The MIT Earth System Model (MESM) comprises coupled sub-models of physical, dynamical and chemical processes in the atmosphere, land and freshwater systems, ocean and cryosphere.
It is used to calculate global and regional environmental responses to human activity and natural processes. The MESM draws on scientific knowledge combined with land, air, water and space-based measurements, and accounts for uncertainties about how the Earth system functions.
The model consists of three main components—land, ocean and atmosphere—and represents the processes that shape each component’s evolution and the interactions among these components, essentially serving as an Earth simulator. This allows researchers to calculate the likely environmental impacts of human activities simulated in the MIT Economic Projection and Policy Analysis (EPPA) model, and feed those impacts back into the EPPA model in order to assess their economic and other implications.
The MESM is highly flexible, modular and computationally efficient, so we can run large ensembles of multi-century runs (varying uncertain climate model properties as identified by our research), and include different levels of model detail within MESM components as appropriate for specific studies.
The source code for the MESM is available by request for non-commercial research and educational purposes. Contact firstname.lastname@example.org for details. A working paper describing and evaluating the MESM is available here.