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Climate change is a challenge to society and to cope with requires assessment tools which are suitableto evaluate new technology options with respect to their impact on global climate.Here we present AirClim, a model which comprises a linearisation of atmospheric processesfrom the emission to radiative forcing, resulting in an estimate in near surface temperature change,which is presumed to be a reasonable indicator for climate change.The model is designed to be applicable to aircraft technology,i.e. the climate agents CO2, H2O, CH4 and O3 (latter two resulting from NOx-emissions)and contrails are taken into account.AirClim combines a number of precalculated atmospheric data with aircraft emission datato obtain the temporal evolution of atmospheric concentration changes, radiative forcing and temperature changes.These precalculated data are derived from25 steady-state simulations for the year 2050 with the climate-chemistry modelE39/C, prescribing normalised emissions of nitrogen oxides and water vapourat various atmospheric regions.The results show that strongest climate impacts (year 2100) from ozone changesoccur for emissions in the tropical uppertroposphere (60 mW/m2; 80 mK for 1 TgN/year emitted) and from methane changes from emissions in the middletropical troposphere (−2.7% change in methane lifetime; –30 mK per TgN/year).For short-lived species (e.g. ozone, water vapour, methane) individual perturbation lifetimes are deriveddepending on the region of emission.A comparison of this linearisation approach with results from a comprehensive climate-chemistry modelshows reasonable agreementwith respect to concentration changes, radiative forcing, and temperature changes.For example, the total impact of a supersonic fleet onradiative forcing (mainly water vapour) is reproduced within 10%.A wide range of application is demonstrated

AirClim: an efficient tool for climate evaluation of aircraft technology