In 1986, a big iceberg separated from the Fichner-Ronne ice shelf in West Antarctica. It was so massive that it grew to become grounded, caught to the seafloor, and remained in place for 40 years. Lastly, it has now been pushed off the seafloor and has begun drifting within the Weddell Sea to a area within the South Atlantic known as Iceberg Alley. Designated A23a, this monster berg measures 4000 sq km (1,500 sq. miles) and is about 400 meters (1,300 ft) thick – the world’s largest.
On the floor, A23a is about 4 instances the scale of New York Metropolis. However as is well-known about icebergs, you have to look under the floor, too. At 400 meters thick, your complete physique of ice provides as much as greater than a trillion tons of frozen water.
ESA’s Copernicus Sentinel-1 satellite tv for pc has been keeping track of the transferring behemoth, which seems to be pushed by winds and currents. Scientists estimate it’s presently transferring at a price of about 4.8 km (3 miles) every day.
ESA said it isn’t uncommon for icebergs to change into grounded, however over time they shrink sufficient to unground and float.
Now that this iceberg is on the free, scientists can’t predict precisely the place it can go subsequent. Nevertheless, like most icebergs from the Weddell sector, A23a is prone to find yourself within the South Atlantic on Iceberg Alley.
Whereas A23a is large, it’s not the largest ever. It is just about one-third the scale of the largest iceberg in recorded historical past, B-15 which calved off of Antarctica’s Ross Ice Shelf in 2000. The B-15 iceberg coated greater than 10,878 sq. km (4,200 sq. miles) when it broke away, in accordance with NASA’s Earth Observatory. B-15 has since fractured into quite a few smaller bergs, and most have melted away.
One other biggie was A-76 which got here free in 2021 and measured round 4,320 sq. km (1,670 sq. miles) in measurement. At 170 km (106 miles) in size and 25 km (15 miles) huge, the iceberg was barely bigger than the Spanish island of Majorca, and greater than the state of Rhode Island within the US.
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