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King's Research Portal King’s Research Portal DOI: 10.5194/acpd-14-6311-2014 Document Version Publisher's PDF, also known as Version of record Link to publication record in King's Research Portal Citation for published version (APA): Smith, T. E. L., Paton-walsh, C., Meyer, C. P., Cook, G. D., Maier, S. W., Russell-smith, J., Wooster, M. J., & Yates, C. P. (2014). New emission factors for Australian vegetation fires measured using open-path Fourier transform infrared spectroscopy: Part 2: Australian tropical savanna fires. Atmospheric Chemistry and Physics, 14(5), 6311-6360. [N/A]. https://doi.org/10.5194/acpd-14-6311-2014 Citing this paper Please note that where the full-text provided on King's Research Portal is the Author Accepted Manuscript or Post-Print version this may differ from the final Published version. If citing, it is advised that you check and use the publisher's definitive version for pagination, volume/issue, and date of publication details. 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Download date: 24. Sep. 2021 Atmos. Chem. Phys., 14, 11335–11352, 2014 www.atmos-chem-phys.net/14/11335/2014/ doi:10.5194/acp-14-11335-2014 © Author(s) 2014. CC Attribution 3.0 License. New emission factors for Australian vegetation fires measured using open-path Fourier transform infrared spectroscopy – Part 2: Australian tropical savanna fires T. E. L. Smith1, C. Paton-Walsh2, C. P. Meyer3, G. D. Cook4, S. W. Maier5, J. Russell-Smith5, M. J. Wooster1, and C. P. Yates5 1King’s College London, Earth and Environmental Dynamics Research Group, Department of Geography, London, UK 2Centre for Atmospheric Chemistry, School of Chemistry, University of Wollongong, Wollongong, New South Wales, Australia 3CSIRO Marine and Atmospheric Sciences, PMB 1, Aspendale, Victoria, Australia 4CSIRO Ecosystem Sciences Sustainable Agriculture Flagship, PMB 44, Winnellie, Northern Territory, Australia 5Charles Darwin University, Research Institute for the Environment and Livelihoods, Darwin, Northern Territory, Australia Correspondence to: T. E. L. Smith ([email protected]) Received: 30 December 2013 – Published in Atmos. Chem. Phys. Discuss.: 11 March 2014 Revised: 16 September 2014 – Accepted: 17 September 2014 – Published: 29 October 2014 Abstract. Savanna fires contribute approximately 40–50 % stantially between different savanna vegetation assemblages; of total global annual biomass burning carbon emissions. Re- with a majority of this variation being mirrored by variations cent comparisons of emission factors from different savanna in the modified combustion efficiency (MCE) of different regions have highlighted the need for a regional approach to vegetation classes. We conclude that a significant majority emission factor development, and better assessment of the of the variation in the emission factor for trace gases can be drivers of the temporal and spatial variation in emission fac- explained by MCE, irrespective of vegetation class, as illus- tors. This paper describes the results of open-path Fourier trated by variations in the calculated methane emission factor transform infrared (OP-FTIR) spectroscopic field measure- for different vegetation classes using data sub-set by different ments at 21 fires occurring in the tropical savannas of the combustion efficiencies. Therefore, the selection of emission Northern Territory, Australia, within different vegetation as- factors for emissions modelling purposes need not necessar- semblages and at different stages of the dry season. Spec- ily require detailed fuel type information, if data on MCE tra of infrared light passing through a long (22–70 m) open- (e.g. from future spaceborne total column measurements) or path through ground-level smoke released from these fires a correlated variable were available. were collected using an infrared lamp and a field-portable From measurements at 21 fires, we recommend the FTIR system. The IR spectra were used to retrieve the mole following emission factors for Australian tropical sa- fractions of 14 different gases present within the smoke, and vanna fires (in grams of gas emitted per kilogram of these measurements used to calculate the emission ratios and dry fuel burned), which are our mean measured values: emission factors of the various gases emitted by the burn- 1674 ± 56 g kg−1 of carbon dioxide; 87 ± 33 g kg−1 ing. Only a handful of previous emission factor measures are of carbon monoxide; 2.1 ± 1.2 g kg−1 of methane; available specifically for the tropical savannas of Australia 0.11 ± 0.04 g kg−1 of acetylene; 0.49 ± 0.22 g kg−1 of and here we present the first reported emission factors for ethylene; 0.08 ± 0.05 g kg−1 of ethane; 1.57 ± 0.44 g kg−1 methanol, acetic acid, and formic acid for this biome. Given of formaldehyde; 1.06 ± 0.87 g kg−1 of methanol; the relatively large sample size, it was possible to study the 1.54 ± 0.64 g kg−1 of acetic acid; 0.16 ± 0.07 g kg−1 of potential causes of the within-biome variation of the derived formic acid; 0.53 ± 0.31 g kg−1 of hydrogen cyanide; and emission factors. We find that the emission factors vary sub- 0.70 ± 0.36 g kg−1 of ammonia. In a companion paper, Published by Copernicus Publications on behalf of the European Geosciences Union. 