References

ACP

Atmospheric Chemistry and Physics

ACP

Atmos. Chem. Phys.

1680-7324

Copernicus Publications

Göttingen, Germany

10.5194/acp-14-11335-2014

New emission factors for Australian vegetation fires measured using open-path Fourier transform infrared spectroscopy – Part 2: Australian tropical savanna fires

Smith

T. E. L.

https://orcid.org/0000-0001-6022-5314

¹ Paton-Walsh

https://orcid.org/0000-0003-1156-4138

² Meyer

C. P.

³ Cook

G. D.

⁴ Maier

S. W.

⁵ Russell-Smith

⁵ Wooster

M. J.

¹ Yates

C. P.

⁵

King's College London, Earth and Environmental Dynamics Research Group, Department of Geography, London, UK

Centre for Atmospheric Chemistry, School of Chemistry, University of Wollongong, Wollongong, New South Wales, Australia

CSIRO Marine and Atmospheric Sciences, PMB 1, Aspendale, Victoria, Australia

CSIRO Ecosystem Sciences Sustainable Agriculture Flagship, PMB 44, Winnellie, Northern Territory, Australia

Charles Darwin University, Research Institute for the Environment and Livelihoods, Darwin, Northern Territory, Australia

29 10 2014

14 20 11335 11352

2014

This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/

This article is available from https://acp.copernicus.org/articles/14/11335/2014/acp-14-11335-2014.html

The full text article is available as a PDF file from https://acp.copernicus.org/articles/14/11335/2014/acp-14-11335-2014.pdf

Savanna fires contribute approximately 40–50% of total global annual biomass burning carbon emissions. Recent comparisons of emission factors from different savanna regions have highlighted the need for a regional approach to emission factor development, and better assessment of the drivers of the temporal and spatial variation in emission factors. This paper describes the results of open-path Fourier transform infrared (OP-FTIR) spectroscopic field measurements at 21 fires occurring in the tropical savannas of the Northern~Territory, Australia, within different vegetation assemblages and at different stages of the dry season. Spectra of infrared light passing through a long (22–70 m) open-path through ground-level smoke released from these fires were collected using an infrared lamp and a field-portable FTIR system. The IR spectra were used to retrieve the mole fractions of 14 different gases present within the smoke, and these measurements used to calculate the emission ratios and emission factors of the various gases emitted by the burning. Only a handful of previous emission factor measures are available specifically for the tropical savannas of Australia and here we present the first reported emission factors for methanol, acetic acid, and formic acid for this biome. Given the relatively large sample size, it was possible to study the potential causes of the within-biome variation of the derived emission factors. We find that the emission factors vary substantially between different savanna vegetation assemblages; with a majority of this variation being mirrored by variations in the modified combustion efficiency (MCE) of different vegetation classes. We conclude that a significant majority of the variation in the emission factor for trace gases can be explained by MCE, irrespective of vegetation class, as illustrated by variations in the calculated methane emission factor for different vegetation classes using data sub-set by different combustion efficiencies. Therefore, the selection of emission factors for emissions modelling purposes need not necessarily require detailed fuel type information, if data on MCE (e.g. from future spaceborne total column measurements) or a correlated variable were available. From measurements at 21 fires, we recommend the following emission factors for Australian tropical savanna fires (in grams of gas emitted per kilogram of dry fuel burned), which are our mean measured values: 1674 ± 56 g kg−1 of carbon dioxide; 87 ± 33 g kg−1 of carbon monoxide; 2.1 ± 1.2 g kg−1 of methane; 0.11 ± 0.04 g kg−1 of acetylene; 0.49 ± 0.22 g kg−1 of ethylene; 0.08 ± 0.05 g kg−1 of ethane; 1.57 ± 0.44 g kg−1 of formaldehyde; 1.06 ± 0.87 g kg−1 of methanol; 1.54 ± 0.64 g kg−1 of acetic acid; 0.16 ± 0.07 g kg−1 of formic acid; 0.53 ± 0.31 g kg−1 of hydrogen cyanide; and 0.70 ± 0.36 g kg−1 of ammonia. In a companion paper, similar techniques are used to characterise the emissions from Australian temperate forest fires.

