Antarctica, Physicist, Scientist discussed on The Science Show



Were going otherwise they see them on the beach and then they're gone. They don't know what they do. So they invented tags that would allow them to know where the seals were how deep they dove and also to measure things like temperature and salinity so they actually knew what sort of water they were forging so it really started with biologists and then the oceanographers realized that hold it. This is amazing because not only do they dive that deep but they go there and winter when we're usually back at home and so the seals have really South of sixty degrees south. We now have more Oceana graphic data collected by seals than in the history of chip-based oceanography. What should of Allah Gist are you? Are you a physicist. Assist physical oceanographer and a climate scientist covers the field. Isn't it now. What I want to know is how is the southern thousand part the ice getting on because what we saw of the northern part it really is crumbling? And we were vaguely aware aware of the West Part pent-up what about the other part so when we talk about ice down South we have to be clear to pay attention to whether we're talking about the is the frozen seawater or the ice. That's on the Arctic ice sheet. So we'll talk about the Antarctic ice sheet and Arctic Ice Sheet. It's an immense amount of ice. If all of that ice melted into the sea it would raise global sea level double by about fifty eight meters. That's not going to happen anytime soon. But as that ice runs off the continent and reaches the ocean it starts to float and that means it's exposed to the ocean and if the ocean warms or if currents carry warm water beneath those floating ice shelves the shells melts or thin and so particularly in west Antarctica. The ice shelves are thinning. And they're retreating. What happens then? Is the ice shelves like a buttress holding the ice on Antarctica and without that force that back for us that's provided by the shells more ice floes off the continent in into the ocean and that raises sea level and so in that sense the future of Antarctica A- and the Antarctic ice sheet is really tied to what happens to the surrounding oceans. And that's what's motivating our work at the moment going on the field. Yes exactly what's happening to Arctic. Ice Sheet is something that for a long time. It's been the largest uncertainty in terms of future sea level rise but satellite data shows us. That not only is Antarctica. Losing mass overall therefore raising sea level but the rate.

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