Present Day Antarctica
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.
|Latitude of Projection Origin||-90.0|
|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).
Antarctica Data Set Visuals
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:
|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:
The differences are due to the removal of the ice shelves from the data.
|ANTARCTICA DEVELOPMENTAL DATA SET||
An Antarctica "Developmental" Data Set has been created incorporating data described in
Le Brocq, Anne M; Payne, Antony J; Vieli, Andreas (2010): An improved Antarctic dataset for high resolution numerical ice sheet models (ALBMAP v1). Earth System Science Data, 2, 247-260. doi: 10.5194/essd-2-247-2010
This data set was downloaded from http://doi.pangaea.de/10.1594/PANGAEA.734145
Fields in the developmental data set taken directly from Le Brocq et al's data set are:
Fields in the developmental data set derived from Le Brocq et al's data set are:
Fields retained from the SeaRISE standard data set described above are:
Notes: Le Brocq et al use a 1160x1120 grid whose grid points correspond with those in the standard 1200x1200 SeaRISE data set grid starting in the lower left hand corner. The temperature, geothermal heat flux (Shapiro & Ritzwoller), and bedrock topography fields from Le Brocq et al's data set were extrapolated onto the additional grid points on the SeaRISE standard grid using thin-plate radial basis functions. The accuracy of these extrapolated fields is not expected to effect the model results. The extension of the temperature and geothermal heat flux field used only the new data (pure extrapolation) but the bedrock topography also used interpolation of the bedrock topography field in the existing SeaRISE standard data set. All other fields provided by Le Brocq et al have a constant value along their edges and this constant value was used to fill the SeaRISE standard grid. For all fields, the data on the 1160x1120 grid provided by Le Brocq et al were copied directly with the exception that Le Brocq et al use a "fill value" of -9999 where data is missing in their accumulation and geothermal heat flux (Fox Maule et al only) fields but these values have been set to zero in the Antarctica developmental data set.
Additional fields provided by Le Brocq et al but not included in the SeaRISE developmental data set include various masks, lower ice surface elevations (including the one used to calculate ice thickness in the developmental data set), and a second topography field which includes more detail in the Recovery Basin adjacent to the Ronne Ice Shelf. This topography data was not included in the developmental data set due to scepticism of its accuracy.