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Antarctica 2017

Re: Antarctica 2017

Unread postby jedrider » Thu 18 May 2017, 18:01:45

dohboi wrote:And now there's a story in the Guardian, for the trifecta!

https://www.theguardian.com/science/201 ... eseatchers

Climate change is turning Antarctica green, say researchers

In the past 50 years the quantity and rate of plant growth has shot up, says study, suggesting further warming could lead to rapid ecosystem changes


Ah, future home of mankind. It's starting to look habitable.
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Re: Antarctica 2017

Unread postby dohboi » Fri 19 May 2017, 21:51:56

Yup

future real estate prospects loom...

and now rolling stone is picking up the antarctic story...but the topic still doesn't rate a sticky on our humble site, for some reason...

http://www.rollingstone.com/politics/fe ... er-w481260
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Re: Antarctica 2017

Unread postby Plantagenet » Fri 19 May 2017, 22:12:59

dohboi wrote:and now rolling stone is picking up the antarctic story...

http://www.rollingstone.com/politics/fe ... er-w481260


Lots of different scenarios have been proposed for "DOOM" over the years

Now, according to Rolling Stone, we've got a "DoomsDay Glacier".

The newly funded NSF study of Thwaites Glacier should get us some more data in a couple more years to better evaluate just how dangerous this threat will turn out to be and how quickly it will eventuate..

IMHO Its going to turn out to be very very dangerous.

Cheers!

"Its a brave new world"
---President Obama, 4/25/16
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Re: Antarctica 2017

Unread postby dohboi » Sat 20 May 2017, 01:56:28

Thanks, P.

And the hits just keep comin'

“Decoding Antarctica's response to a warming world”

http://www.bbc.com/news/science-environment-39975709

In the iceberg-infested waters of the Amundsen Sea Embayment (ASE), it obtained the very first cores to be drilled from just in front of some of the mightiest glaciers on Earth.

Chief among these are Pine Island Glacier and Thwaites Glacier, colossal streams of ice that drain the White Continent and which are now spilling mass into the ocean at an alarming rate.

There's concern that deep, warm water is undercutting the glaciers, possibly tipping them into an unstoppable retreat. And that has global implications for significant sea-level rise.
...
The goal was to retrieve seafloor sediments that would reveal the behaviour of the West Antarctic Ice Sheet (WAIS) in previous warm phases. To read the future in the past.

"If you find ice-rafted debris (stones dropped by icebergs), for example, you can be sure there was ice on land and that the ice had advanced to the coast," explained Claus-Dieter Hillenbrand from the British Antarctic Survey (BAS).

"But also new developments - especially what's known as geochemical provenance - have emerged in the last 10 years that mean it's even possible now to compare this material with rocks on land to pin down the actual sources in the hinterland
.

thnx to aslr at neven's forum for this
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Re: Antarctica 2017

Unread postby dohboi » Sun 21 May 2017, 09:20:53

CNN has picked up on Antarctic greening, too

http://edition.cnn.com/2017/05/19/europ ... index.html
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Re: Antarctica 2017

Unread postby Revi » Fri 26 May 2017, 06:59:31

The Rolling Stone article is really interesting. The short story is that there is a continental shelf that's holding back the warm water, and it's getting in now and melting underneath the glacier. It is 6000 feet deep and goes down to bedrock, under sea level. Once it melts it will start to fall into the ocean. The tallest cliffs of ice are 300 feet tall, so that 6000 will have to crumble down to 300, and it's going to take a while and continuous crashing of the ice mass will continue until we have raised sea levels by hundreds of feet. Maybe by the end of the century. Great...

http://www.rollingstone.com/politics/fe ... er-w481260
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Re: Antarctica 2017

Unread postby Newfie » Sat 03 Jun 2017, 08:15:46

Larsen C is set to have a large break off, likely leading general disintegration.

http://www.abc.net.au/news/science/2017 ... ng/8585418
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Re: Antarctica 2017

Unread postby dohboi » Sun 04 Jun 2017, 23:19:51

Yup

It's a comin'

Ibon, how's that sale of your Florida property goin'?
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Re: Antarctica 2017

Unread postby Revi » Mon 05 Jun 2017, 08:31:35

Image

Here's the latest image I found of what's going on with Larsen C. It's making a break for the coast!
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Re: Antarctica 2017

Unread postby Plantagenet » Mon 05 Jun 2017, 16:55:45

Revi wrote:The Rolling Stone article is really interesting. The short story is that there is a continental shelf that's holding back the warm water, and it's getting in now and melting underneath the glacier. It is 6000 feet deep and goes down to bedrock, under sea level. Once it melts it will start to fall into the ocean. The tallest cliffs of ice are 300 feet tall, so that 6000 will have to crumble down to 300, and it's going to take a while and continuous crashing of the ice mass will continue until we have raised sea levels by hundreds of feet. Maybe by the end of the century. Great...

http://www.rollingstone.com/politics/fe ... er-w481260


Its even worse than that.

Once the ocean water gets into the deep basin under the glacier, the edge of the glacier will become buoyant. This encourages rapid calving and collapse of the ice margin. This means you can get really rapid ice retreat without melting occurring right at the glacier---the glacier becomes unstable. The glacier retreats rapidly and generates armadas of ice bergs that float away and melt elsewhere----. Destroying a glacier by calving bergs from its margins can occur much more rapidly then by melting it all in situ.

Image
Cheers!
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Re: Antarctica 2017

Unread postby dohboi » Wed 07 Jun 2017, 21:32:53

Nicely put.

The other dynamic that Richard Alley and others have discussed is the physical fact of the limits to stability of tall ice cliffs: once they get more than 100 meter tall (including above and below the water line), the cliffs are inherently unstable and will keep on collapsing back--in most cases to ever higher, even less stable cliffs--till the entire glacier is rubble on its way to the sea to melt. This can happen remarkably rapidly. Few fully appreciate the consequences of this physical fact about ice cliff behavior, it seems.
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Re: Antarctica 2017

Unread postby Revi » Mon 12 Jun 2017, 12:42:04

I read that in the Rolling Stone article. That's the scary part. 300 feet is the height of the highest ice walls, and the Thwaites glacier is 6000 feet tall and goes down to bedrock, below sea level, with at least 1800 above sea level! Endless collapse!

http://www.rollingstone.com/politics/features/the-doomsday-glacier-w481260
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Re: Antarctica 2017

Unread postby dohboi » Thu 15 Jun 2017, 13:44:33

Get ready for a lot of future hydrofracture events in the WAIS:

Scientists stunned by Antarctic rainfall and a melt area bigger than Texas

https://www.washingtonpost.com/news/ene ... 6054dc4fdf

Scientists have documented a recent, massive melt event on the surface of highly vulnerable West Antarctica that, they fear, could be a harbinger of future events as the planet continues to warm.

In the Antarctic summer of 2016, the surface of the Ross Ice Shelf, the largest floating ice platform on Earth, developed a sheet of meltwater that lasted for as long as 15 days in some places. The total area affected by melt was 300,000 square miles, or larger than the state of Texas...


(Thanks to ASLR at ASIF for text and link...I'm still not clear on why the Arctic gets a sticky thread but not the Antarctic... [smilie=bduh.gif] [smilie=dontknow.gif]
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