Atmos. Chem. Phys. Discuss., 10, 22047-22092, 2010
www.atmos-chem-phys-discuss.net/10/22047/2010/
doi:10.5194/acpd-10-22047-2010
© Author(s) 2010. This work is distributed
under the Creative Commons Attribution 3.0 License.
Review Status
This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Atmospheric emissions from vegetation fires in Portugal (1990–2008): estimates, uncertainty analysis, and sensitivity analysis
I. M. D. Rosa1,*, J. M. C. Pereira1, and S. Tarantola2
1Technical University of Lisbon, School of Agriculture, Center for Forest Studies, Tapada da Ajuda 1349-017 Lisboa, Portugal
2Joint Research Centre of the European Commission, Ispra, Italy
*now at: Faculty of Natural Sciences, Division of Biology, Imperial College of London, Silwood Park Campus, UK

Abstract. Atmospheric emissions from wildfires in Portugal were estimated yearly over the period 1990–2008 using Landsat-based burnt area maps and land cover maps, national forest inventory data, biometric models, and literature review data. Emissions were calculated as the product of area burnt, biomass loading per unit area, combustion factor, and emission factor, using land cover specific values for all variables. Uncertainty associated with each input variable was quantified with a probability density function or a standard deviation value. Uncertainty and sensitivity analysis of estimates were performed with Monte Carlo and variance decomposition techniques. Area burnt varied almost 50-fold during the study period, from about 9000 ha in 2008 to 440 000 ha in 2003. Emissions reach maximum and minimum in the same years, with CO2eq values of 159 and 5655 Gg for 2008 and 2003, respectively. Emission factors, and the combustion factor for shrubs were identified as the variables with higher impact on model output variance. There is a very strong correlation between area burnt and emissions, allowing for accurate emissions estimates once area burnt is quantified. Pyrogenic emissions were compared against those from various economy sectors and found to represent 1% to 9% of the total.

Citation: Rosa, I. M. D., Pereira, J. M. C., and Tarantola, S.: Atmospheric emissions from vegetation fires in Portugal (1990–2008): estimates, uncertainty analysis, and sensitivity analysis, Atmos. Chem. Phys. Discuss., 10, 22047-22092, doi:10.5194/acpd-10-22047-2010, 2010.
 
Search ACPD
Discussion Paper
    XML
    Citation
    Final Revised Paper
    Share