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//Go to =>// [ [[pmip3:design:pi:final|PI]] ] - [ **6ka** ] - [ [[pmip3:design:21k:final|21ka]] ] - [ [[pmip3:design:lm:final|LM]] ] 

====== 6ka Experimental Design ======
===== Boundary conditions =====

==== Summary of 6ka boundary conditions ====


^      ^   PMIP3/CMIP5  ^ 
|  Orbital parameters  |  [ **ecc** = 0.018682 ] - [ **obl** = 24.105° ] - [ **peri-180°** = 0.87° ]  |  
|  Date of vernal equinox  |  March 21 at noon  | |
|  Trace gases  |  [ **CO<sub>2</sub>** = 280 ppm ] - [ **CH<sub>4</sub>** = 650 ppb ] - [ **N<sub>2</sub>O** = 270 ppb ] - [ **CFC** = 0 ] - [ **O<sub>3</sub>** = same as PI ]  | 
|  Aerosols  |  Same as PI  | 
|  Solar constant  |   Same as PI  |
|  Vegetation     |  prescribed or interactive as in CMIP5 PI  | 
|  Ice sheets      |    Same as PI *   |
|  Topography and coastlines  |   Same as PI *  |

* Sensitivity experiments will be proposed as part of a working group to test the uncertainties due to the remnant ice-sheet. If you are interested to participate to this working group contact Pascale Braconnot 



==== Vegetation ====

The vegetation should be treated as in the CMIP5 PI experiment. The reason is that in CMIP5 we test the version of the model used for future climate projections. Since OA and ESM models will be considered, depending on the model used the vegetation will be 

  * prescribed to PI (which means both vegetation types and LAI are prescribed )
  * Prescribed to PI with interactive LAI (models with interactive carbone cycle, but no vegetation dynamics)
  * Computed by the model (models with dynamic vegetation) 

There are still questions concerning the possibility to have a 6ka reconstructed vegetation from a combination of model output and data analyses that could be used for sensitivity experiments. Please tell if you are interested by such a map and what would be the best variables (pft?) that should be provided (see comment from B. Otto-Bliesner in the discussion pannel).  

==== 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 ([[http://pmip2.lsce.ipsl.fr/design/tables/inso_tables_6k.shtml|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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