Present Day Antarctica

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Contents

Grid Details

These are 5km resolution, NetCDF files of Antarctica gathered from various data sources and interpolated, when necessary, onto the same grid using polar stereographic projection. Data download is available below as well as a change log which describes updates included in the current version of the data.

A table of the Data Sources.


Antartica: Ice surface velocity draped over ice surface elevation.
Antartica: Ice surface velocity draped over ice surface elevation.


Mapping for Antarctica: Polar Stereographic(WGS84)
Standard Parallel    71.0
Latitude of Projection Origin   -90.0
False Easting    0.0
False Northing    0.0
Straight Vertical Longitude from Pole    0.0
Lower Left Corner X-Value   -2800 km
Lower Left Corner Y-Value   -2800 km

The Improved BEDMAP Data

The Antarctica data set contains the BEDMAP1_plus data field for topography. The areas of improved data are highlighted in the figure below. This data is courtesy of Hamish Pritchard and BAS. The new grid is a result of merging BEDMAP1, an AGASEA-BBAS-based grid from Texas University, and bathymetry grids by Nitsche(LDEO) and Tara Dean(BAS).

The new BEDMAP1_plus data for topography.
The new BEDMAP1_plus data for topography.

Antarctica Data Set Visuals

Antartica: The Topography, Surface Elevation and Ice Thickness fields from the data set for Antarctica.

Antartica: .

Antartica: .

Data Download

The recent changes data sets can be found in this change log.

Antarctica with Ice Shelves The data file contains the following fields in NetCDF format :
  • Latitude,
  • Longitude,
  • Mean Annual Surface Temperature (Comiso et al 2000 ),
  • Ice Thickness; Ice Thickness of Grounded Ice is calculated from surface elevation and topography. Ice shelf thickness was provided by J.A. Griggs and J.L. Bamber, July 2009, who warn that "This is a beta data product and should not be treated as a final product." The ice shelf thickness data should be referenced as "A new ice thickness dataset for the Antarctic ice shelves derived from satellite altimetry, J.A. Griggs and J.L. Bamber, in preparation for Journal of Glaciology, 2009",
  • Accumulation (Vaughan et al. 1999),
  • Ice Surface Elevation; Provided by J.A. Griggs and J.L. Bamber, July 2009. Data is regridded from a 1km Digital Elevation Model (DEM) and should be referenced to Bamber, J.L., J.L. Gomez-Dans and J.A. Griggs, The Cryosphere, 3, 101-111 (2009) and Griggs, J.A. and J.L. Bamber, The Cryosphere, 3, 113-123 (2009),
  • Bed Topography from BEDMAP1_plus (courtesy of Hamish Pritchard from BAS, bathymetry from Nitsche et al. 2007),
  • Basal Heat Flux (Shapiro and Ritzwoller 2004),
  • Basal Heat Flux (Fox Maule et al 2005) Please note that for the purposes of SeaRISE, GTHF should be capped at a value of 0.07 w/m^2, and the fields provided in the netCDF file are not capped at this value,
  • Thickness Mask (Thanks to Gael Durand and Catherine Ritz) from Bohlander and Scambos 2007,
  • Surface Velocity (x-component, y-component, and magnitude),
  • Melt (Ross ice streams),
  • Surface Balance Velocity.
Media:Antarctica_5km_withshelves_v0.75.nc
Antarctica without Ice Shelves This file was created for models that don't handle ice shelves very well. The data file contains the same fields as the "Antarctica with Ice Shelves" file described above but the data is different for three of the fields:
  • Ice Thickness
  • Ice Surface Elevation
  • Bed Topography

The differences are due to the removal of the ice sheets from the data.

Media:Antarctica_5km_woshelves_v0.75.nc
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