Modular Earth System Model Emulator with spatially Resolved output

## MESMER: spatially resolved Earth System Model emulations

MESMER is a Modular Earth System Model Emulator with spatially Resolved output, which stochastically creates Earth System Model-specific spatio-temporally correlated climate variable field realizations at a negligible computational cost.

In combination with a global mean temperature emulator, MESMER can account for all three major sources of climate change projection uncertainty at the local scale: (i) internal variability uncertainty, i.e., unforced natural climate variability; (ii) forced climate response uncertainty, i.e., the Earth’s system response to forced natural changes (solar and volcanic) and human influences (greenhouse gas and aerosol emissions, land use changes etc.); and (iii) emission uncertainty, i.e., uncertainty in the emission pathway humans decide to follow. An interface between MESMER and global mean temperature emulators can be found at https://github.com/MESMER-group/mesmer-openscmrunner.

MESMER is under active development both scientifically and technically. Future work will increase its user friendliness and extend its emulation capabilities to include additional emulation methods and target climate variables.

## Citing MESMER

Scientific publications using MESMER should cite the following publication:

Beusch, L., Gudmundsson, L., and Seneviratne, S. I.: Emulating Earth system model temperatures with MESMER: from global mean temperature trajectories to grid-point-level realizations on land, Earth Syst. Dynam., 11, 139–159, https://doi.org/10.5194/esd-11-139-2020, 2020.

If MESMER is used to emulate multiple emission pathways and/or in combination with a global mean emulator, the following publication should additionally be cited:

Beusch, L., Nicholls, Z., Gudmundsson, L., Hauser, M., Meinshausen M., and Seneviratne, S. I.: From emission scenarios to spatially resolved projections with a chain of computationally efficient emulators: MAGICC (v 7.5.1) - MESMER (v 0.8.1) coupling, Geosci. Model Dev. Discuss. [preprint], https://doi.org/10.5194/gmd-2021-252, in review, 2021.

Copyright (c) 2021 ETH Zurich, MESMER contributors listed in AUTHORS.

MESMER is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 3 or (at your option) any later version.

MESMER is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with MESMER. If not, see https://www.gnu.org/licenses/.

The full list of code contributors can be found in AUTHORS or on github.com/contributors

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