References 1

Akagi, S. K., Yokelson, R. J., Wiedinmyer, C., Alvarado, M. J., Reid, J. S., Karl, T., Crounse, J. D., and Wennberg, P. O.: Emission factors for open and domestic biomass burning for use in atmospheric models, Atmos. Chem. Phys., 11, 4039–4072, <a href="http://dx.doi.org/10.5194/acp-11-4039-2011">https://doi.org/10.5194/acp-11-4039-2011</a>, 2011.

Akagi, S. K., Burling, I. R., Mendoza, A., Johnson, T. J., Cameron, M., Griffith, D. W. T., Paton-Walsh, C., Weise, D. R., Reardon, J., and Yokelson, R. J.: Field measurements of trace gases emitted by prescribed fires in southeastern US pine forests using an open-path FTIR system, Atmos. Chem. Phys., 14, 199–215, <a href="http://dx.doi.org/10.5194/acp-14-199-2014">https://doi.org/10.5194/acp-14-199-2014</a>, 2014.

Andreae, M. O. and Merlet, P.: Emission of trace gases and aerosols from biomass burning, Global Biogeochem. Cy., 15, 955–966, 2001.

Bertschi, I. T., Yokelson, R. J., Ward, D. E., Christian, T. J., and Hao, W. M.: Trace gas emissions from the production and use of domestic biofuels in Zambia measured by open-path Fourier transform infrared spectroscopy, J. Geophys. Res., 108, 8469, <a href="http://dx.doi.org/10.1029/2002JD002158">https://doi.org/10.1029/2002JD002158</a>, 2003a.

Bertschi , I., Yokelson, R. J., Ward, D. E., Babbitt, R. E., Susott, R. A., Goode, J. G., and Hao, W. M.: Trace gas and particle emissions from fires in large diameter and belowground biomass fuels, J. Geophys. Res., 108, 8472, <a href="http://dx.doi.org/10.1029/2002JD002100">https://doi.org/10.1029/2002JD002100</a>, 2003b.

Christian, C. S., Stewart, G. A., Noakes, L. C., and Blake, S. T.: General Report on Survey of Katherine-Darwin Region, 1946. Land Research Series No. 1. Commonwealth Scientific and Industrial Research Organization, Australia, Melbourne, 1953.

Cook, G. D. and Meyer, C. P.: Fire, fuels and greenhouse gases, in: Culture, ecology and economy of savanna fire management in Northern Australia: rekindling the Wurrk tradition, edited by: Russell-Smith, J., Whitehead, P., and Cooke, P., 85–164, CSIRO Publishing, Collingwood, Victoria, 2009.

Cook, G. D., Williams, R. J., Stokes, C. J., Hutley, L. B., Ash, A. J., and Richards, A. E.: Managing sources and sinks of greenhouse gases in Australia's rangelands and tropical savannas, Regional Ecology and Management, 63, 137–146, 2010.

DCCEE: Australian national greenhouse accounts: National Inventory Report 2008, Vol. 1, Rep., 279 pp., Department of Climate Change and Energy Efficiency, Commonwealth of Australia, Canberra, 2010.

Garde, M.: The language of fire: seasonality, resources and landscape burning on the Arnhem Land Plateau, in: Culture, ecology and economy of savanna fire management in Northern Australia: rekindling the Wurrk tradition, edited by: Russell-Smith, J., Whitehead, P., and Cooke, P., 85–164, CSIRO Publishing, Collingwood, Victoria, 2009.

Griffith, D. W. T.: Synthetic calibration and quantitative analysis of gas-phase FTIR spectra, Appl. Spectrosc., 50, 59–70, 1996.

Griffith, D. W. T., Mankin, W. G., Coffey, M. T., Ward, D. E., and Riebau, A.: FTIR remote sensing of biomass burning emissions of CO2, CO, CH4, CH2O, NO, NO2, NH3 and N2O, in: Global Biomass Burning, edited by: Levine, J. S., The MIT Press, Cambridge, Massachusetts, 230–239, 1991.

Haverd, V., Raupach, M. R., Briggs, P. R., J. G. Canadell., Davis, S. J., Law, R. M., Meyer, C. P., Peters, G. P., Pickett-Heaps, C., and Sherman, B.: The Australian terrestrial carbon budget, Biogeosciences, 10, 851–869, <a href="http://dx.doi.org/10.5194/bg-10-851-2013">https://doi.org/10.5194/bg-10-851-2013</a>, 2013.

