Fossil Fuel and Biomass Burning Black Carbon Emissions from the Global Emissions Inventory Activity (GEIA)

The fossil fuel emissions are compiled from 23 fuel types of which coal,
lignite brown and diesel form the majority of the emissions. The data are
representative of 1984 emissions. The data is given in tonnes per 1 degree
grid.

The biomass burning emissions are compiled from various sources of
deforestation amounts and estimates of savanna burning. The method used to
calculate these emissions is presented in Cooke and Wilson (1996).

The seasonality of the biomass emissions is a combination of a modified version
of Hao et al. (1991) and some assumptions for extra-tropical forest fires. In
addition seasonality as estimated by satellite observations are used to modify
the seasonality of vegetation fires in Africa. This modification is discussed
in Cooke et al. (1996) The modifications to the Hao et al. data is as follows:

1) The same dry season is assumed as Hao et. al. but the fraction of biomass
burnt in each of the five months is modified so that the fractions are now 5%,
25%, 40%, 25% and 5% for the appropriate five months of the dry season. A
sharper peak has been observed in the seasonality of the fire season (Cooke et
al. 1996) so this would appear to be The forest fires in extra-tropical regions
has been assumed to occur in the summer-time.

2) For Africa, satellite observations over a five year period have been used to
estimate the seasonality of vegetation fires. Where fires have been detected
the seasonality of Hao et al. (1991) has been replaced by the seasonality as
estimated by the satellite data.