MOTIF ICE-5G Data (v1.2)


Note: version 1.2 is the latest version of ICE-5G,

but PMIP2/MOTIF participants absolutely have to use the ICE-5G v1.1 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 1.2.

Differences between ICE-5G v1.2 and v1.1

The topography is now based on the ETOPO2 present-day topogragraphy data, and the ICE-5G v1.2 data files are only available at a 1x1 degree resolution (and 5x5 minutes for 0K and 21K).

Using ICE-5G in MOTIF

The PMIP2/MOTIF participants absolutely have to use the ICE-5G Version 1.1 version!

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 topography is based on a dataset for the present-day topography from the October 2001 NOAA/NGDC 2-Minute Gridded Global Relief Data (ETOPO2).

Data files

The data files are provided in netCDF format, and follow the CF (Climate and Forecast) metadata convention. The files are available every 500 years from 0K to 17K, and then every 1000 years. Each file contains a topography (orog), ice height (sftgit), and ice-mask (sftgif) variable.

Variable Long name Standard name Units
orog Surface Altitude surface_altitude m
sftgit Thickness of the Ice Sheet land_ice_thickness 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

1 degree
(773 Kb uncompressed
144-196 Kb compressed)
10 minutes
(27 Mb uncompressed)
0K X
( 4.4 Mb)
0.5 K X n/a
1.0 K X n/a
1.5 K X n/a
2.0 K X n/a
2.5 K X n/a
3.0 K X n/a
3.5 K X n/a
4.0 K X n/a
4.5 K X n/a
5.0 K X n/a
5.5 K X n/a
6.0 K X n/a
6.5 K X n/a
7.0 K X n/a
7.5 K X n/a
8.0 K X n/a
8.5 K X n/a
9.0 K X n/a
9.5 K X n/a
10.0 K X n/a
10.5 K X n/a
11.0 K X n/a
11.5 K X n/a
12.0 K X n/a
12.5 K X n/a
13.0 K X n/a
13.5 K X n/a
14.0 K X n/a
14.5 K X n/a
15.0 K X n/a
15.5 K X n/a
16.0 K X n/a
16.5 K X n/a
17.0 K X n/a
18.0 K X n/a
19.0 K X n/a
20.0 K X n/a
21K X
( 6.1 Mb)


The graphics available above for each time period, have been assembled into animated gif pictures: 0K to 21K, and 21 to 0K.

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! :)

Home Top Site Map @ Last updated \2007/04/17 09:37:46