A methodology to construct a reduced chemical scheme for 2D-3D photochemical models: Application to Saturn

► This study concerns photochemistry of hydrocarbons in the atmosphere of Saturn. ► We present a methodology to derive a very reduced chemical scheme that can be used in future 2D (or 3D) photochemical models. ► Our reduced scheme of 25 compounds and 46 reactions gives similar results, within the error bars of the model, than a 1D photochemical model.