Err zero sum.  What do you suppose the ratio is, that ice displaces ginormous amounts of mass?  It won't when large volumes of submerged/ marginal ice patches melt.  Those sheets ARE displacing mass what logically happens when they don't?  
Also Antarctica is a land mass, it has also local climate, separate of the artic.
Ocean temperatures may be rising, but what about volume?, ice?, localclimates?, current volume displacement?