Design for the LGM run
You will find on this page information about the experiment design for the PMIP4 Last Glacial Maximum experiment.
Please make sure to read the Associated publications 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:
| Masa Kageyama | Scientific questions |
| Jean-Yves Peterschmitt | Technical questions or missing data |
Associated publication
The PMIP4 contribution to CMIP6 – Part 4: Scientific objectives and experimental design of the PMIP4-CMIP6 Last Glacial Maximum experiments and PMIP4 sensitivity experiments, Kageyama, M., Albani, S., Braconnot, P., Harrison, S. P., Hopcroft, P. O., Ivanovic, R. F., Lambert, F., Marti, O., Peltier, W. R., Peterschmitt, J.-Y., Roche, D. M., Tarasov, L., Zhang, X., Brady, E. C., Haywood, A. M., LeGrande, A. N., Lunt, D. J., Mahowald, N. M., Mikolajewicz, U., Nisancioglu, K. H., Otto-Bliesner, B. L., Renssen, H., Tomas, R. A., Zhang, Q., Abe-Ouchi, A., Bartlein, P. J., Cao, J., Li, Q., Lohmann, G., Ohgaito, R., Shi, X., Volodin, E., Yoshida, K., Zhang, X., and Zheng, W., Geosci. Model Dev., 10, 4035-4055, doi:10.5194/gmd-10-4035-2017, 2017.
Supplement (Kageyama et al, GMD, 2017)
Specifications
| PMIP4-CMIP6 specifications | |
|---|---|
| PMIP4-CMIP6 name | lgm |
| Astronomical parameters | eccentricity = 0.018994 obliquity = 22.949° perihelion-180° = 114.42° Date of vernal equinox : March 21 at noon |
| Trace gases | CO2 = 190 ppm CH4 = 375 ppb N2O = 200 ppb CFC = 0 O3 = same as in CMIP6 piControl |
| Solar activity | Same as in CMIP6 piControl |
| Ice sheets | Modified Access to data |
| Topography and coastlines | Modified Access to data |
| 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: Kageyama 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: Kageyama et al, in prep and Kageyama et al, subm. |
Supplementary material
The scripts used for generating the LGM boundary conditions for the IPSL model, following the steps detailed in the Kageyama et al paper, can be dowloaded from LSCE. Get in touch with Jean-Yves Peterschmitt if you need to access this material.