Impact of Melt on Ice Shelf Dynamics And Stability
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Iceberg A68 one year on
One year ago, Iceberg A-68 calved away from the Larsen C Ice Shelf. One quarter the size of Wales, and weighing more than a trillion tonnes, this iceberg has been classified as the sixth largest since records began. As can be seen in the satellite image animation, over the last year A-68 has not drifted far because of dense sea-ice cover in the Weddell Sea.
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Larsen C responds to the calving of A68
On July 12 2017, data from the Sentinel-1 satellite confirmed the calving from the Larsen C Ice Shelf of Iceberg A68, a slab of ice 5,800 km in area and weighing more than 1 trillion tonnes. New Sentinel-1 interferometry data from July 18 now shows how the remaining ice shelf is responding to the calving event.
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Larsen C calves trillion ton iceberg
A one trillion tonne iceberg – one of the biggest ever recorded - has calved away from the Larsen C Ice Shelf in Antarctica. The calving occurred sometime between Monday 10th July and Wednesday 12th July 2017, when a 5,800 square km section of Larsen C finally broke away. The iceberg, which is likely to be named A68, weighs more than a trillion tonnes. Its volume is twice that of Lake Erie, one of the Great Lakes.
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Larsen C rift branches as it comes within 5 km of calving
As the Larsen C ice shelf moves closer to calving one of the largest icebergs on record, there are clear signs of changes in the part of the shelf which is about to calve. In late June 2017, the soon-to-be iceberg tripled in speed, producing the fastest flow speeds ever recorded on Larsen C, and seemed to be on the verge of breaking free.
Continue reading "Larsen C rift branches as it comes within 5 km of calving"
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Larsen C iceberg accelerates ahead of calving
In another sign that the iceberg calving is imminent, the soon-to-be-iceberg part of Larsen C Ice Shelf has tripled in speed to more than ten meters per day between 24th and 27th June 2017. The iceberg remains attached to the ice shelf, but its outer end is moving at the highest speed ever recorded on this ice shelf. We still can’t tell when calving will occur - it could be hours, days or weeks - but this is a notable departure from previous observations.
Continue reading "Larsen C iceberg accelerates ahead of calving"