00:00These high-resolution radar images show how recent collapses of the
00:05Pine Island Glacier Ice Shelf caused the whole mass of ice to speed up on its
00:10slide towards the sea.
00:13The images were captured by the Copernic
00:15Sentinel-1 satellites, which are operated by the European Space Agency and
00:20equipped with synthetic aperture radar, which takes what looks like black and white
00:25photographs, but actually captures radio waves rather than visible light.
00:30Starting in 2015, the Copernicus Sentinel-1 satellites took snapshots of the
00:35Pine Island Glacier every 12 days, and then after fall 2016, they
00:40began collecting data every six days.
00:43Researchers examined all the images...
00:45...collected between January 2015 and September 2020, and used the...
00:50...multitude of images to create detailed videos of the ice floe.
00:55According to these videos and models that the team developed, the loss of ice from the
01:00shelf allowed the glacier to speed up by about 12% between late 2017...
01:05...in 2020.
01:06The glacier sped up another time in recent history...
01:10...between the 1990s and 2009, when warm ocean currents ate away at the...
01:15...underside of the ice shelf, destabilizing its structure and causing the glacier to accelerate...
01:20...toward open water.
01:21But this time, this somewhat gradual melt...
01:25...driven process wasn't the primary cause for the speed up.
01:29Instead, the...
01:30...dramatic and sudden calving of icebergs from the shelf drove this acceleration.
01:35These new findings hint that the entire ice shelf might collapse sooner than...
01:40...previously projected, within decades rather than centuries.
01:43This could hasten the...
01:45...the whole glaciers collapse in turn.
01:47But that said, we don't know exactly...
01:50...when that collapse might occur.
01:52And for now, the observed changes shouldn't drastically change...
01:55...pine island glaciers contribution to sea level rise.
01:59At present...
02:00...the glacier contributes about one-sixth of a millimeter of sea level rise each year.
02:04So even if...
02:05...that rate suddenly tripled, we're still talking about fractions of a millimeter.
02:09In the...
02:10...the words of the first author...
02:11...the changes are rapid and concerning, but not immediately...
02:15...catastrophic.
02:16Nothing's going to happen overnight.
02:20Rhealphic.
02:22It'll drop the swinging.
02:23It's broken.
02:24You'll find a little bit nationwide...
02:25...so apparance.
02:26You're a little bit around to mine.
02:27It's broken, but...
02:28...and you can't do...
02:29...look at what you're supposed to do.
02:30You're going to have to say, you're going to have to...
02:31...bez the sea level rise.
02:32My 해외벌 and the other...
02:33...what?
02:34You're not going to have to come...
02:35...to be the sea level rise.
02:36No, you're not going to do you with that.
02:37You're going to sing...
02:38...to be the sea level rise.
02:40...so that you're going to go off to the sea level rise.
02:41So you're going to have to drink the sea level rise.
02:43I'm going to have to keep the sea level rise.
02:25You
02:30You
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