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.

Antartica: Ice surface velocity draped over ice surface elevation.


Mapping: Polar Stereographic
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

Data Download

Antarctica with Ice Shelves The data files contains the following fields in a NetCDF format:
  • Latitude,
  • Longitude,
  • Mean Annual Surface Temperature (Comiso et al 2000 ),
  • Ice Thickness from BEDMAP (Liu et al. 1999),
  • Accumulation (Vaughan et al. 1999),
  • Ice Surface Elevation from BEDMAP(Liu et al. 1999),
  • Bed Topogrphy from BEDMAP1_plus(courtesy of Hamish Pritchard and BAS),
  • Basal Heat Flux(Shapiro and Ritzwoller 2004),
  • Thickness Mask,
  • Surface Velocity.
Media:Antarctica_5km_withshelves_v3.nc
Antarctica without Ice Shelves The data files contains the following fields in a NetCDF format:
  • Latitude,
  • Longitude,
  • Mean Annual Surface Temperature (Comiso et al 2000),
  • Ice Thickness from BEDMAP (Liu et al. 1999),
  • Accumulation/Ablation Rate (Vaughan et al. 1999),
  • Ice Surface Elevation from BEDMAP (Liu et al. 1999),
  • Bed Topogrphy from BEDMAP1_plus(courtesy of Hamish Pritchard and BAS),
  • Basal Heat Flux (Shapiro and Ritzwoller 2004),
  • Thickness Mask,
  • Surface Velocity.

The fields are adjusted for models that don't handle ice shelves very well and are removed using the attached mask file.

Media:Antarctica_5km_woshelves_v3.nc

The recent changes to the files above can be found in the change log.


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 and Tara Dean(BAS).

The new BEDMAP1_plus data for topography.

Data Sources

Field Description: Reference: Notes: CF Name: Units:
Precipitation Vaughan et al. 1999 J. Climate 12, 933-946 Better precip fields available?

netCDF, CF 1.3. Polar Stereographic projection, 5 km

lwe_precipitation_rate meter/year
Bed topography BEDMAP1_plus The grid is a result of merging BEDMAP1, an AGASEA-BBAS-based grid from Texas University, and bathymetry grids by Nitsche and Tara Dean(BAS). CF 1.03. Polar Stereographic projection, 5 km bedrock_altitude meter
Ice thickness BEDMAP (Liu et al. 1999) netCDF, CF 1.3. Polar Stereographic projection, 5 km land_ice_thickness meter
Surface Elevation BEDMAP (Liu et al. 1999) Can get a better data set from RAMP?

netCDF, CF 1.3. Polar Stereographic projection, 5 km

surface_altitude meter
Temperature record Vostok, interpolated over 100 yr intervals Text file, also in NetCDF N/A degrees Celsius
Sea Level change SPECMAP SPECMAP improvements? Text file, also in NetCDF N/A meter
Mean Annual Temperature Comiso et al 2000 netCDF, CF 1.3. Polar Stereographic projection, 5 km surface_temperature degrees Celsius
Geothermal flux Shapiro and Ritzwoller 2004 Fox Maule et al. 2005 is likely better basal_heat_flux watts/meter^2
Future Precipitation Forcing
Future Temperature Forcing
Future Ocean Forcing?