Spin-up simulation. Used to get the model into a state of approximate radiative equilibrium before starting the piControl simulation.

• Responsible activity: CMIP
• Tier: 3
• MIP co-chair review: In progress see https://github.com/WCRP-CMIP/cmip7-guidance/issues/183

This page is intended to help with implementation. If you notice something that is unclear, please raise an issue.

For the full background of the experiment, please see the following URLs:

• https://doi.org/10.5194/gmd-18-6671-2025

Paired experiments¶

• esm-piControl-spinup is the emissions-driven counterpart to this concentration-driven experiment.

Experiment set up¶

Parent experiment and branching¶

piControl-spinup does not have a parent experiment.

Output time axis¶

You are free to start and end the time axis of your outputs at whatever time you like (e.g. starting at year 1, or 1850, or year 500).

Minimum ensemble size¶

Only one ensemble member is required.

Forcings¶

The following information will help you identify the forcings to use. However, we can't define every single detail because there can be lots of subjective steps between the raw forcings data and model inputs (e.g. interpolation, re-aggregation, supplementation with other information). If further guidance would be helpful, please raise an issue.

General headlines¶

The piControl-spinup experiment is a fixed forcings experiment.

Data¶

Here we make a distinction between data that is described on other experiment pages, data that is described on other experiment pages with modifications you have to make yourself, data available via ESGF's input4MIPs project and data distributed via other channels.

Data described on other experiment pages¶

All data is described on the piControl experiment page.

Data described on other experiment pages with modifications you have to make¶

No data described on other experiment pages requires modifications by you. Please see the other data sub-sections for details of the forcings data to use for this experiment.

Data available via input4MIPs¶

No input4MIPs-based data is described specifically on this page. Please see the other data sub-sections for details of the forcings data to use for this experiment.

Data not available via input4MIPs¶

No data that is not input4MIPs-based is described specifically on this page. Please see the other data sub-sections for details of the forcings data to use for this experiment.