Hurst, D. F., Griffith, D. W. T., and Cook, G. D.: Trace gas emissions from biomass burning in tropical Australian savannas, J. Geophys. Res., 99, 16441–16456, 1994a.

Hurst, D. F., Griffith, D. W. T., Carras, J. N., Williams, D. J., and Fraser, P. J.: Measurements of trace gases emitted by Australian savanna fires during the 1990 dry season, J. Atmos. Chem., 18, 33–56, 1994b.

Keane, W. C., Lobert, J. M., Crutzen, P. J., Maben, J. R., Scharffe, D. H., Landmann, T., Hély, C., and Brain, C.: Emissions of major gaseous and particulate species during experimental burns of southern African biomass, J. Geophys. Res., 111, D04301, <a href="http://dx.doi.org/10.1029/2005JD006319">https://doi.org/10.1029/2005JD006319</a>, 2006.

Lobert, J. M. and Warnatz, J.: Emissions from the combustion process in vegetation, in: Fire in the Environment: The Ecological, Atmospheric, and Climatic Importance of Vegetation Fires, edited by: Crutzen, P. J. and Goldammer, J. G., 15–37, John Wiley, New York, 1993.

Lobert, J. M., Scharffe, D. H., Hao, W. M., Kuhlbusch, T. A., Seuwen, R., Warneck, P., and Crutzen, P. J.: (Experimental evaluation of biomass burning emissions: Nitrogen and carbon containing compounds, in: Global Biomass Burning: Atmospheric, Climatic and Biospheric Implications, edited by: Levine, J. S., MIT Press, Cambridge, Massachusetts, 1991.

Lynch, B. T. and Wilson, P. L.: Land systems of Arnhem Land, Rep., 168 pp., Natural Resources Division, Northern Territory Department of Lands, Planning and Environment, Palmerston, 1998.

Meyer, C. P., Cook, G. D., Reisen, F., Smith, T. E. L., Tattaris, M., Russell-Smith, J., Maier, S. W., Yates, C. P., and Wooster, M. J.: Direct measurements of the seasonality of emission factors from savanna fires in northern Australia, J. Geophys. Res., 117, D20305, <a href="http://dx.doi.org/10.1029/2012JD017671">https://doi.org/10.1029/2012JD017671</a>, 2012.

Müller, U., Kurte, R., and Heise, H. M.: Investigation of photometric errors in FTIR-spectra obtained in open-path monitoring, J. Mol. Struct., 482–483, 539–544, 1999.

Parks Australia: Terrestrial Ecoregions in Australia, available at: <a href="http://www.environment.gov.au/topics/land/nrs/science-maps-and-data/australias-bioregions-ibra/australias-ecoregions">http://www.environment.gov.au/topics/land/nrs/science-maps-and-data/australias-bioregions-ibra/australias-ecoregions</a> (last access: 10 September 2014), 2010.

Paton-Walsh, C., Deutscher, N. M., Griffith, D. W. T., Forgan, B. W., Wilson, S. R., Jones, N. B., and Edwards, D. P.: Trace gas emissions from savanna fires in northern Australia, J. Geophys. Res., 115, D16314, <a href="http://dx.doi.org/10.1029/2009JD013309">https://doi.org/10.1029/2009JD013309</a>, 2010.

Paton-Walsh, C., Smith, T. E. L., Young, E. L., Griffith, D. W. T., and Guérette, É.-A.: New emission factors for Australian vegetation fires measured using open-path Fourier transform infrared spectroscopy – Part 1: Methods and Australian temperate forest fires, Atmos. Chem. Phys., 14, 11313–11333, <a href="http://dx.doi.org/10.5194/acp-14-11313-2014">https://doi.org/10.5194/acp-14-11313-2014</a>, 2014.

Ross, A. N., Wooster, M. J., Boesch, H., and Parker, R.: First satellite measurements of carbon dioxide and methane emission ratios in wildfire plumes, Geophys. Res. Lett., 40, 4098–4102, 2013.

