Iceberg B-31, as big as city, breaks free

Iceberg B-31 acquired November 13, 2013

Iceberg B-31 acquired by the Operational Land Imager on the Landsat 8 satellite November 13, 2013.
Image Credit NASA

(Source NASA) – Between November 9–11, 2013, a large iceberg finally separated from the calving front of Antarctica’s Pine Island Glacier.Scientists first detected a rift in the glacier in October 2011 during flights for NASA’s Operation IceBridge. By July 2013, infrared and radar images indicated that the crack had cut completely across the ice shelf to the southwestern edge. New images now show that Iceberg B-31 is finally moving away from the coast, with open water between the iceberg and the edge of Pine Island Glacier.

Read: Largest Iceberg ever recorded finally breaks up, Ross Iceshelf B-15:

The Operational Land Imager on the Landsat 8 satellite acquired these natural-color images of the iceberg in Pine Island Bay on November 13 (top) and October 28, 2013. Clouds and fog make the November 13 image a bit hazy, but the open-water gap between the iceberg and the ice shelf is still apparent. Click here for a wider view of the iceberg from November 10, just after the separation.

Icebery B-31

This MODIS image taken by NASA’s Aqua satellite on Nov. 10, 2013, shows an iceberg that was part of the Pine Island Glacier and is now separating from the Antarctica continent. What appears to be a connection point on the top left portion of the iceberg is actually ice debris floating in the water.
The original rift that formed the iceberg was first observed in October 2011 but as the disconnection was not complete, the “birth” of the iceberg had not yet happened. It is believed the physical separation took place on or about July 10, 2013, however the iceberg persisted in the region, adjacent to the front of the glacier.
The iceberg is estimated to be 21 miles by 12 miles (35 km by 20 km) in size, roughly the size of Singapore. A team of scientists from Sheffield and Southampton universities will track it and try to predict its path using satellite data.
Image credit: NASA

Named B-31 by the U.S. National Ice Center, the new iceberg is estimated to be 35 kilometers by 20 kilometers (21 by 12 miles), roughly the size of Singapore. A team of scientists from Sheffield and Southampton universities will track the 700 square-kilometer chunk of ice and try to predict its path using satellite data.

“It is hard to predict with certainty where and when these things will drift,” said NASA glaciologist Kelly Brunt. “Icebergs move pretty slowly, and watching this iceberg will be a waiting game.”

The shelf of Pine Island Glacier has been moving forward at roughly 4 kilometers per year, so the calving of this iceberg is not necessarily a surprise, noted Tom Wagner, NASA’s cryosphere program manager. Such events happen about every five or six years, though Iceberg B-31 is about 50 percent larger than previous ones in this area. Scientists have been studying Pine Island Glacier closely because there is evidence that warmer seawater below the shelf will cause the ice grounding line to retreat and the glacier to thin and speed up.

If Pine Island Bay clears of ice by the annual sea ice minimum in February–March, then Iceberg B-31 could move out into the Southern Ocean. Once it leaves the bay, the iceberg is likely to get caught up in the flow of the “coastal counter current”—which flows counterclockwise around Antarctica—or the “circumpolar current,” which is larger, wider, and flows clockwise.

Which way it goes depends on the vertical shape and depth of the iceberg, according to NASA scientist emeritus Robert Bindschadler. “Where it is going depends on the deeper currents into which its keel extends,” he said. Researchers have found that larger icebergs with deeper keels tend to drift with the deeper, cyclonic circumpolar current, while sea ice and smaller bergs with shallower keels tend to drift with the coastal counter current.

“If you ever throw a stick into a mountain stream, you would see an erratic flow as it spins, accelerates, and decelerates,” Bindschadler said. “I imagine a similarly variable current field working on the iceberg’s keel. This iceberg is like a very, very big stick.”

But before any of that drifting occurs, Iceberg B-31 has to get out of Pine Island Bay. “It takes a bit of energy and time to move these guys into the Southern Ocean,” Brunt added. “Many icebergs in Pine Island Bay have persisted for years before exiting, so this could be a long waiting game.”

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