Detection and attribution (D&A) studies typically require unforced control simulations and historical
simulations including all major anthropogenic and natural forcings.
Such simulations will be carried out as part of the CMIP6 DECK and the
CMIP6 historical simulation. In addition D&A studies require
simulations covering the historical period driven by individual
forcings or subsets of forcings only: these will be undertaken as part of DAMIP. Key novel features of the DAMIP experimental design following D&A-relevant simulations in CMIP5 are:
- new historical simulations of aerosols-only, stratospheric-ozone-only, CO2-only, solar-only,
and volcanic-only forcing, facilitating an improved estimation of the
climate response to individual forcing;
- future single forcing
experiments, allowing observationally-constrained
projections of future climate change;
- an experimental design
which allows models with and without coupled atmospheric chemistry to
be compared on an equal footing.
Tier 1 experiments
Name of experiment
|
Description
(forcing agents perturbed)
|
Period |
CMIP6 historical simulations and ScenarioMIP SSP2-4.5
|
Enlarging ensemble size of the CMIP6 historical simulations (1850–2014) and the SSP2-4.5 simulations of ScenarioMIP (2015–2020). (As historical: WMGHGs, BC, OC, SO2, SO4, NOx, NH3, CO, NMVOC, nitrogen deposition, ozone, stratospheric aerosols, solar irradiance, land use).
|
1850-2020 |
| hist-nat |
Natural-only historical simulations (solar irradiance, stratospheric aerosol)
|
1850-2020 |
| hist-GHG |
Well-mixed greenhouse-gas-only historical simulations (WMGHGs)
|
1850-2020 |
hist-aer
|
Anthropogenic-aerosol-only historical simulations (BC, OC, SO2, SO4, NOx, NH3, CO, NMVOC)
|
1850-2020 |
Tier 2 experiments
| Name of experiment |
Description
(forcing agents perturbed) |
Period
|
| ssp245-GHG |
Extension of at least one hist-GHG simulation through the 21st century using the SSP2-4.5 greenhouse gas concentrations (WMGHGs)
|
2021-2100
|
hist-stratO3
|
Stratospheric-ozone-only historical simulations (stratospheric ozone)
|
1850-2020
|
| ssp245-stratO3 |
Extension of at least one hist-stratO3 simulation through the 21st century using SSP2-4.5 stratospheric ozone concentrations (stratospheric ozone)
|
2021-2100
|
Tier 3 experiments
| Name of experiment |
Description
(forcing agents perturbed) |
Period
|
hist-sol
|
Solar-only historical simulations (solar irradiance)
|
1850-2020
|
hist-volc
|
Volcanic-only historical simulations (stratospheric aerosol)
|
1850-2020
|
hist-CO2
|
CO2-only historical simulations (CO2)
|
1850-2020
|
ssp245-aer
|
Extension of at least one hist-aer simulation through the 21st century using SSP2-4.5 tropospheric aerosol concentrations/emissions (BC, OC, SO2, SO4, NOx, NH3, CO, NMVOC)
|
2021-2100
|
ssp245-nat
|
Extension of at least one hist-nat simulation through the 21st century using SSP2-4.5 solar and volcanic forcing (solar irradiance, stratospheric aerosol)
|
2021-2100
|
hist-all-aer2
|
historical with alternate estimates of anthropogenic aerosol emissions/concentrations (As historical: WMGHGs, BC, OC, SO2, SO4, NOx, NH3, CO, NMVOC, nitrogen deposition, ozone, stratospheric aerosols, solar irradiance, land use)
|
1850-2020
|
hist-all-nat2
|
historical with alternate estimates of solar and volcanic forcing (as historical:
WMGHGs, BC, OC, SO2, SO4, NOx, NH3, CO, NMVOC, nitrogen deposition, ozone, stratospheric aerosols, solar irradiance, land use)
|
1850-2020
|
|
|
