Max-Planck Institute Earth System Model (MPI-ESM) couples atmosphere model ECHAM, ocean model MPIOM and land-surface model JSBACH. The main ESM components are complemented with atmospheric aerosol-chemistry HAMMOZ model and ocean biogeochemistry model HAMOCC.

eSTICC has focused development to aerosol-chemistry and land-surface models. eSTICC developed HAMMOZ-SALSA to include a volatility basis set (VBS) model for describing volatility of precursors, as well as partitioning between aerosol and gas-phase. In addition, mechanisms of of secondary organic aerosol formation were included, including isoprene-derived products and anthropogenic precursors. eSTICC further developed the nucleation and growth mechanisms in MPI-ESM, e.g. by implementing a new sulfuric acid nucleation parameterization.

In JSBACH, eSTICC teams focused on optimization of vegetation parameters and developing wetland emissions of CH4 and CO2. eSTICC participated development of HIMMELI, a model for methane formation and emission from peatlands. HIMMELI has been implemented in JSBACH, which allows global assessment of methame emissions from wetlands. The parameters in HIMMELI were further optimized with MCMC methods.

The general description of MPI-ESM can be found at Junglaus et al. (2018):