Major Antarctic ice bridge breaks, Wilkins ice shelf on the verge of breaking off. - Tilted Forum Project Discussion Community

MSD · 04-06-2009, 07:33 AM

BBC NEWS | Science & Environment | Ice bridge ruptures in Antarctic

Quote:

An ice bridge linking a shelf of ice the size of Jamaica to two islands in Antarctica has snapped.
Scientists say the collapse could mean the Wilkins Ice Shelf is on the brink of breaking away, and provides further evidence of rapid change in the region.
Sited on the western side of the Antarctic Peninsula, the Wilkins shelf has been retreating since the 1990s.
Researchers regarded the ice bridge as an important barrier, holding the remnant shelf structure in place.
Its removal will allow ice to move more freely between Charcot and Latady islands, into the open ocean.
European Space Agency satellite pictures had indicated last week that cracks were starting to appear in the bridge. Newly created icebergs were seen to be floating in the sea on the western side of the peninsula, which juts up from the continent towards South America's southern tip.
Professor David Vaughan is a glaciologist with the British Antarctic Survey who planted a GPS tracker on the ice bridge in January to monitor its movement.
He said the breaking of the bridge had been expected for some weeks and much of the ice shelf behind was likely to follow.
"We know that [the Wilkins Ice Shelf] has been completely or very stable since the 1930s and then it started to retreat in the late 1990s. But we suspect that it's been stable for a very much longer period than that," he told BBC News.
"The fact that it's retreating and now has lost connection with one of its islands is really a strong indication that the warming on the Antarctic is having an effect on yet another ice shelf."

While the break-up will have no direct impact on sea level because the ice is floating, it heightens concerns over the impact of climate change on this part of Antarctica.
Over the past 50 years, the peninsula has been one of the fastest warming places on the planet.
Many of its ice shelves have retreated in that time and six of them have collapsed completely (Prince Gustav Channel, Larsen Inlet, Larsen A, Larsen B, Wordie, Muller and the Jones Ice Shelf).
Separate research shows that when ice shelves are removed, the glaciers and landed ice behind them start to move towards the ocean more rapidly. It is this ice which can raise sea levels, but by how much is a matter of ongoing scientific debate.
Such acceleration effects were not included by the UN's Intergovernmental Panel on Climate Change (IPCC) when it made its latest projections on likely future sea level rise. Its 2007 assessment said ice dynamics were poorly understood.

It may not have a direct impact on sea levels, but this is a reminder that the clock is ticking and we have to keep pushing to end the massive cycle we've started. It seems so abstract and far away, so it's good that it makes the news (even if most don't make a big deal about it like they should.) I try to keep big concerns like this in my mind, but it takes "oh shit" moments like this to hammer the point home from time to time.

braisler · 04-06-2009, 07:43 AM

Unfortunately, the "oh shit" moment only happens for people who actually pay attention to this sort of thing and realize the implications. The idea that climate change is happening and it is upon us right now is gaining some momentum. But there are still way to many nay-sayers and people who just don't care.

The US government official position for years was wait-and-see and needs-more-study. All that had more to do with the changes needed were going to cost industry profits so it was better (for them) to ignore the problem.

ring · 04-06-2009, 07:59 AM

here is a link to the ESA.
The web cam from space is amazingly disturbing to watch.

ESA Portal - Collapse of the ice bridge supporting Wilkins Ice Shelf appears imminent

lostgirl · 04-06-2009, 08:21 AM

Yes, this is quite disturbing. I watched this the other night on Discovery. It is a reminder that things are changing and fast.

04-06-2009, 07:59 AM	#3 (permalink)
ring ░ Location: ❤	here is a link to the ESA. The web cam from space is amazingly disturbing to watch. ESA Portal - Collapse of the ice bridge supporting Wilkins Ice Shelf appears imminent Last edited by ring; 04-06-2009 at 08:06 AM.. Reason: added

04-06-2009, 08:21 AM	#4 (permalink)
lostgirl lightform Location: Edge of the deep green sea	Yes, this is quite disturbing. I watched this the other night on Discovery. It is a reminder that things are changing and fast. __________________ We're about to go through the crucible, but we'll come out the other side. We always arise from our own ashes. Everything returns later in its changed form. - Children of Dune

04-06-2009, 07:43 AM	#2 (permalink)
braisler Addict Location: Midway, KY	Unfortunately, the "oh shit" moment only happens for people who actually pay attention to this sort of thing and realize the implications. The idea that climate change is happening and it is upon us right now is gaining some momentum. But there are still way to many nay-sayers and people who just don't care. The US government official position for years was wait-and-see and needs-more-study. All that had more to do with the changes needed were going to cost industry profits so it was better (for them) to ignore the problem.