by Rafi Letzter
Look at that iceberg. It’s beautiful. Perfectly rectangular. An object of near geometric perfection jutting into a polar sea of the usual squiggly, chaotic randomness of the natural world. It calls to mind the monolith from “2001: A Space Odyssey.”
But, unlike the monolith from that very weird movie, this iceberg was not deposited on this world by space aliens. Instead, as Kelly Brunt, an ice scientist with NASA and at the University of Maryland, explained, it was likely formed by a process that’s fairly common along the edges of icebergs.
“So, here’s the deal,” Brunt told Live Science. “We get two types of icebergs: We get the type that everyone can envision in their head that sank the Titanic, and they look like prisms or triangles at the surface and you know they have a crazy subsurface. And then you have what are called ‘tabular icebergs.'” [In Photos: Huge Icebergs Break Off Antarctica]
Tabular icebergs are wide and flat, and long, like sheet cake, Brunt said. They split from the edges of ice shelves — large blocks of ice, connected to land but floating in the water surrounding iced-over places like Antarctica. This one came from the crumbling Larsen C ice shelf on the Antarctic Peninsula.
From yesterday's #IceBridge flight: A tabular iceberg can be seen on the right, floating among sea ice just off of the Larsen C ice shelf. The iceberg's sharp angles and flat surface indicate that it probably recently calved from the ice shelf. pic.twitter.com/XhgTrf642Z
— NASA ICE (@NASA_ICE) October 17, 2018
Tabular icebergs form, she said, through a process that’s a bit like a fingernail growing too long and cracking off at the end. They’re often rectangular and geometric as a result, she added.
“What makes this one a bit unusual is that it looks almost like a square,” Brunt said.
It’s difficult to tell the size of the iceberg in this photo, she said, but it’s likely more than a mile across. And, as with all icebergs, the part visible above the surface is just the top 10 percent of its mass. The rest, Brunt said, is hidden underwater.
In the case of tabular icebergs, she said, that subsurface mass is usually regular-looking and geometric, similar to what’s visible above. This iceberg looks pretty fresh, she said — its sharp corners indicate that wind and waves haven’t had much time to break it down.
But despite the berg’s large mass, Brunt said, she wouldn’t advise going on a walk on its surface.
“It probably wouldn’t flip over,” she said.
The thing is still much wider than it is deep, after all. But it’s small enough to be unstable and crack up at any moment.
So, it’s probably best to marvel at the thing from a distance.
Originally published on Live Science.