Posted on 12/14/2023 6:04:58 PM PST by DoodleBob
The longest core of rock ever extracted from beneath Greenland’s thick ice could hold clues about how quickly the island’s frozen covering will melt as the planet warms.
Preliminary analysis of the rock and associated sediment suggests that, at some time in the past three million years or so, the material in this core was exposed to air. That means that the ice atop it had melted away, at least temporarily.
The work adds to a small but growing cadre of studies that use Greenland’s bedrock to illuminate how unstable the overlying ice has been in the past
…
Using the latest equipment, the US$7-million GreenDrill project succeeded this year. It drilled through 509 metres of ice at a site called Prudhoe Dome, and pulled up 7.4 metres of frozen sediment and rock.
To understand whether ice covered a particular location in the past, researchers look for radioactive isotopes that are produced in rock when it is exposed to air and cosmic rays, the high-energy particles from space that constantly bombard Earth. The GreenDrill team’s preliminary analysis suggests that the core, especially the portion that is sediment, contains high levels of beryllium-10, which is one of the key isotopes used to study bedrock exposure, Balter-Kennedy reported at the meeting. …
The amount of beryllium-10 corresponds to around 40,000 years of exposure to air, Balter-Kennedy says. That exposure could have been a single, continuous event, or, more likely, multiple episodes spread over the past few million years. The researchers’ calculations suggest that, if the Prudhoe Dome site was indeed ice-free, whether for short periods of time or a long one, then Greenland must have melted enough to contribute between 19 and 73 centimetres of global sea-level rise.
(Excerpt) Read more at nature.com ...
I just visited Mt Greylock (highest mountain of Massachusetts).
On the top, there is an illustration of the Ice age cover.
About a kilometer of ice was covering the mountain only just like 12,000 years ago.
The ice was higher than the mountain itself and the veteran monument tower on top would be just buried under the thousands of feet of ice.
There are scratches on the rocks caused by the glacier. Analysis, similar to the Greenland one, was performed there, showing that the ice melted very quickly!
“ If dinosaurs were driving SUVs. What were they using as fuel? ”
Why, methane of course, sold at Sinclair stations along with fart production vegan burritos. .
I was lucky enough to be working a Lockheed Fort Worth when she paid a visit. Beautiful restoration of an early model. And the sound when she made doing a low pass down the runway on departure.
Last ice age the sea level dropped about 400 ft, all that water had to go some where. It got land locked as ice.
Beautiful machine. Incredible sound.
And a living rebuke to the idea of global warming.
Hmmm...”Prudhoe Dome” <-—> “Prudhoe Bay”
Why does that bring to mind “I drink your milkshake”?
Not THAT much warmer. In Greenland’s case, the movement would be east to west, rather than south to north.
People forget we are coming out of an ice age. Before that Ice Age, there wasn’t as much—-you guessed it!—Ice!
Petroleum products created by ancient plant life, rotted and compressed over millennia. That is, assuming you believe the world is billions of years old, rather than 6,000, or so.
The Laurentide ice sheet was still melting and the formation of the Great Lakes was almost complete but the MSM and fake science outlets will never tell you that.
Lol
There have also been suggestions that during ice ages the ice cap of permanently frozen sea ice might have dipped far enough south for ancient humans to have walked across the Atlantic to America. And some of the earlier tools found in US resemble Western European tools from the same timescale.
There have also been suggestions that during ice ages the ice cap of permanently frozen sea ice might have dipped far enough south for ancient humans to have walked across the Atlantic to America. And some of the earlier tools found in US resemble Western European tools from the same timescale.
In that case I guess the native Americans aren’t so native to America.
Stop continental drift. NOW!
Dinosaur and cow farts did it.
Geologist have found river beds in the Sahara, that the Mediterranean Sea at one point had pretty much dried up and CO2 was so high ferns were as tall as trees.
This planet’s climate is not dependent on man.
We want a United Gondwanaland!
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