But a flow of upper mantle from beneath the ocean floor of the Great Southern Ocean towards the Antarctic isostatic adjustment would actually lower the seafloor in that region, lowering sealevels somewhat.
I proposed a (semi-serious) solution to rising ocean levels a while ago on this forum; by excavating the continental shelf and building new countries from scratch, we could lower the net sea-floor level and thereby the level of the ocean surface. By causing a net flow in the mantle beneath the Great Southern Ocean towards Antarctica there could be a slight lowering of the Ocean after all.
Eventually, that depression in the seafloor would also adjust istself, as upper mantle flows in from the rest of the world... wouldn't it? Hmm. This is somewhat more complex than I thought at first.
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