Abstract
Jakobshavns Isbrae in West Greenland (terminus at ≈69° 10′N/50deg;,W), a major outlet glacier of the Greenland Ice Sheet and a continuously fast-moving ice stream, has long been the fastest moving and one of the most productive glaciers on Earth. It had been moving continuously at speeds of over 20m/day with a stable front position throughout most of the latter half of the 20th century, except for relatively small seasonal changes. In 2002 the ice stream apparently suddenly entered a phase of rapid retreat. The ice front started to break up, the floating tongue disintegrated, and the production of icebergs increased.
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