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| Titel |
Greenhouse gas emissions from laboratory-scale fires in wildland fuels depend on fire spread mode and phase of combustion |
| VerfasserIn |
N. C. Surawski, A. L. Sullivan, C. P. Meyer, S. H. Roxburgh, P. J. Polglase |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 15, no. 9 ; Nr. 15, no. 9 (2015-05-13), S.5259-5273 |
| Datensatznummer |
250119707
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| Publikation (Nr.) |
 copernicus.org/acp-15-5259-2015.pdf |
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| Zusammenfassung |
| Free-burning experimental fires were conducted in a wind tunnel to explore
the role of ignition type and thus fire spread mode on the resulting
emissions profile from combustion of fine (< 6 mm in diameter) Eucalyptus
litter fuels. Fires were burnt spreading with the wind (heading fire),
perpendicular to the wind (flanking fire) and against the wind (backing
fire). Greenhouse gas compounds (i.e. CO2, CH4 and N2O) and CO were
quantified using off-axis integrated-cavity-output spectroscopy.
Emissions factors calculated using a carbon mass balance technique (along with
statistical testing) showed that most of the carbon was emitted as CO2,
with heading fires emitting 17% more CO2 than flanking and 9.5% more
CO2 than backing fires, and about twice as much CO as flanking and backing
fires. Heading fires had less than half as much carbon remaining in
combustion residues. Statistically significant differences in CH4 and
N2O emissions factors were not found with respect to fire spread mode.
Emissions factors calculated per unit of dry fuel consumed showed that
combustion phase (i.e. flaming or smouldering) had a statistically
significant impact, with CO and N2O emissions increasing during
smouldering combustion and CO2 emissions decreasing. Findings on
the equivalence of different emissions factor reporting methods are discussed
along with the impact of our results for emissions accounting and potential
sampling biases associated with our work. The primary implication of this
study is that prescribed fire practices could be modified to mitigate
greenhouse gas emissions from forests by judicial use of ignition methods to
induce flanking and backing fires over heading fires. |
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