The tools used for these emission calculations are methods
available from literature or developed in-house that correlate
the emitted amount of any species to the individual
characteristic engine operating parameter(s). As reference data
to adjust these correlation methods sea level static measurement
data from certification tests published in the ICAO data base
for all engine types are used. These calculations deliver
information how much of each species is emitted by individual
flights at a certain time and (three-dimensional) location into
the atmosphere. Combining and analysing this information with a
number of aircraft movements from a traffic data base gives
results like the inventory of soot emissions of the global air
traffic of March 1992, as shown in figure 1. Inventories like
this one are essential input for modelling the influence of
human activities on the earth's climate. The latest tools
available deliver inventories with much higher spatial and
temporal resolution (figure 2).