Jonathan Amos, Antarctica, West Antarctica discussed on Global News Podcast


Jonathan amos has been telling me more about that findings we've been looking at the white continent over the past twenty five years with satellites long we've had them up there and they go over they measured the shape they're also able to way antarctica believe it or not just by seeing how the pulo gravity changes they go overhead and so they've been doing this assessment through the is looking at how much ice is being lost because his woman some of the ocean water is getting close to the edges of antarctica smelting some of the glasses and the melt rate is increasing and now we're losing about two hundred billion tons of ice to the ocean each year let something like point six of a millimeter equivalent of global sea level rise now might not sound very much but it is increasing and you know when we look forward in time and taught canal is becoming a big big contributor so whereas in the past we thought you know maybe come the end of the century and taught to come might not have contributed very much from this assessment when now thinking at least fifteen centimeters now fifteen centimeters is a lot when you think about storm surges overtopping defenses lowlying countries macos that's not all of wedlock he level comes from why is this happening now in particular in antarctica and you mentioned the west antarctica sheet which is this part of antarctic which sits very much below sea level so as the east just a large part of the content kind of sits out of the water on the rock whereas the west much of the is actually sits below sea level and that means that if wall mortar comes towards it it can start to erode the edges and erodes the edges the classes they get thinner they flow foster through able to dump more ice into the ocean it's feedback process so that's why we're particularly concerned about the west the east of the continent hasn't changed from emphatically maybe slightly.

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