exp_design:lig127 [PMIP4]

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====== Design for the last Interglacial (at 127 ky BP) run======

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You will find on this page information about the experiment design for the PMIP4 [[.:lig127|last Interglacial (at 127 ky BP)]] experiment.

Please make sure to read the [[#Associated_publication|Associated publication]] before setting up your experiments or using the output data, and read any //how-to// sections associated with specific boundary conditions.

Get in touch with the following people if you have questions:


| [[ottobli@ucar.edu|Bette Otto-Bliesner]] | Scientific questions |
| [[Jean-Yves.Peterschmitt@lsce.ipsl.fr|Jean-Yves Peterschmitt]] | Technical questions or missing data|
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===== Associated publication =====

**The PMIP4 contribution to CMIP6 – Part 2: Two Interglacials, Scientific Objective and Experimental Design for Holocene and Last Interglacial Simulations**, Otto-Bliesner et al, GMD, under review [[https://dx.doi.org/10.5194/gmd-2016-279|doi:10.5194/gmd-2016-279]]

===== Specifications =====


^      ^PMIP4-CMIP6 specifications ^ 
| PMIP4-CMIP6 name | <wrap em>lig127k</wrap> |
| Astronomical parameters  | **eccentricity** = 0.039378 \\ **obliquity** = 24.04° \\  **perihelion-180°** = 275.41°  \\  **Date of vernal equinox**  :  March 21 at noon  |  
| Trace gases  | **CO<sub>2</sub>** = 275 ppm \\ **CH<sub>4</sub>** = 685 ppb \\ **N<sub>2</sub>O** = 255 ppb \\ **CFC** = 0 \\ **O<sub>3</sub>** = same as in CMIP6 piControl  | 
| Solar activity | Same as in CMIP6 piControl (TSI = 1360.747 W.m-2)  | 
| Ice sheets      | Same as in CMIP6 piControl  | 
| Topography and coastlines  | Same as in CMIP6 piControl  | 
| Volcanic activity | Same as in CMIP6 piControl  |
| Aerosols  | Modified sources, atmospheric concentrations or radiative forcing, depending on model complexity and model configuration used for DECK and historical experiments \\  cf. documenting papers: Otto-Bliesner et al, in prep and Kageyama et al, subm. \\ [[:data:aerosols|Access to data]]| 
| Vegetation     | Depending on model complexity and model configuration used for DECK and historical experiments: \\ Interactive vegetation **or** Interactive carbon cycle (LAI) **or** Prescribed to present-day values or lig127k values computed from off-line vegetation model \\ The methodology to represent vegetation should be the same as for the CMIP6 piControl simulation  \\  cf. documenting papers: Otto-Bliesner et al, in prep and Kageyama et al, subm. |

===== Collaboration =====

  * The PMIP4-CMIP6 **lig127k** simulation is being coordinated with [[http://www.climate-cryosphere.org/activities/targeted/ismip6|ISMIP6]]. The output from the lig127k simulation will be used by ISMIP6 to force standalone ice sheet experiments (//lastInterglacialforcedism//). This will increase our understanding of the sensitivity of the ice sheets, complementing the suite of standalone ISMIP6 ice sheet experiments.

  * The PMIP4-CMIP6 **midHolocene** and **lig127k** simulations are also expected to be relevant to analyses in [[http://www.climate-cryosphere.org/activities/groups/seaicemodeling/simip|SIMIP]]’s assessment of the role of sea-ice changes in climate changes and [[https://cmip.ucar.edu/aer-chem-mip|AerChemMIP]]’s assessment of the role of dust

===== Sensitivity experiments =====

==== Sensitivity to Prescribed Vegetation ====

==== Sensitivity to Prescribed Ice Sheets ====

==== Simulation to explore the effects of the H11 event ====