Comparative study of Swedish emission factors for aviation with the IPCC default emission factors

The IPCC guidelines recommend that if national emission factors (EFs) are used to estimate emissions from aviation, they should be compared with the IPCC default EFs. This study has aimed at making such comparison. The estimates of emissions related aviation from the governmental airports in Sweden are based on information from the Swedish Civil Aviation Administration (SCAA) and the Swedish Defence Research Agency (FOI). They use two models – HARP and PIANO – to derive and calculate emissions. HARP is used to estimate national Times in Mode (TIM) and PIANO is used to calculate the actual emissions.

Results from this study elucidate that the PIANO model generates significantly lower fuel consumption and emissions compared to the IPCC defaults, due to the considerably shorter TIMs estimated by the HARP model. Comparisons on fuel consumption and aircraft basis show good agreement for CO2 and SO2, whereas CH4, NMVOC and CO are about 20 % lower, and NOX slightly higher for the PIANO model.  

Sweden uses CORINAIR’s default EFs for N2O and its default ratio for separating HC into CH4 and NMVOC. In order to be consistent with the IPCC guidelines we recommend that Sweden apply the IPCC standards instead when estimating these emissions.