PMIP 2 ICE-5G Data (v1.1)


Note: ICE-5G v1.1 has been superseded by ICE-5G v1.2,

but the PMIP2/MOTIF participants absolutely have to use the 1.1 version!


What is ICE-5G (VM2)?

ICE-5G is a new global ice sheet reconstruction produced by W.R Peltier of the Department of Physics in the University of Toronto, Canada.

The model differs significantly from the previous version (ICE-4G and see also PMIP newsletter 3) at all Northern Hemisphere locations that were glaciated at Last Glacial Maximum. These locations include all of northwestern Europe/Eurasia, the British Isles, Greenland and the North American continent.

The VM2 designation refers to the radial variation of viscosity in the sub-lithospheric mantle.

The files available here pertain to ICE-5G (VM2) Version 1.1.

Using ICE-5G in PMIP 2

The data files available on this page, that have to be used for PMIP 2, are from the Version 1.1 of ICE-5G.

To implement this boundary condition in your model, please follow carefully the directions given in the old PMIP newsletter 3.

Credits and references

All papers that employ the ICE-5G reconstruction should reference the following publication in which the complete model is first described:

Peltier, W.R., Global glacial isostasy and the surface of the ice-age Earth: the ICE-5G (VM2) model and GRACE. Annual Review of Earth and Planetary Sciences, May 2004, Vol 32, 111-149.

Prior publications describing the detailed analysis which has led to the modifications of the ice-sheet topography in the individual geographic regions are as follows:

The 5-minute topography is based on a dataset for the present-day topography from the January 1994 NOAA/NGDC Digital Terrain Models (Terrainbase) collection. Note that it has been recently superceded by ETOPO2 which has 2-minute resolution.

Note: details about the Gravity Recovery and Climate Experiment can be found on the GRACE web site.

Data files

The data files are provided in netCDF format, and follow the CF (Climate and Forecast) metadata convention. Each file contains a topography (orog) and an ice-mask (sftgif) variable.

Variable Long name Standard name Units
orog Surface Altitude surface_altitude m
sftgif Fraction of Grid Cell Covered with Glacier land_ice_area_fraction %

If you have technical questions about the data files, please get in touch with Rosemarie Drummond and Jean-Yves Peterschmitt.

  Quick look Resolution
1 degree
(519 Kb uncompressed)
5 minutes
(72 Mb uncompressed)
0K X
(130 Kb)
(14 Mb)
21K X
(181 Kb)
(21 Mb)

ICE-5G, ICE5G or 'ICE 5G'?

For people who care about things such as consistency and try to be friendly with web indexing sites and robots, let us say that we should only use ICE-5G (see the '-' between ICE and 5G?)when we are referring to this global ice sheet reconstruction! :)

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