Description of the parameters and references to it can be found under:
LeBrocq_2010_EarthSystSciData.pdf


coordinate system:

WGS 84 / Antarctic Polar Stereographic
EPSG:3031

+proj=stere +lat_0=-90 +lat_ts=-71 +lon_0=0 +k=1 +x_0=0 +y_0=0 +ellps=WGS84 +datum=WGS84 +units=m +no_defs +towgs84=0,0,0