Within the Coupled Model Intercomparison Project, the term DECK stands for Diagnostics, Evaluation, and Characterization of Kilma. As noted in the table below, for CMIP7, the DECK experiments have been expanded to include the Historical experiments as well as three fixed pre-industrial Sea Surface Temperature experiments similar to those in CMIP6 RFMIP.

For the source data for this page, see the CMIP AR7 Fast Track experiment viewer on the CMIP7 web page as well as [1, Table 1] and [2, Table A1].

Experiment short name	In CMIP6	Description	Anthropogenic Forcing	Volcanic Forcing	Solar Forcing	Start	End
1pctCO2	DECK [2,A1.4]	CO2 prescribed to increase at 1% per year	Same as piControl except CO2 prescribed to increase at 1% per year	Same as piControl	Same as piControl	1 (branching from year 101 or later of piControl)	150
abrupt-4xCO2	DECK [2,A1.3]	CO2 prescribed to 4 times piControl	Same as piControl except CO2 prescribed to 4 times piControl	Same as piControl	Same as piControl	1 (branching from year 101 or later of piControl)	150+ (300)
amip	DECK [2,A1.1]	Observed SSTs and SICs prescribed	Time-varying	Time-varying	Time-varying	1979	2021
esm-historical	Historical [2,A2]	Same as historical but using CO2 concentration calculated from emission	Same as historical but with prescribed CO2 emission and calculated CO2 concentration	Same as historical	Same as historical	Same as historical	Same as historical
esm-piControl	DECK [2,A1.2]	Same as piControl but using CO2 concentration calculated from emission	CO2 emission from both fossil fuel use and land use change prescribed to be 0	Same as piControl	Same as piControl	Same as piControl	Same as piControl
historical	Historical [2,A2]	Simulation of the recent past	Time-varying	Time-varying	Time-varying	1850	2021
piClim-4xCO2	RFMIP [3,Table 1]	Same as piClim-control except CO2 prescribed to 4 times piControl	Same as piControl except CO2 prescribed to 4 times piControl	Same as piControl	Same as piControl	1	30
piClim-anthro	RFMIP [3,Table 1]	Same as piClim-control except present-day anthropogenic forcing	All 2021, CO2 prescribed concentration	Same as piControl	Same as piControl	1	30
piClim-control	RFMIP [3,Table 1]	Preindustrial with prescribed SST and SIC	All 1850, CO2 prescribed concentration	Same as piControl	Same as piControl	1	30
piControl	DECK [2,A1.2]	Coupled atmosphere- ocean preindustrial control	All 1850, prescribed CO2 concentration	Fixed mean radiative forcing matching historical	Fixed mean value matching first two solar cycles of historical	1	400+

The column Anthropogenic Forcing above refers to all 7 of the following historical forcings in [1, Table 2], including some natural forcings:

Forcing dataset	Short description
Anthropogenic short-lived climate forcer (SLCF) and CO2 emissions	Gridded monthly mean historical emission estimates by sector, and fuel for anthropogenic aerosol and precursor compounds, and CO2, CH4 and N2O.
Open biomass burning emissions	Gridded monthly estimates of open biomass burning emissions (forests, grasslands, agricultural waste burning on fields, peatlands).
Land use	Gridded annual estimates of the fractional land-use patterns, underlying land-use transitions, and key agricultural management information.
Greenhouse gas historical concentrations	Consolidated data sets of historical atmospheric (volume) mixing ratios of 43 greenhouse gases and ozone depleting substances.
Ozone concentrations	TBD, expected: Gridded monthly mean 3-D ozone mixing ratios.
Nitrogen deposition	TBD, expected: Gridded monthly mean 2-D nitrogen deposition flux.
Aerosol optical properties/MACv2-SP	Anthropogenic aerosol optical properties for a number of key plumes based on the MACv2-SP parameterization

References

[1] Dunne, John Patrick, et al. "An evolving Coupled Model Intercomparison Project phase 7 (CMIP7) and Fast Track in support of future climate assessment." EGUsphere 2024 (2024): 1-51.

[2] Eyring, Veronika, et al. "Overview of the Coupled Model Intercomparison Project Phase 6 (CMIP6) experimental design and organization." Geoscientific Model Development 9.5 (2016): 1937-1958.

[3] Pincus, Robert, Piers M. Forster, and Bjorn Stevens. "The radiative forcing model intercomparison project (RFMIP): Experimental protocol for CMIP6." Geoscientific Model Development 9.9 (2016): 3447-3460.