Reply to Giglio et al. Comment on “Otón et al. Analysis of Trends in the FireCCI Global Long Term Burned Area Product (1982–2018). Fire 2021, 4, 74” (original) (raw)
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Analysis of Trends in the FireCCI Global Long Term Burned Area Product (1982–2018)
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We present an analysis of the spatio-temporal trends derived from long-term burned area (BA) data series. Two global BA products were included in our analysis, the FireCCI51 (2001–2019) and the FireCCILT11 (1982–2018) datasets. The former was generated from Moderate Resolution Imaging Spectroradiometer (MODIS) 250 m reflectance data, guided by 1 km active fires. The FireCCILT11 dataset was generated from Land Long-Term Data Record data (0.05°), which provides a consistent time series for Advanced Very High Resolution Radiometer images, acquired from the NOAA satellite series. FireCCILT11 is the longest time series of a BA product currently available, making it possible to carry out temporal analysis of long-term trends. Both products were developed under the FireCCI project of the European Space Agency. The two datasets were pre-processed to correct for temporal autocorrelation. Unburnable areas were removed and the lack of the FireCCILT11 data in 1994 was examined to evaluate the i...
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A new global burned area product for climate assessment of fire impacts
Aim This paper presents a new global burned area (BA) product developed within the framework of the European Space Agency's Climate Change Initiative (CCI) programme, along with a first assessment of its potentials for atmospheric and carbon cycle modelling. Innovation Methods are presented for generating a new global BA product, along with a comparison with existing BA products, in terms of BA extension, fire size and shapes and emissions derived from biomass burnings. Main conclusions Three years of the global BA product were produced, accounting for a total BA of between 360 and 380 Mha year 21. General omission and commission errors for BA were 0.76 and 0.64, but they decreased to 0.51 and 0.52, respectively, for sites with more than 10% BA. Intercomparison with other existing BA datasets found similar spatial and temporal trends, mainly with the BA included in the Global Fire Emissions Database (GFED4), although regional differences were found (particularly in the 2006 fires of eastern Europe). The simulated carbon emissions from biomass burning averaged 2.1 Pg C year 21 .
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Vegetation fires are an important process in the Earth system. Fire intensity locally impacts fuel consumption, damage to the vegetation, chemical composition of fire emissions but also how fires spread across landscapes. It has been observed that fire occurrence, defined as the frequency of active fires detected by the MODIS sensor, is related to intensity with a hump-shaped empirical relation meaning that occurrence reaches a maximum at intermediate fire intensity. Raw burned area products obtained from remote-sensing can not discriminate between ignition and propagation processes. Here we use the newly delivered global FRY database, which provides fire patch functional traits including fire patch size from satellite observation, tTo go beyond burned area, and to test if fire size is driven by fire intensity at global scale as expected from empirical fire spread models, we used the newly delivered global FRY database which provides fire patch functional traits based on satellite o...
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Global Scale Inventory of the Area Burnt in the Year 2000. The GBA2000 Dataset
2002
Over large regions of the globe, emissions from biomass burning are known to contribute significantly to the injection of pollutants into the atmosphere. Greenhouse gases and carbonaceous aerosols, emitted by the vegetation fires, impact on the radiation balance at the surface, on the acidification of precipitation, on air quality and human health. Vegetation fires act also as a direct disturbance to the terrestrial ecosystems, which play a role as sources or sinks of carbon at local, regional and global scales. For instance, biomass burning contributes up to 40%, 16% and 43% of the total emissions of anthropogenic origin for carbon dioxide, methane and carbon monoxide respectively [1]. Last but not least, vegetation fires are closely related to some of the degradation processes, which affect the terrestrial resources in certain global ecosystems.
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