The deep warm circumpolar water travels all the way around the continent but has been increasingly encroaching on the icy edge of West Antarctica. JPL scientist Ron Kwok saw it as demonstrating that “the old idea that glaciers move really slowly isn’t true any more.” One result was that a lot more people started to use the radar data to examine much more of Antarctica. The small plane takes us to the camp in the middle of the West Antarctic Ice Sheet but more bad weather means more delays and it is nine days before a Hercules comes to take us back to McMurdo. They found a lot more lakes than they were expecting. But scientists are discovering new vulnerabilities that could weaken those walls from above and below. If it weren't for the ice, it would be deep ocean with a few islands. Using radar information collected between 1992 and 1996, oceanographer Eric Rignot, based at NASA’s Jet Propulsion Laboratory, found that the Pine Island Glacier’s “grounding line” — the line between the glacier’s floating section and the part of the glacier that rests on the sea floor — had retreated rapidly towards the land. Twenty-five years of satellite observations have been used to reconstruct a detailed history of Antarctica's ice shelves. © 1996-2015 National Geographic Society, © 2015- “Once we lose the summer ice cover permanently, will we tip the planet into a new climate state?”.
Her work shows that the ice sheet is not only losing mass, but it is losing mass at an accelerating rate. As they report in their new paper, the formation of rivers beneath shear margins seems to start on the land, when flowing ice streams are stretched and thinned along their edges. Mayewski, et.al., "State of the Antarctic and Southern Ocean Climate System," Rev. Gravity means ice wants to be flat. By then we have been joined by some of the scientists. Well, actually, sea ice and land ice are not the same. Some of it has been around for millions of years. “It isn’t just one type of measurement. I quickly discover why as I try to get there myself. A team of drivers in specialist snow vehicles then dragged it more than a thousand miles across the ice sheet through some of the most inhospitable terrain and weather on earth. Holly Shaftel It is not unusual to have hurricane force winds as well as very low temperatures. As the front of the glacier melts, the weight of the vast reservoir of ice behind it pushes forward. Researchers trying to understand what's happening have drilled down through seven-hundred metres of ice, to allow a robot submarine to gather information.
Between 1979 and 2017, the glacier experienced a cumulative mass loss of 268 billion tons of ice, according to the study, which was published on Monday.
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