Biomass burning fuel consumption dynamics in the tropics and subtropics assessed from satellite

• Published in: Biogeosciences 2016-06, Vol.13 (12), p.3717-3734
• Main Authors: Andela, Niels, van der Werf, Guido R, Kaiser, Johannes W, van Leeuwen, Thijs T, Wooster, Martin J, Lehmann, Caroline E. R
• Format: Article
• Language: English
• Subjects: Accumulation; Agricultural management; Agriculture; Air quality; Airborne remote sensing; Airborne sensing; Area; Atmospheric models; Biogeochemistry; Biomass; Biomass burning; Burning; Burning rate; Deforestation; Dynamics; Ecosystem dynamics; Emission; Emissions; Energy use; Estimates; Fires; Fuel consumption; Fuels; Grasslands; Imaging techniques; Infrared imaging; Instruments; Land cover; Land management; Landscape; Modelling; MODIS; Power consumption; Remote sensing; Satellites; Savannahs; Spatial distribution; Spectroradiometers; Tropical climate; Tropical environments; Vegetation; Vegetation type
• ISSN: 1726-4189; 1726-4170; 1726-4189
• DOI: 10.5194/bg-13-3717-2016

Landscape fires occur on a large scale in (sub)tropical savannas and grasslands, affecting ecosystem dynamics, regional air quality and concentrations of atmospheric trace gasses. Fuel consumption per unit of area burned is an important but poorly constrained parameter in fire emission modelling. We combined satellite-derived burned area with fire radiative power (FRP) data to derive fuel consumption estimates for land cover types with low tree cover in South America, Sub-Saharan Africa, and Australia. We developed a new approach to estimate fuel consumption, based on FRP data from the polar-orbiting Moderate Resolution Imaging Spectroradiometer (MODIS) and the geostationary Spinning Enhanced Visible and Infrared Imager (SEVIRI) in combination with MODIS burned-area estimates. The fuel consumption estimates based on the geostationary and polar-orbiting instruments showed good agreement in terms of spatial patterns. We used field measurements of fuel consumption to constrain our results, but the large variation in fuel consumption in both space and time complicated this comparison and absolute fuel consumption estimates remained more uncertain. Spatial patterns in fuel consumption could be partly explained by vegetation productivity and fire return periods. In South America, most fires occurred in savannas with relatively long fire return periods, resulting in comparatively high fuel consumption as opposed to the more frequently burning savannas in Sub-Saharan Africa. Strikingly, we found the infrequently burning interior of Australia to have higher fuel consumption than the more productive but frequently burning savannas in northern Australia. Vegetation type also played an important role in explaining the distribution of fuel consumption, by affecting both fuel build-up rates and fire return periods. Hummock grasslands, which were responsible for a large share of Australian biomass burning, showed larger fuel build-up rates than equally productive grasslands in Africa, although this effect might have been partially driven by the presence of grazers in Africa or differences in landscape management. Finally, land management in the form of deforestation and agriculture also considerably affected fuel consumption regionally. We conclude that combining FRP and burned-area estimates, calibrated against field measurements, is a promising approach in deriving quantitative estimates of fuel consumption. Satellite-derived fuel consumption estimates may both challen