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Biomass burning emissions and vertical distribution of atmospheric methyl halides and other reduced carbon gases in the South Atlantic region
Abstract
The NASA TRACE A experiment (September – October 1992) investigated effects of dry season biomass burning emissions from both South America and southern Africa on the tropical South Atlantic troposphere. Whole air canister samples were collected aboard the NASA DC‐8 aircraft and analyzed for a wide range of nonmethane hydrocarbons (NMHCs) and halocarbons. Fast response in situ quantification of CH 4, CO, and CO 2 were also performed on the DC‐8. Sampling took place over Brazilian agricultural areas and southern African savanna where there was active biomass burning. The vertical distribution of the measured gases revealed that the concentrations of most hydrocarbons, methyl halides, CH 4, CO, and CO 2, were enhanced in the boundary layer of these regions principally as a result of biomass fires. Brazilian and African biomass burning emission ratios were calculated for CH 3 Br, CH 3 Cl, CH 3 I, and NMHCs relative to CO and CO 2. Although both fire regions were dominated by efficient (flaming) combustion (CO/CO 2 ratios <0.1), the Brazilian samples exhibited the lower (more flaming) CO/CO 2 ratio of 0.037 compared with the African savanna value of 0.062. This difference in combustion efficiency was reflected in lower ratios versus CO 2 for all correlated gases. However, the gases more closely associated with smoldering combustion (e.g., C 3 H 8 and CH 3 Cl) exhibited significantly higher ratios relative to CO for the Brazilian fires, while the African samples exhibited higher values versus CO for compounds associated more closely with flaming combustion (e.g., C 2 H 2). This variation in the trace gas ratios versus CO is most likely caused by different fuel characteristics. On the basis of the emission ratios obtained, the total biomass burning emission rates for savannas and worldwide were calculated for the hydrocarbons and methyl halides. From these it was estimated that roughly 25% and 20% of global CH 3 Cl and CH 3 Br emissions, respectively, derive from biomass burning but that the contribution of biomass burning to total CH 3 I emissions was not significant.
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Citations
Cites
Development of a two-dimensional global tropospheric model: model chemistry
Hough, A. M. (1991) · Journal of Geophysical Research Atmospheres · doi:10.1029/90jd01327 · Cited by 169
Cited by
Carpenter, L. J., Sturges, W. T., Penkett, S. A., Liss, P. S., Alicke, B., Hebestreit, K., & Platt, U. (1999) · Journal of Geophysical Research: Atmospheres · doi:10.1029/98jd02746 · Cited by 342
Metadata
- Authors
- Blake, N. J., Blake, D. R., Sive, B. C., Chen, T., Rowland, F. S., Collins, J. E., Sachse, G. W., & Anderson, B. E.
- Venue
- Journal of Geophysical Research: Atmospheres
- Publisher
- American Geophysical Union (AGU)
- Published
- 1996-10
- Volume
- 101
- Issue
- D19
- Pages
- 24151-24164
- ISSN
- 0148-0227 (ISSN-L)
- OpenAlex
- W1989438093
- Cited by
- 213
- References
- 1
- FWCI
- 12.77
- Type
- journal article
- Language
- en
- Open access
- closed
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- CoChat. (2026). Citation check: Biomass burning emissions and vertical distribution of atmospheric methyl halides and other reduced carbon gases in the South Atlantic region. https://app.cochat.ai/papers/10.1029/96jd00561
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- Blake, N. J., Blake, D. R., Sive, B. C., Chen, T., Rowland, F. S., Collins, J. E., Sachse, G. W., & Anderson, B. E. (1996). Biomass burning emissions and vertical distribution of atmospheric methyl halides and other reduced carbon gases in the South Atlantic region. Journal of Geophysical Research: Atmospheres. https://doi.org/10.1029/96jd00561
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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