Used to diagnose climate responses to the regionally heterogeneous evolution of anthropogenic aerosol emissions. Anthropogenic aerosols and aerosol precursor emissions (BC, OC, NH3, SO2) evolve as in piControl. All other forcings evolve as in historical. Intended for models without interactive chemistry. Models with interactive chemistry should run hist-piAQ instead. (Identical to hist-piAer in AerChemMIP phase 1.)

• Responsible activity: AerChemMIP
• Tier: 1
• MIP co-chair review: In progress see https://github.com/WCRP-CMIP/cmip7-guidance/issues/184

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-10-585-2017

Paired experiments¶

• hist-piAQ is the corresponding interactive-chemistry experiment for models that include interactive chemistry.

Experiment set up¶

Parent experiment and branching¶

The hist-piAer experiment branches from the piControl experiment (part of CMIP). The parent experiment's MIP era is CMIP7.

Branch from piControl at the same time as historical.

Output time axis¶

Your output time axis must start on 1850-01-01 and must end on 2021-12-31. You must perform the full simulation i.e. 172 simulation years.

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 hist-piAer experiment is a transient 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¶

For the following data, please see these other experiment pages:

• historical for land use, greenhouse gas concentrations, stratospheric aerosol forcing, ozone, nitrogen deposition, solar, aerosol optical properties, population density

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

For the following forcings, please use data from the specified experiments with the specified modifications.

• for anthropogenic emissions, use the forcings from historical but BC, OC, NH₃ and SO₂ emissions should be fixed to piControl simulation values
• for biomass burning emissions, use the forcings from historical but BC, OC, NH₃ and SO₂ emissions should be fixed to piControl simulation values

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.