Antarctica is melting. The ice mass is dropping at an accelerating rate due to multiple factors including accelerated glacial ice calving rates. The loss of sea based ice allows the Antarctic ice to move faster towards the ocean resulting in an increased rate of loss to the Antarctic ice.
Antarctica is losing ice mass while gaining ice extent. Land ice is different to sea ice. Antarctica is losing ice as illustrated below in the ice mass chart from the GRACE satellite.
http://ossfoundation.us/projects/environment/global-warming/antarctic-ice-melt
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