Russell-Smith, J., Yates, C. P., Whitehead, P. J., Smith, R., Craig, R., Allan, G. E., Thackway, R., Frakes, I., Cridland, S., Meyer, C. P., and Gill, A. M.: Bushfires `down under': patterns and implications of contemporary Australian landscape burning, Int. J. Wildland Fire, 16, 361–377, 2007.

Russell-Smith, J., Murphy, B. P., Meyer, M. C. P., Cook, G. D., Maier, S., Edwards, A. C., Schatz, J., and Brocklehurst, P.: Improving estimates of savanna burning emissions for greenhouse accounting in northern Australia: limitations, challenges, applications, Int. J. Wildland Fire, 18, 1–18, 2009.

Shirai, T., Blake, D. R., Meinardi, S., Rowland, F. S., Russell-Smith, J., Edwards, A., Kondo, Y., Koike, M., Kita, K., Machida, T., Takegawa, N., Nishi, N., Kawakami, S., and Ogawa, T.: Emission estimates of selected volatile organic compounds from tropical savanna burning in northern Australia, J. Geophys. Res., 18, D38406, <a href="http://dx.doi.org/10.1029/2001JD000841">https://doi.org/10.1029/2001JD000841</a>, 2003.

Sinha, P., Hobbs, P. V., Yokelson, R. J., Bertschi, I. T., Blake, D. R., Simpson, I. J., Gao, S., Kirchstetter, T. W., and Novakov, T.: Emissions of trace gases and particles from savanna fires in southern Africa, J. Geophys. Res., 108, 8487, <a href="http://dx.doi.org/10.1029/2002JD002325">https://doi.org/10.1029/2002JD002325</a>, 2003.

Smith, T. E. L., Wooster, M. J., Tattaris, M., and Griffith, D. W. T.: Absolute accuracy and sensitivity analysis of OP-FTIR retrievals of CO2, CH4 and CO over concentrations representative of "clean air" and "polluted plumes", Atmos. Meas. Tech., 4, 97–116, <a href="http://dx.doi.org/10.5194/amt-4-97-2011">https://doi.org/10.5194/amt-4-97-2011</a>, 2011.

van der Werf, G. R., Randerson, J. T., Giglio, L., Collatz, G. J., Mu, M., Kasibhatla, P. S., Morton, D. C., DeFries, R. S., Jin, Y., and van Leeuwen, T. T.: Global fire emissions and the contribution of deforestation, savanna, forest, agricultural, and peat fires (1997–2009), Atmos. Chem. Phys., 10, 11707–11735, <a href="http://dx.doi.org/10.5194/acp-10-11707-2010">https://doi.org/10.5194/acp-10-11707-2010</a>, 2010.

van Leeuwen, T. T. and van der Werf, G. R.: Spatial and temporal variability in the ratio of trace gases emitted from biomass burning, Atmos. Chem. Phys., 11, 3611–3629, <a href="http://dx.doi.org/10.5194/acp-11-3611-2011">https://doi.org/10.5194/acp-11-3611-2011</a>, 2011.

Wooster, M. J., Freeborn, P. H., Archibald, S., Oppenheimer, C., Roberts, G. J., Smith, T. E. L., Govender, N., Burton, M., and Palumbo, I.: Field determination of biomass burning emission ratios and factors via open-path FTIR spectroscopy and fire radiative power assessment: headfire, backfire and residual smouldering combustion in African savannahs, Atmos. Chem. Phys., 11, 11591–11615, <a href="http://dx.doi.org/10.5194/acp-11-11591-2011">https://doi.org/10.5194/acp-11-11591-2011</a>, 2011.

Yokelson, R. J., Griffith, D. W. T., and Ward, D. E.: Open-path Fourier transform infrared studies of large-scale laboratory fires, J. Geophys. Res., 101, 21067–21080, 1996.

Yokelson, R. J, Bertschi, I. T., Christian, T. J., Hobbs, P. V., Ward, D. E., and Hao, W. M.: Trace gas measurements in nascent, aged, and cloud-processed smoke from african savanna fires by airborne Fourier transform infrared spectroscopy. (A-FTIR), J. Geophys. Res., 108, 8478, <a href="http://dx.doi.org/10.1029/2002JD002322">https://doi.org/10.1029/2002JD002322</a>, 2003.