Antarctica without its Ice Caps

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You said it would be interesting to see a map that accounts for sea level rise but not isostatic rebound as if IR were too slow a process to be considered alongside a “fast-paced” process such as sea-level rise – at least I’m assuming you’re considering sea-level rise to outpace IR.

What I’m saying is that IR can make significant topographic changes on timescales comparable to sea-level rise. Of course the continents won’t just bob back up, but we have to consider that when ice compressed the continents, the asthenosphere under the continent was displaced and had to bulge elsewhere (typically under the ocean where the crust is thinner, and thus displacing large amounts of water). Without ice, not only does the continental mass gain elevation, but the displaced asthensophere can return to where it came from, thus deflating this bulge under the oceanic crust, creating accommodation space for an increase in ocean water volume, thus potentially offsetting sea level transgression. Furthermore, the loss of the sheer mass of ice from Antarctica causes the continent to lose its gravitational pull on coastal water – an effect that would allow shorelines to regress.

In all, effects of isostatic rebound can happen much faster and be more significant than maybe you’ve considered (I don’t know because I don’t know what your background is – so if you *have* considered all of this, I apologise). Sure that map might be interesting, but it’s just as unrealistic a scenario as the original “Here’s what Antarctica would look like without ice” idea.

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