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Judi Lynn

(160,449 posts)
Thu Sep 17, 2020, 09:27 AM Sep 2020

Hidden rivers of warm water threaten vast Antarctic glacier


By Rafi Letzter - Staff Writer 21 hours ago

Sea levels could rise more than two feet if just this one glacier collapses.



Instruments aboard the British Antarctic Survey ship RV Nathaniel B Palmer helped scientists map the channels under the glacier.
(Image: © Alex Mazur/British Antarctic Survey)

One of the largest, most unstable glaciers in Antarctica is sliding into the ocean. That's due, in large part, to hidden rivers of warm water that lubricate its underbelly, more so now than ever in the era of climate change. Now, researchers know what those unseen channels look like.

By using equipment that can measure fluctuations in gravity, radar and seismic waves, scientists were able to map precisely where these glacier-melting channels cut through the deep seabed.

"It was fantastic to be able to map the channels and cavity system hidden beneath the ice shelf; they are deeper than expected — some are more than 800 meters [2,600 feet] deep," study lead researcher Tom Jordan, an aero-geophysicist at the British Antarctic Survey, said in a statement. "They form the critical link between the ocean and the glacier."

Thwaites Glacier is a vast brick of ice flowing into Pine Island Bay in western Antarctica. If you took off in an airplane from El Paso, Texas and flew due south — across about 590 miles (950 kilometers) of western Mexico and 5,700 miles (9,200 km) of Pacific Ocean — you'd see it out your window as a white expanse with sheer cliffs where it meets open water.

More:
https://www.livescience.com/thwaites-glacier-hidden-rivers-mapped.html
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Hidden rivers of warm water threaten vast Antarctic glacier (Original Post) Judi Lynn Sep 2020 OP
Between this, Miguelito Loveless Sep 2020 #1
Dead man walking Boomer Sep 2020 #2
Scientists have always been fairly conservative people Miguelito Loveless Sep 2020 #3
Agreed Boomer Sep 2020 #4
He died far too young Miguelito Loveless Sep 2020 #5

Miguelito Loveless

(4,454 posts)
1. Between this,
Thu Sep 17, 2020, 09:55 AM
Sep 2020

the ice sheet in Greenland collapsing, and the methane explosions in Russia, I would say we are past the tipping point. It is now moving into an amplifying feedback loop that will cook us alive. The time to act was in the 80s-90s. The last possible chance to act was the early 2000s.

Avaricious capitalism and conservatism have doomed us.

Boomer

(4,167 posts)
2. Dead man walking
Thu Sep 17, 2020, 03:59 PM
Sep 2020

I know that many scientists and activists are desperately promoting the "only a few years left in which to act" bandwagon, but ultimately I think that effort is a misguided attempt to break through the complacency of the masses. They've helped foster the illusion that there is some way -- eventually -- to avert what will happen. The feeble efforts of even the most fervent activists are no better than just spitting in the wind.

Climate change itself will take the draconian action we've avoided: massive depopulation and removal of our industrial infrastructure.


Miguelito Loveless

(4,454 posts)
3. Scientists have always been fairly conservative people
Thu Sep 17, 2020, 04:08 PM
Sep 2020

As a group they don't like to make "Doomsday" predictions, since they are data driven and they know data can be wrong, or misinterpreted. As I have followed the reports since the 90s, the undertone I picked up has been that while they give a range of how bad it could be, the emphasis was on the lower end of "bad". But some scientists I spoke with said they did not dare publish the actual bad numbers, because they were VERY BAD. If they published them, they would be dismissed as cranks, and their reputations would be destroyed.

So, they hedged, and buried the really bad numbers.

If Jonas Salk were alive today, his reward for the smallpox vaccine would be death threats and professional ruination, such is the contempt that science is help by about a third of the populace.

I do not believe we can fix this no matter what we do. We are six feet from the cliff's edge, driving at 100 mph. The only change we can make is how close our body will be to the wreckage.

Boomer

(4,167 posts)
4. Agreed
Thu Sep 17, 2020, 08:23 PM
Sep 2020

And totally off topic, may I say how much I love your DU screen name. It makes me smile every time I see it. Loveless was one of my favorite characters on WWW, and a damn good actor in his dramatic roles, like Ship of Fools.

Miguelito Loveless

(4,454 posts)
5. He died far too young
Thu Sep 17, 2020, 10:26 PM
Sep 2020

and I agree he was a great talent. His Loveless was the epitome of the intelligent, urbane, and oh so polite, gentleman villain.

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