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6ka Experimental Design

Page in progress: this is not the final version! Use the discussion panel at the end of the page for comments

Boundary conditions

Summary of 6ka boundary conditions

PMIP3	Alternative solution
Orbital parameters	[ ecc = 0.018682 ] - [ obl = 24.105° ] - [ peri-180° = 0.87° ]
Date of vernal equinox	March 21 at noon
Trace gases	[ 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 sheets	Remnant Laurentide ice-sheet (provided)	Same as PI
Topography and coastlines	Modification of Hudson Bay coastlines (provided)	Same as PI

Please use the discussion panel to comment this table!

Vegetation

Depending on the complexity of the model used the vegetation will be either

computed by the model

prescribed to PI (some ESM may only compute vegetation phenology and carbon cycle)

prescribed to 6ka vegetation reconstructed from a combination of model output and data analyses (please use the map provided here)

Obtained from asynchronous coupling with a DVGM (Biome 4 model provided)

For Earth System Models with interactive carbone cycle

The simulations are forced by CO2 concentrations. Please use the same protocol 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 carefully using the following tables (6ka BP insolation 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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