British scientists working from the Halley research station in Antarctica breathed a sigh of relief after a London-sized iceberg brushed the coast of the frozen continent.
The massive block of ice, known as A74, covers an area of almost 500 square miles and has been closely monitored by the British Antarctic Survey for the past six months as the currently mothballed Halley research station is in the same area.
Between August 9 and August 11 the iceberg made a very light contact with the Antarctic coast, scraping along the edge of the western Brunt ice shelf, Antarctica.
The scraping against the ice shelf was likely caused by strong easterly winds pushing the iceberg towards the coast, according to British Antarctic Survey experts.
British scientists working from the Halley research station in Antarctica breathed a sigh of relief after a London-sized iceberg brushed the coast of the frozen continent
The Brunt ice shelf is made from glacier ice that has flowed off the land in Antarctica and floated out to sea, with pieces gradually breaking off.
The Halley station is in the larger East Brunt region, with the A74 iceberg hitting West Brunt, which has a chasm between it and the East block.
It is still attached to East Brunt, but ‘only just’ as an enormous crack has opened up over the pst few years bringing the 650 sq mile shelf close to breaking off.
There was concern that if A74 had hit West Brunt harder, it would finally cause it to break off from the main ice shelf and create a new iceberg.
‘We’ve been monitoring the situation very closely for the past six months because A74 has been drifting around in the same kind of area,’ Dr Ollie Marsh from the British Antarctic Survey told BBC News.
‘But then there were some really strong easterly winds and these seemed to trigger a rapid movement in A74 that saw it scrape along the edge of the western Brunt.’
There are GPS sensors on the ice shelf and on A74 to help the British Antarctic Survey experts track their movements on an hourly and daily basis.
It is designed to catch any sudden movements in the ice and it revealed the small scrape against West Brunt did cause a tiny amount of rotation but not enough to break it off.
The Halley station is in the larger East Brunt region, with the A74 iceberg hitting West Brunt, which has a chasm between it and the East block
‘So there does appear to have been a bump, and it does seem to have had a bit of an effect on the western Brunt, but not enough to cause a calving,’ Dr Marsh told the BBC.
The BAS wrote on Twitter that it would continue to monitor the ice shelf and the A74 iceberg, which first calved earlier this year and has been floating about since then.
Scientists found that A74 had moved about 18 miles between August 9 and August 11, driven by strong easterly winds.
They hope that Brunt breaks up soon as it would bring an end to uncertainty over the Halley research station.
The Brunt ice shelf is made from glacier ice that has flowed off the land in Antarctica and floated out to sea, with pieces gradually breaking off
It was mothballed over uncertainty over the way the ice in the region might behave in the near future.
It is about 12 miles from the crack in the ice that would be disturbed by a large calving, such as one that would be triggered by West Brunt breaking off.
It would be very difficult to try to evacuate personnel from the research station in the middle of a calving event, according to BAS, especially now, during winter when there is 24-hour darkness.
The 12-person team working at the station left mid-February by BAS Twin Otter aircraft. The station is now closed for the Antarctic winter.
