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6ka Experimental Design

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Boundary conditions

Summary of 6ka boundary conditions

PMIP3	Alternative solution
Orbital parameters	ecc=0.018682, obl=24.105 °, peri-180°= 0.87 °
date of the Vernal equinox	March 21 at Noon
Trace Gazes	CO2 = 280 ppm, CH4 = 650 ppb, N2O = 270 ppb, CFC = 0, O3 = same as PI
Aerosols	Same as PI
Solar constant	1365W/m2	As in PI
Vegetation	Interactive	See specific note below
Ice sheet	remnant Laurentide ice-sheet (provided)	Same as PI
Topography and coastline	Modification of the Hudson Bay (provided)	Same as PI

Vegetation Depending on the complexity of the model used the vegetation will be either
- computed by the model
- prescribed to PI
- prescribed to 6ka vegetation reconstructed from a combination of model output and data analyses (please use the map provided here)
- Obtained from asynschonous coupling with a DVGM (Biome 4 model provided )

For Earth System Model with interactive carbone cycle The simlations are force by the CO2 concentrations. Please use the same protocal as in CMIP5 to store the carbone fluxes and the variables needed for PCMIP (see list here)

Insolation Note that insolation should follows PMIP requirements. Please check it carefuly using the following tables

Initial conditions

PMIP3	Alternative solution
Initial conditions	branch off PI after adjustement	Same as in PI
Model spin up	Same as in PI

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