I find it curious that AGW can be blamed when there has been no Antarctic warming for the last 29+ years. The trends are negative. They need to find another reason for the calving of an ice island. It's not AGW.
SoPol Negative Trend:
http://tinypic.com/fullsize.php?pic=ehrp3&s=3&cap ...
SoPol Land Negative Trend:
http://tinypic.com/fullsize.php?pic=35bxmy1&s=3&c ...
SoPol Ocean Negative Trend:
http://tinypic.com/fullsize.php?pic=2nle1yp&s=3&c ...
Graphs are of MSU data
There an oceanic connection between El Nino oscillations and the Southern Ocean.  Maybe that can be used to help explain any regionalized warming, if there is any.  Or maybe it's just the natural calving of what has been called an Ice Island for many years.
http://www.jpl.nasa.gov/releases/2002/release_2002_54.htm ...
Full paper here.
http://neptune.gsfc.nasa.gov/publications/pdf/pubs2002/2_ ...
Regards