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Three dimensional models that account for chemistry are useful tools topredict the chemical composition of (exo)planet and brown dwarf atmospheres andinterpret observations of future telescopes. Recent Juno observations of theNH3 tropospheric distribution in Jupiter also indicate that 3D chemicalmodelling may be necessary to constrain the deep composition of the giantplanets of the Solar System. However, due to the high computational cost ofchemistry calculations, 3D chemical modelling has so far been limited. Asolution to include chemical kinetics in a 3D model is to use a reducedchemical scheme. In this view, we have developed a reduced scheme containing 30species and 181 reversible reactions, from the full chemical scheme of Venot etal. 2012. This scheme reproduces accurately the vertical profiles of theobservable species (H2O, CH4, CO, CO2, NH3, and HCN) and has a large range ofvalidity. It can be used to study all kind of warm atmospheres, except hotC-rich ones, which contains a high amount of C2H2. It can be used in 1D models,for fast computations, but also in 3D models for hot giant (exo)planet andbrown dwarf atmospheres.

A reduced chemical scheme for modelling warm to hot hydrogen-dominated atmospheres