore prefilter for particles larger than ∼1-2 μm and a Teflon second filter stage for the submicron fraction. The samples were analyzed for soluble ionic components, organic carbon, and black carbon. Onboard the research aircraft, particle number and volume distributions as a function of size were determined with a laser-optical particle counter and the black carbon content of the aerosol with an aethalometer. We determined the emission ratios (relative to CO2 and CO) and emission factors (relative to the amount of biomass burnt) for the various aerosol constituents. The smoke aerosols were rich in organic and black carbon, the latter representing 10-30{\%} of the aerosol mass. K+ and NH4+ were the dominant cationic species in the smoke of most fires, while Cl- and SO42- were the most important anions. The aerosols were unusually rich in Cl-, probably due to the high Cl content of the semiarid vegetation. Comparison of the element budget of the fuel before and after the fires shows that the fraction of the elements released during combustion is highly variable between elements. In the case of the halogen elements, almost the entire amount released during the fire is present in the aerosol phase, while in the case of C, N, and S, only a small proportion ends up as particulate matter. This suggests that the latter elements are present predominantly as gaseous species in the fresh fire plumes studied here.",
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