2017-09-25. A key Antarctic glacier just lost a huge piece of ice — the latest sign of its worrying retreat.

posted Sep 29, 2017, 6:22 AM by Alan Gould
By Chris Mooney, The Washington Post. For GSS Climate Change chapter 8. Excerpt: An enormous Antarctic glacier has given up an iceberg over 100 square miles in size, the second time in two years it has lost such a large piece in a process that has scientists wondering whether its behavior is changing for the worse. The Pine Island Glacier is one of the largest in West Antarctica, ...which loses an extraordinary 45 billion tons of ice to the ocean each year — equivalent to 1 millimeter of global sea level rise every eight years — is 25 miles wide where its floating front touches the sea, and rests on the seafloor in waters more than a half-mile deep. The single glacier alone contains 1.7 feet of potential global sea level rise and is thought to be in a process of unstable, ongoing retreat. ...on Saturday, Stef Lhermitte, a satellite observation specialist at Delft University of Technology in the Netherlands, posted a satellite image  showing that Pine Island had “calved,” or broken off a piece of ice about 103 square miles in area. (For comparison, Manhattan is 22.83 square miles in size.)....  https://www.washingtonpost.com/news/energy-environment/wp/2017/09/25/a-key-antarctic-glacier-just-lost-a-piece-of-ice-four-times-the-size-of-manhattan/