Datasets
Paleo-topography data
ICE-6G --
Users of the data sets that define the ICE-6G(VM5a) model and that have been produced by employing it to make predictions of geodetically and geologically observable signals in the Earth system are requested to reference the following publications in which this model was originally presented:
Argus, D.F., Peltier, W.R., Drummond, R. and Moore, A.W. - The Antarctica component of postglacial rebound model ICE-6G_C (VM5a) based upon GPS positioning, exposure age dating of ice thicknesses, and relative sea level histories. Geophys. J. Int., 198, 537-563, 2014.
Peltier, W.R., Argus, D.F. and Drummond, R. - Space geodesy constrains ice-age terminal deglaciation: the ICE-6G_C (VM5a) model. J. Geophys. Res.-Solid Earth, 85 page manuscript with 29 figures, in press, 2014.
Files are available for the following times (Ka)
26.0, 25.0, 24.0, 23.0, 22.0, 21.0,
20.5, 20.0, 19.5, 19.0, 18.5, 18.0, 17.5, 17.0, 16.5, 16.0,
15.5, 15.0, 14.5, 14.0, 13.5, 13.0, 12.5, 12.0, 11.5, 11.0,
10.5, 10.0, _9.5, _9.0, _8.5, _8.0, _7.5, _7.0, _6.5, _6.0,
_5.5, _5.0, _4.5, _4.0, _3.5, _3.0, _2.5, _2.0, _1.5, _1.0, _0.5, _0.0
Each file contains information for points on a 1x1 degree global grid.
Information pertaining to the input ice-model is given by values of the ice thickness (stgit) and the ice-area fraction (stgif).
Predictions obtained from the model are: topography (Topo), topography difference from present (Topo_Diff), Surface altitude (orog) and the land area fraction (sftlf).
Topography includes bathymetry and for an ice-shelf, orog will give the ice surface whereas Topo will give the ocean depth.
Other prediction available are:
Stokes trend coefficients: Stokes_trend_256.txt.gz
Rate of change of sea-level on a 1x1 grid: dsea.1grid.nc
Rate of radial displacement (UP) on a 1x1 grid: drad.1grid.nc
Rate of change of sea level at PSMSL locations: drsl.PSMSL.txt
Rate of radial displacement (UP) at PSMSL locations: drad.PSMSL.txt
ICE-5G --
NetCDF files for ICE-5G (VM2 L90) model version 1.2. The underlying present-day topography is ETOPO2 instead of Terrainbase. Files are available archived with tar and gzip or zip (size is given before compression). Each file contains data on Surface Altitude, Thickness of the Ice Sheet, and the Ice-mask. The values are point-values at the associated grid-point. The Ice-mask is either 100 if there is ice at that point, or zero if there is no ice. The following data files are available:
.zip, .gz: 0 KBP, 10 min resolution (27 Mb)
.zip, .gz: 21 KBP, 10 min resolution (27 Mb)
.zip, .gz: 0 KBP, 1 deg resolution (773 Kb)
.zip, .gz: 21 KBP, 1 deg resolution (773 Kb)
.zip, .tar.gz: 0-21 KBP inclusive, 1 deg resolution (39 files, 30 Mb)
Users of the data sets that define the ICE-5G(VM2) model and that have been produced by employing it to make predictions of geodetically and geologically observable signals in the Earth system are requested to reference the following publication in which this model was originally presented:
W.R. Peltier, 2004. Global Glacial Isostasy and the Surface of the Ice-Age Earth: The ICE-5G (VM2) Model and GRACE, Ann. Rev. Earth and Planet. Sci., 32, 111-149.
Follow this link to get the full text of the paper in PDF format.
Ice thickness information that was previously available from the SBL website is available: 26-0Ka, 122-27Ka: This is given for points on an order 256 Gaussian grid. [Note that ICE-5G does not have realistic ice-margins prior to LGM]
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:
North America -- W.R. Peltier, Global Glacial Isostatic Adjustment: Paleogeodetic and Space-Geodetic Tests of the ICE-4G (VM2) Model, J. Quat. Sci., 17, 491-510, 2002
Northwestern Europe/Eurasia -- The new results for this region are described for the first time in Peltier (2004) and rely in large part on the ice-margins obtained in the QUEEN project sponsored by the European Science Foundation.
Users of the ICE-5G data sets whose focus is upon a particular geographic region are requested to reference the most relevant of the above regionally focussed analyses as well as the Peltier (2004) publication.
Predictions of the rate of RSL rise due to GIA effect at PSMSL locations
Predictions for ICE-5G (VM2 L90) model (version 1.3) for PSMSL tidegauge sites (in ASCII format). (Note: version 1.3f was here for a short time in error. It is an experimental version, not a fixed one.)
The files were updated Aug 13,2012 using the latest PSMSL station list- no change has been made to ICE-5G since March 2012.
Files contain values of the rates of relative sealevel rise and of vertical motion of the solid earth in mm/yr Each shows the coordinates of PSMSL stations followed by 3 columns showing rates-of-change:
(1) a value using the predicted difference in rsl for the last 250yrs
(2) a value using the predicted difference in rsl for the coming 250yrs
(3) a value centred on "now" using the predicted rsl at now +/- 250yrs
Obviously (3) is the average of (1) and (2) and we suggest you use this number. The other two can give some idea of how smooth the predicted variation is (but is definitely not to be called an error-bar!)
AN ERROR WAS DISCOVERED IN March 2012 AND THE FILES HAVE BEEN REPLACED WITH CORRECTED VERSIONS.
There are 4 netcdf files giving values (also corrected) on a 1x1 degree grid:
rate of sealevel rise
rate of vertical motion
rate of change of geoid
horizontal velocity components
Details of the earth model VM2_L90
Users of the data sets that define the ICE-5G(VM2) model and that have been produced by employing it to make predictions of geodetically and geologically observable signals in the Earth system are requested to reference the following publication in which this model was originally presented:
W.R. Peltier, 2004. Global Glacial Isostasy and the Surface of the Ice-Age Earth: The ICE-5G (VM2) Model and GRACE, Ann. Rev. Earth and Planet. Sci., 32, 111-149.
Follow this link to get the full text of the paper in PDF format.
