The Geoengineering Model Intercomparison Project (GeoMIP) contribution to CMIP7 – description of new experimental protocols and preliminary results

The Geoengineering Model Intercomparison Project (GeoMIP) is a coordinated international model intercomparison effort with the aim of providing robust experimental protocols for simulations of various Solar Radiation Modification (SRM) methods. Through many iterations and discussions within the GeoMIP community, it has become clear that balancing simplicity, scientific realism, policy relevance and associated complexities is fundamental when designing modeling experiments. Such experiments must both diagnose areas of model agreement and disagreement through the lens of climate science and provide results useful for understanding the potential downstream impacts of SRM across different sectors. Here we present a suite of new climate model experiments designed for the Coupled Model Intercomparison Project Phase 7 (CMIP7), building on lessons learned from previous GeoMIP experiments, recent SRM research, and new simulations developed for CMIP7. We provide detailed experimental designs and their underlying rationale, including preliminary results from sensitivity analyses performed with CMIP6 models. Compared to previous GeoMIP iterations, we organize experiments into three categories: (i) Preparatory Experiments, designed to diagnose model responses and inform more complex experimental designs; (ii) Tier 1 experiments, the core simulations that all participating models should run; and (iii) Tier 2 experiments, which provide a flexible framework for exploring structural and scenario uncertainties under SRM, including the potential interaction with temporary overshoot scenarios and tipping elements dynamics. This framework encourages modeling groups to propose their own experiments building upon the Tier 1 backbone, enabling more targeted exploration while ensuring cross-model compatibility.

Authors

Institutions

Publication Details

Journal
Geoscientific model development
Published
2026-09-11
DOI
https://doi.org/10.5194/gmd-19-8469-2026
Primary Topic
Climate Change and Geoengineering
Type
article
Field-Weighted Citation Impact
0.00

Funders

Controls
|||
ALL TIME
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
article

The Geoengineering Model Intercomparison Project (GeoMIP) contribution to CMIP7 – description of new experimental protocols and preliminary results

Sandro Vattioni, Ben Kravitz, Juan Antonio Añel, Timofei Sukhodolov et al.
Geoscientific model development
Climate Change and Geoengineering
article

The Geoengineering Model Intercomparison Project (GeoMIP) contribution to CMIP7 – description of new experimental protocols and preliminary results

Sandro Vattioni, Ben Kravitz, Juan Antonio Añel, Timofei Sukhodolov, Daniele Visioni, Diego Villanueva, Alan Robock, Jim Haywood, Simone Tilmes, Ewa Bednarz, Andrin Jörimann, Colleen Golja, Haruki Hirasawa, Cindy Wang, Frédéric Bonou, Ryan Vella, Shingo Watanabe, Ulrike Niemeier, Matthew Henry, Walker Lee, Alistair Duffey, Paul Farron, Jack Chen, Kelsey Roberts, Michelle Simões Reboita, Masahiro Sugiyama
article en

Abstract

The Geoengineering Model Intercomparison Project (GeoMIP) is a coordinated international model intercomparison effort with the aim of providing robust experimental protocols for simulations of various Solar Radiation Modification (SRM) methods. Through many iterations and discussions within the GeoMIP community, it has become clear that balancing simplicity, scientific realism, policy relevance and associated complexities is fundamental when designing modeling experiments. Such experiments must both diagnose areas of model agreement and disagreement through the lens of climate science and provide results useful for understanding the potential downstream impacts of SRM across different sectors. Here we present a suite of new climate model experiments designed for the Coupled Model Intercomparison Project Phase 7 (CMIP7), building on lessons learned from previous GeoMIP experiments, recent SRM research, and new simulations developed for CMIP7. We provide detailed experimental designs and their underlying rationale, including preliminary results from sensitivity analyses performed with CMIP6 models. Compared to previous GeoMIP iterations, we organize experiments into three categories: (i) Preparatory Experiments, designed to diagnose model responses and inform more complex experimental designs; (ii) Tier 1 experiments, the core simulations that all participating models should run; and (iii) Tier 2 experiments, which provide a flexible framework for exploring structural and scenario uncertainties under SRM, including the potential interaction with temporary overshoot scenarios and tipping elements dynamics. This framework encourages modeling groups to propose their own experiments building upon the Tier 1 backbone, enabling more targeted exploration while ensuring cross-model compatibility.

Geoscientific model developmentVol. 19(17)
Rutgers, The State University of New Jersey (US), NSF National Center for Atmospheric Research (US), Japan Agency for Marine-Earth Science and Technology (JP), Cooperative Institute for Research in Environmental Sciences (US), University of Washington (US), Tohoku University (JP), Cornell University (US), University of Exeter (GB), ETH Zurich (CH), Institut National des Recherches Agricoles du Bénin (BJ), San Francisco Public Library (US), Indiana University Bloomington (US), Physikalisch-Meteorologisches Observatorium Davos (CH), NOAA Chemical Sciences Laboratory (US), NSF NCAR Climate and Global Dynamics Laboratory (US), Max Planck Institute for Meteorology (DE), Imperial College London (GB), Universidade de Vigo (ES), The University of Tokyo (JP), Universidade Federal de Itajubá (BR)
National Science Foundation, Japan Society for the Promotion of Science, NOAA Research, Development of Advanced Measurement and Analysis Systems
Climate action
Openalex Percentile: Top 14%
Climate Change and Geoengineering
DOIOpen Access PDFOpenAlex
AI Navigator

Ask Laika to Summarize, Analyze, and Connect papers live on the map.

Summarize Papers & Methodologies

Extract key findings, datasets, and comparative methods across publications.

Benchmark Rankings & Visual Analytics

Rank top research institutions, authors, funders, topics, and journals by Field-Weighted Citation Impact (FWCI) and paper volume with instant charts.

Connect Distant Disciplines

Bridge topological clusters on the map to find hidden collaborative intersections.