Global spatial and temporal distribution of vegetation fire as determined from satellite observations

Vegetation fires occur worldwide, all year round and inject enormous amount s of trace gases and particles into the atmosphere. Nonetheless, there is s till great uncertainty as to the global spatial and temporal distribution o f vegetation fires. Twenty one months of global, daily, daytime satellite d ata at 1 km resolution, from April 1992 to December 1993, were processed in order to determine the positions of active vegetation fires. Results from the first twelve months of the study period are presented here. This is the first time that such a global study has been carried out using a long time series data set and a single processing technique. The data set and result s discussed provide much improved information on the spatial variability an d the seasonality of vegetation fires. They will be of use in the global ma pping and modelling of emissions due to biomass burning as well as in the s tudy of the role of fire in land cover maintenance and change. We show that half of the fires detected were on the African continent and over 70% with in the tropical belt. Fires were detected in more than 6% of 1 km(2) pixels , over land, during the 12-month period and savanna grasslands accounted fo r over one third of this area.