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Satellite measurements have been done and the sea floor is sinking relative to the continental crust so sea level SHOULD be falling. In some places the continental rise is quite extreme, the places were loss of ice has changed the isostatic balance of the continent.


Based on calculations of the effect of melting ice on sea level, we know that to effect a 1 mm change in global sea level requires around 360 km3 water. The largest lake by volume, Lake Baikal, contains just under 24,000 km3 of water. So if you created an equivalent lake you would lower sea level by 66 mm. At current rates of global sea level rise that would ...


It is not hard to do this calculation if you have global topography. Using a version with $\frac{1}{6}$- degree resolution and a sea level rise of 1027 m, the result is @Erik's value of 445 million cubic km. Here's the bit of MATLAB code: H = 1027; % sea level rise (m) topo(topo<0) = 0; % change all ocean depths to zero topo(topo>H) = H; % level ...

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