NOx and SO2 Emission Data Bases for Atmospheric Chemistry Studies from the Lawrence Livermore National Laboratory (LLNL)

Global data bases of trace gas emissions to the atmosphere have been
compiled for use in atmospheric chemistry studies. The data bases are
global emissions of nitrogen oxides (NOx) and sulfur dioxide
(SO2). These compounds are important for their role as contributors to
acid wet and dry precipitation. NOx takes part in the photochemical
production of tropospheric ozone (O3). The major sources of NOx
include fossil fuel burning, lightning, emissions from the biosphere,
stratospheric injections, and biomass burning. SO2 sources are
dominated by fossil fuel burning, industry (ore smelting), and
volcanic eruptions. The fossil fuel sources for both NOx and SO2 are
the largest contributor.

The resolution of the data bases is a 1 degree by 1 degree grid based
on Matthews (1983) and Matthews and Fung (1987). Three databases have
been provided. The first is an inventory of nitrogen oxides (NOx)
emissions from fossil fuel combustion. The second is an inventory of
emissions of SO2 also from fossil fuel combustion. These data bases
are described in Dignon (1991). The third data base is a global
inventory of NOx emissions from terrestrial biomass burning and is
given seasonally for the globe (Dignon and Penner, 1991; Dignon et al,
1991) for the months of January and July.

The units of emission for the inventories are given as the mass in
metric tons of nitrogen (N) for the NOx inventories and metric tons of
sulfur (S) for the SO2 inventory for each 1x1 degree grid. The
inventory for NOx from biomass burning is for January, which
represents cumulated emissions for the months from October to March;
and for July, which represent cumulated emissions for the months from
April to September.