The main rift in Larsen C, which is likely to lead to one of the largest icebergs ever recorded, is currently 180 km long.  The new branch of the rift is 15 km long.  

Last year, researchers from the UK's Project Midas, led by Swansea University, reported that the rift was growing fast.  Now, just 20km of ice is keeping the 5,000 sq km piece from floating away.

Picture:  the current location of the rift on Larsen C, as of May 1 2017.  Labels highlight significant jumps. Tip positions are derived from Landsat (USGS) and Sentinel-1 InSAR (ESA) data. Background image blends BEDMAP2 Elevation (BAS) with MODIS MOA2009 Image mosaic (NSIDC). Other data from SCAR ADD and OSM.

Professor Adrian Luckman of Swansea University College of Science, head of Project Midas, described the latest findings:

“While the previous rift tip has not advanced, a new branch of the rift has been initiated.  This is approximately 10km behind the previous tip, heading towards the ice-front.

This is the first significant change to the rift since February of this year.  Although the rift length has been static for several months, it has been steadily widening, at rates in excess of a metre per day.

It is currently winter in Antarctica, therefore direct visual observations are rare and low resolution. Our observations of the rift are based on synthetic aperture radar (SAR) interferometry from ESA’s Sentinel-1 satellites.  Satellite radar interferometry allows a very precise monitoring of the rift development."

Researchers say the loss of a piece a quarter of the size of Wales will leave the whole shelf vulnerable to future break-up.  Larsen C is approximately 350m thick and floats on the seas at the edge of West Antarctica, holding back the flow of glaciers that feed into it.

Picture: Larsen C ice rift – aerial view.  (Credit:  John Sonntag/NASA)

Professor Adrian Luckman said:

“When it calves, the Larsen C Ice Shelf will lose more than 10% of its area to leave the ice front at its most retreated position ever recorded; this event will fundamentally change the landscape of the Antarctic Peninsula.

We have previously shown that the new configuration will be less stable than it was prior to the rift, and that Larsen C may eventually follow the example of its neighbour Larsen B, which disintegrated in 2002 following a similar rift-induced calving event.

The MIDAS Project will continue to monitor the development of the rift and assess its ongoing impact on the ice shelf. Further updates will be available on our blog, and on our Twitter feed”

Find out more about Project Midas

Study geography at Swansea University College of Science

Picture:  ice flow velocities of Larsen C in February 2017, from ESA Sentinel-1 data.