High-resolution modelling of contrails formed behind hydrogen-powered aircraft

Abstract

The study investigates how contrails from hydrogen-powered aircraft differ from those produced by conventional kerosene engines. Using high-resolution simulations with the EULAG-LCM large-eddy simulation model, the full lifecycle of contrails, from formation to their evolution into contrail-cirrus, is analyzed under various atmospheric conditions. Hydrogen combustion is assumed to emit more water vapour but fewer soot particles, resulting in fewer initial ice crystals and allowing contrails to form in warmer environments. The simulations show that hydrogen contrails generally have significantly lower total extinction than kerosene contrails, suggesting that hydrogen propulsion could substantially reduce the climate impact of individual contrails.