11336 T. E. L. Smith et al.: New emission factors for Australian savanna fires similar techniques are used to characterise the emissions search has been on Africa (e.g. Bertschi et al., 2003a; Yokel- from Australian temperate forest fires. son et al., 2003; Sinha et al., 2003; Keane et al., 2006). Only Hurst et al. (1994a, b), and Shirai et al. (2003) have published emission factors from Australian savannas, with 1 Introduction most measurements made using airborne campaigns. Most recently, Meyer et al. (2012) have published emission factors Estimates of mean annual carbon emissions from worldwide for methane (CH4) and nitrous oxide (N2O) from Australian savanna and grassland fires amount to ∼ 1 Pg C per year savannas using ground-based sampling methods. (2000–2009), or approximately a mean of 40–50 % of total Careful interpretation of data collected from these vari- global annual biomass burning carbon emissions (van der ous methods is required to ensure the accurate characterisa- Werf et al., 2010). In terms of the Australian savanna, the tion of fire-averaged emissions (Akagi et al., 2011). Beyond direct gross carbon emissions from fires have a similar, if these methodological complications are the factors that lead not greater, magnitude than those from Australian fossil fuel to the natural variability of emissions (e.g. interactions be- combustion (Haverd et al., 2013). However, in tropical Aus- tween meteorology, seasonality and combustion efficiency). tralia, net carbon emissions from fires are considered neg- As the recent study by van Leeuwen and van der Werf (2011) ligible as the carbon lost to burning is approximately bal- shows, within-biome temporal and spatial variations in emis- anced by the carbon sequestered during regrowth (Haverd et sion factors are substantial, and despite their attempts to al., 2013). Akagi et al. (2011) present summaries of emis- explain these using relationships between emission factors sion factors (EFs) that can be used to convert estimates of and a number of environmental variables (tree cover den- total biomass (or carbon) consumed in fires into estimates of sity, vegetation greenness, temperature, precipitation, length individual trace gas species release. Emissions of non-CO2 of dry season), correlations between CO, CH4 and CO2 EFs, gases from savanna fires, such as nitrous oxide and methane, and modified combustion efficiency (MCE), were rather low, whose emissions are not sequestered by regrowth, comprise with environmental variables explaining 33, 38, 19, and 34 % 2–4 % of total Australian national greenhouse gas emissions of the variation in the reported emissions metrics, respec- (DCCEE, 2010), and are included in the accountable green- tively. Van Leeuwen and van der Werf (2011) posit some po- house gas inventory. At state or territory scales, pyrogenic tential reasons for the poor explanation of within-biome vari- emissions of CO2, CH4, and N2O can be far more signif- ability, including different measurement techniques for EFs, icant, with emissions from fires comprising nearly 50 % of assumptions used to weight EFs by the amount of flaming the Northern Territory’s accountable carbon emissions (DC- and smouldering combustion and uncertainties in the envi- CEE, 2010). ronmental variables themselves. Explaining the large natural A clear understanding of the emissions characteristics of variability of EFs that is so pronounced in the findings of Ak- Australia’s tropical savannas is important for regional emis- agi et al. (2011) remains an important challenge for biomass sions modelling and for associated greenhouse gas account- burning emissions science. ing schemes. As with the fire regimes of other savanna re- Through measurements of a large number of fires dur- gions, that in Australia’s tropical savanna is heavily influ- ing multiple campaigns at different stages of tropical Aus- enced by human fire use and fire management (Garde, 2009; tralia’s dry season, this work aims to expand the current Cook et al., 2010).
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