For glaciers in Europe, the typical response time is between 10 and 100 years. You can estimate the response time: take the total precipitation on a ice sheet and the divide the volume by this total precipitation—this gives you a timescale. If you do this for Antarctica you get 50,000 years, for Greenland 5,000 years and for a glacier 100 years. I think that the Greenland ice sheet and in particular the ice on Antarctica are not in equilibrium with the current climate because there are climate changes that happen on much faster timescales that these 5000-50,000 years. For example the last huge climate change was the transition from the last ice age to the current inter-glacial about 15,000 years ago. And Antarctica is still adjusting to that. So even if the climate would stay constant now, you would not expect the ice sheets to stay like they are now, they probably would get smaller.
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