[aerohead]

I don't have that material with me. I believe that part of the grounding line IS submerged, which is part of the problem; as warm deep-water gyres melt the grounding line from below.
As the ice leaves, with no ice shelves left to buttress it in place, the crust will experience tectonic isostatic rebound, lifting the continent higher and higher as it loses the weight of the ice, in itself creating a positive feedback loop for sea level rise. Now-exposed, submerged ice will just float off the sunken bedrock.