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The basic principle is that we should strive to include all relevant transient forcings over this period if the functionality exists in the model, noting that conformability with the CMIP5 controls and 20th Century transient is crucial.
|Orbital parameters||Annually varying (850-1850)||1850 values or same Pre-Ind CMIP5 control|
|Table provided if not internally calculated||[ ecc = ] - [ obl = ° ] - [ peri-180° = ° ]|
|Date of vernal equinox||Mar 21 hr 0||same as CMIP5 control|
|Trace gases||Annually varying (850-1850)||constant at CMIP5 control levels|
|Table provided||[ CO2 = ppm ] - [ CH4 = ppb ] - [ N2O = ppb ] - [ CFC = ] - [ O3 = ]|
|Topography and coastlines|
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The following figure (click to get the full-size image) has been provided by Johann Jungclaus (MPI-M Hamburg)
Time series of TSI (Wm-2) from 800AD to 2000. For the COSMOS (MPI-M) Millennium simulations (black curve), a 11 year cycle was added for consistency over the entire period.