Antarctica, Andrew discussed on BBC Inside Science


Things that we we can see over the last couple of decades is the ocean is warming their current surround antarctica and if these flow up towards the ice sheet they can start to melt the underside of the ice and that's what we think is happening and that's what's triggered this acceler ovation nice loss the ice sheet is what we call a marine grounded ice sheet if you took away west antarctica then you would not be left with land he'd be left with an ocean because it's actually sitting on the floor it's several kilometers fake sitting on the sea floor and actually as you go towards the center of the ice she just gets deeper and deeper and what happens as you melt the ice sheet and the ice she starts to retreat back towards this deep area that actually causes the flow even more quickly into the ocean and that's what's causing this acceleration we think andrew so you've calculated the rate at which antarctic melting is raising sea levels and it's three times grade since two thousand and twelve that was in the period before that so how much of that changes ascribable to human induced climate change and how much juice award antarctica would just do normally in west antarctica the pattern is very very clear it's not related to a fluctuating mutual signal related to some long term increase in the rate of ice loss and we can see that in the speed of the glossiest they're ramping year on year and poorer more ice into the oceans and this is this is not a normal pattern of behavior this is something related to changes in the conditions around the ice sheets and we know that it's in the oceans how much uncertainty is there around these figures given that you're looking at a non uniform continent.

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