[YetAnotherMatt]

I'm not a physicist. I did get curious and went to Wikipedia. You're mostly spot on:

>It covers an area of almost 14 million square kilometres (5.4 million square miles) and contains 26.5 million cubic kilometres (6,400,000 cubic miles) of ice.[2] A cubic kilometer of ice weighs approximately one metric gigaton, meaning that the ice sheet weighs 26,500,000 gigatons.

26,500,000 gigatons is 2.65e+18 kg in scientific notation.

I compared this to the moon, which is 7.35 x 10^22 kg, or about 30,000 times as heavy. The moon does create quite some tidal effects, while at 384,400 km distance.

Since gravity is inversely proportional to the square of the distance Both the 50m of local displacement as well as the 2000km distance until it sufficiently cancelled out sound believable to me.

[DalasNoin]

the mass of the iceshield / mass of the moon = 5 10^-4. But at a distance of 2000km compared to 4 10^5 km for the moon, the iceshield should have similar gravitational pull. the inverse square of 2000km / the inverse square of 4 10^5 km = 4 10^4. (4e4=(1/2000000^2)/(1/(4e8)^2))

Distance and mass seem to cancel out almost perfectly

[DalasNoin]

I think you are off by an order of magnitude, it should be 2.65 10^19 kg. one gigaton is 10^12 kg , 26,500,000=2.65*10^7

[YetAnotherMatt]

You're right, thanks!