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).