I would have thought, it’s water, and there’s no barrier between the hemispheres so wouldn’t the water just level out over the whole of the planet anyway?
Just picked this out of google about the ice age…
‘Glaciers store about 75 percent of the world’s fresh water. During the maximum point of the last ice age, glaciers covered about 32 percent of the total land area.’
When I think of the Antarctica ice melting, I imagine it’s like an ice cube melting on a plate, it start to melt slow but as it sits in the melted water warming up around it, the ice melts faster and faster the smaller it gets basically.
I can’t see how it could have so much of an effect on the earth’s spin; at least I can’t see how much of a noticeable effect it could have on the earth. When you consider this is water that’s been on the planet and it’s atmosphere since time immemorial, continuously being recycled.