A new study combined GPS, satellite data, and numerical modeling. It found ice loss from northeast Greenland could be six times greater by the end of the century than previously thought. Ice is continuously streaming off Greenland's melting glaciers at an accelerating rate, dramatically increasin
River of meltwater on the Zachariae Glacier, northeast Greenland. Credit: Shfaqat Abbas Khan, DTU Space
By 2100, the Northeast Greenland Ice Stream will contribute six times as much to the rising sea level as previous models suggested, adding between 13,5 to 15,5 mm , according to the new study. This is equivalent to the entire Greenland ice sheet’s contribution in the past 50 years. Scientists from Denmark, the United States, France, and Germany carried out the research.
Animation of modeled frontal positions from 2007 to 2100. A Landsat-8 image from 2017 is used as the background. The color denotes the surface speed. Credit: Animation by Shfaqat Abbas Khan, DTU Space, DenmarkThe study is partly based on data collected from a network of precise GPS stations reaching as far as 200 km inland on the Northeast Greenland Ice Stream—located behind the Nioghalvfjerdsfjord Gletscher and Zachariae Isstrøm glaciers, one of Earth’s most hostile and remote terrains.
Animation of modeled surface elevation change from 2007 to 2100. A Landsat-8 image from 2017 is used as the background. The colors denote surface elevation change. Negative values denote thinning/surface lowering. Credit: Animation by Shfaqat Abbas Khan, DTU Space, DenmarkIn 2012, after a decade of melting, the floating extensions of Zachariae Isstrøm collapsed, and the glacier has since retreated inland at an accelerating pace.
The Zachariae Isstrøm was stable until 2004, followed by steadily retreat of the ice front until 2012, when a large portion of the floating sections became disconnected. As more precise observations of change in ice velocity are included in models, it is likely that IPCC’s estimates of 22-98 cm global sea level rise will need to be corrected upwards.
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Sea levels might rise much faster than thought, data from Greenland suggestTereza is a London-based science and technology journalist, aspiring fiction writer and amateur gymnast. Originally from Prague, the Czech Republic, she spent the first seven years of her career working as a reporter, script-writer and presenter for various TV programmes of the Czech Public Service Television. She later took a career break to pursue further education and added a Master's in Science from the International Space University, France, to her Bachelor's in Journalism and Master's in Cultural Anthropology from Prague's Charles University. She worked as a reporter at the Engineering and Technology magazine, freelanced for a range of publications including Live Science, Space.com, Professional Engineering, Via Satellite and Space News and served as a maternity cover science editor at the European Space Agency.
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