Design for the mid-Holocene run

You will find on this page information about the experiment design for the PMIP4 mid-Holocene experiment.

Please make sure to read the 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:

Pascale Braconnot Scientific questions
Jean-Yves Peterschmitt Technical questions or missing data

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 doi:10.5194/gmd-2016-279

Specifications

PMIP4-CMIP6 specifications
PMIP4-CMIP6 name midHolocene
Astronomical parameters eccentricity = 0.018682
obliquity = 24.105°
perihelion-180° = 0.87°
Date of vernal equinox : March 21 at noon
Trace gases CO2 = 264.4 ppm
CH4 = 597 ppb
N2O = 262 ppb
CFC = 0
O3 = 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.
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 mid-Holocene 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 midHolocene and lig127k simulations are also expected to be relevant to analyses in SIMIP’s assessment of the role of sea-ice changes in climate changes and AerChemMIP’s assessment of the role of dust

Sensitivity experiments

Sensitivity to Prescribed Vegetation

Sensitivity to Prescribed Ice Sheets