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Author Topic: Larsen "B" will be gone in a decade: NASA  (Read 2777 times)

Vergent

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Larsen "B" will be gone in a decade: NASA
« on: May 15, 2015, 01:35:55 AM »
A new NASA study finds the last remaining section of Antarctica's Larsen B Ice Shelf, which partially collapsed in 2002, is quickly weakening and likely to disintegrate completely before the end of the decade.

A team led by Ala Khazendar of NASA's Jet Propulsion Laboratory (JPL) in Pasadena, California, found the remnant of the Larsen B Ice Shelf is flowing faster, becoming increasingly fragmented and developing large cracks. Two of its tributary glaciers also are flowing faster and thinning rapidly.

"These are warning signs that the remnant is disintegrating," Khazendar said. "Although it’s fascinating scientifically to have a front-row seat to watch the ice shelf becoming unstable and breaking up, it’s bad news for our planet. This ice shelf has existed for at least 10,000 years, and soon it will be gone."


http://www.nasa.gov/press-release/nasa-study-shows-antarctica-s-larsen-b-ice-shelf-nearing-its-final-act

nukefix

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Re: Larsen "B" will be gone in a decade: NASA
« Reply #1 on: May 15, 2015, 11:28:30 AM »
S-1 12.5.2015, the remnant is clearly in bad shape with multiple visible cracks


oren

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Re: Larsen "B" will be gone in a decade: NASA
« Reply #2 on: May 15, 2015, 01:37:41 PM »
Apologies for nitpicking, but according to the NASA article Larsen B is expected to be gone not in a decade, but before the end of the decade, which actually means in half a decade from now...

nukefix

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Re: Larsen "B" will be gone in a decade: NASA
« Reply #3 on: May 15, 2015, 01:49:12 PM »
I remember looking at SAR-images of the remnant about 5 years ago and don't remember seeing such cracks..

nukefix

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Re: Larsen "B" will be gone in a decade: NASA
« Reply #4 on: May 15, 2015, 04:27:58 PM »
I had some time to play-around, here's a S-1 multitemporal RGB (18.4/30.4/12.5)


mspelto

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Re: Larsen "B" will be gone in a decade: NASA
« Reply #5 on: May 26, 2015, 02:38:19 AM »
In this case it is not just the cracks, but those circular depression indicates points of collapse where the thickness is just not sufficient to support the ice shelf.

solartim27

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Re: Larsen "B" will be gone in a decade: NASA
« Reply #6 on: October 26, 2016, 06:56:05 PM »
Looks like the collapse is speeding up.  Here is a gif from 2014, 2015, and now.

https://antarcticsun.usap.gov/science/contenthandler.cfm?id=4269
(Good podcast on linked page)
« Last Edit: October 26, 2016, 08:03:01 PM by solartim27 »
FNORD

logicmanPatrick

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Re: Larsen "B" will be gone in a decade: NASA
« Reply #7 on: January 06, 2017, 02:21:23 PM »
oren:
Apologies for nitpicking, but according to the NASA article Larsen B is expected to be gone not in a decade, but before the end of the decade, which actually means in half a decade from now...

Ah yes!  The surprise test paradox.
https://plato.stanford.edu/entries/epistemic-paradoxes/#SurTesPar

Personally, I give it 3 years max before that chunk calves.
si hoc legere scis nimium eruditionis habes

Susan Anderson

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Re: Larsen "B" will be gone in a decade: NASA
« Reply #8 on: February 08, 2017, 05:52:39 PM »
Interesting history and discussion at Earth Observatory (it's a great site, this is dated 7 February though the image title implies it might be 2016):
http://earthobservatory.nasa.gov/IOTD/view.php?id=89588&src=eoa-iotd

« Last Edit: February 08, 2017, 06:24:20 PM by Susan Anderson »