Using this graphic and referring to it is encouraged, and please use it in presentations, web pages, newspapers, blogs and reports.
For any form of publication, please include the link to this page and give the cartographer/designer credit (in this case Hugo Ahlenius, UNEP/GRID-Arendal)
Satellite imagery courtesy NASA/Goddard Space Flight Center Scientific Visualization Studio. Historic calving front locations courtesy of Anker Weidick and Ole Bennike
Velocity profiles based on Howat, I.M., Joughin, I.R. and Scambos, T.A. (2007). Rapid changes in ice discharge from Greenland outlet glaciers. Science, 315(5818), 1559-1561
Uploaded on Monday 27 Feb 2012
Jakobshavn Isbrae and ice fjord, showing locations of the calving ice front in years from 1851 to 2006, together with flow velocity observations
Hugo Ahlenius, UNEP/GRID-Arendal
The glacier extends through the Illulisat Icefjord, surrounded by mountains. Icebergs calve off from the main glacier, pile up and block the fjord before being released into Qeqertarsuup Tunua (Disko) Bay and Davis Strait. The whiter areas in the fjord are piledup icebergs and the “real” glacier ends where the greyish striped section ends – showing that this image is from 2001. The graph shows glacier-velocity profiles for 1985 to 2006. During this period Jakobshavn Isbrae, already the world’s fastest glacier, doubled its speed to almost 14 km per year, after rapid thinning and break up of its floating ice tongue.