Difference between revisions of "Present Day Antarctica"

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Revision as of 15:49, 31 March 2009

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?