Aggregated Carbon cycle, atmospheric chemistry and climate model (ACC2): description of forward and inverse mode

The Aggregated Carbon Cycle, Atmospheric Chemistry, and Climate model (ACC2) describes major physical-biogeochemical processes in the Earth system on a global-annual-mean basis.The starting point of the development of ACC2 is the ICLIPS Climate Model (ICM) (Bruckner et al., 2003).The novel aspect of ACC2 is the implementation of an inversion scheme, complementary to the inversion approach deriving probability densities for several climate properties (e.g.Forest et al., 2002;