A 45 million year record of Arctic sea temperatures and ice melt

[San Souci]

A new study uses AI and machine learning to examine data from archaean lipid membranes providing surface temperature, CO2 levels and oxygen isotope content correlation over the past 45 million years.

ABSTRACT
Cenozoic evolution of the Antarctic ice sheets is thought to be driven primarily by long-term changes in radiative forcing, but the tectonic evolution of Antarctica may also have played a substantive role. While deep-sea foraminiferal oxygen isotope records provide a combined measure of global continental ice volume and ocean temperature, they do not provide direct insights into non-radiative influences on Antarctic Ice Sheet dynamics. Here we present an Antarctic compilation of Cenozoic upper-ocean temperature for the Ross Sea and offshore Wilkes Land, generated by membrane lipid distributions from archaea. We find trends of ocean temperature, atmospheric carbon dioxide and oxygen isotopes largely co-vary. However, this relationship is less clear for the late Oligocene, when high-latitude cooling occurred despite interpretation of oxygen isotopes suggesting global warming and ice-volume loss. We propose this retreat of the West Antarctic Ice Sheet occurred in response to a tectonically driven marine transgression, with warm surface waters precluding marine-based ice-sheet growth. Marine ice-sheet expansion occurred only when ocean temperatures further cooled during the Oligocene–Miocene transition, with cold orbital conditions and low atmospheric carbon dioxide. Our results support a threshold response to atmospheric carbon dioxide, below which Antarctica’s marine ice sheets grow, and above which ocean warming exacerbates their retreat. "

Climatic and tectonic drivers of late Oligocene Antarctic ice volume - Nature Geoscience (Sorry, but this is a Nature Geoscience paywall)

This study supports the earlier study finding a high likelihood that CO2 levels above 400 ppm are likely to completely eliminate the Antarctic ice shelves which will lead to massively increased glacial ice sheet loss and large rises in sea levels.

The study sucks. There is no Global Warming.

 

[Dagosa]

Why your own link didn’t say anything about co2

Go to that website and ask.

 

[Crick]

The study sucks. There is no Global Warming.

And what do you say to the massive amounts of evidence that the globe IS warming?

 

[Crick]

Anyone that claims they know what was going on 45 million years ago is an idiot.

So you reject the existence of dinosaurs?

 

[Crick]

he won't because that data does not exist. Their prophet, the great algore, said that by now the entire state of florida and most of the east coast would be under water and that there would be no ice at either pole. He lied.

I'm curious why you attack Al Gore when the people threatening your delusions are the world's scientists. It kinda looks like you're afraid because you know you picked the wrong side and don't know how to escape your humiliation.

 

[jc456]

Go to that website and ask.

I don’t need to, I know already

 

[ding]

They said….in the report. You have a reading problem ?
“Water vapor and clouds are the major contributors to Earth's greenhouse effect, but a new atmosphere-ocean climate modeling study shows that the planet's temperature ultimately depends on the atmospheric level of carbon dioxide”

Right. A computer model, dummy. If I constructed a computer model of Joe Biden butt fucking you would that be proof of Joe Biden butt fucking you?

 

[jc456]

And what do you say to the massive amounts of evidence that the globe IS warming?

What evidence?

 

[jc456]

I'm curious why you attack Al Gore when the people threatening your delusions are the world's scientists. It kinda looks like you're afraid because you know you picked the wrong side and don't know how to escape your humiliation.

Gore made it personal

 

[Crick]

I don’t need to, I know already

Why is such an answer absolutely no surprise coming from you. No surprise WHAT SO EVER. Now HERE is a perfect example of Dunning-Krueger.

 

[jc456]

Why is such an answer absolutely no surprise coming from you. No surprise WHAT SO EVER. Now HERE is a perfect example of Dunning-Krueger.

so why don't you post this overwhelming evidence then and stop Dunning-Kruegering everyone?

 

[Lastamender]

So you reject the existence of dinosaurs?

I reject the knowledge of the temperatures the dinosaurs lived with.

 

[Crick]

I reject the knowledge of the temperatures the dinosaurs lived with.

Let me save us some time.

Q: Why do you accept the existence of the dinosaurs?
A: Because we have hard evidence of their existence: fossils of their bones, imprints of their footsteps

We have hard evidence of temperature as well, it's just not as obvious as a gigantic leg bone of an Apatosaurus or the tooth of a Tyrannosaur. There are lots of chemical reactions controlled by temperature. By looking at the ratios between the reactants and the product, we can tell what the temperature was when the reactions took place. Additionally, differences in the molecular mass of isotopes of elements lead to differences in the energy required to vaporize them or given up when they condense. This leads to temperature dependent changes in the ratios of isotopes which can be determined by a process called isotopic fractionation. These and other means allow scientists to work out the temperature when specific geological layers were laid down millions and millions of years ago.

 

[Lastamender]

Why do you accept the existence of the dinosaurs?

Are you going to tell me they can actually know the temperature eons ago? Please don't.

 

[Crick]

Are you going to tell me they can actually know the temperature eons ago? Please don't.

Too late - look up one post

From NOAA

History of hot​

Temperature records from thermometers and weather stations exist only for a tiny portion of our planet's 4.54-billion-year-long life. By studying indirect clues—the chemical and structural signatures of rocks, fossils, and crystals, ocean sediments, fossilized reefs, tree rings, and ice cores—however, scientists can infer past temperatures.

None of these techniques help with the very early Earth. During the time known as the Hadean (yes, because it was like Hades [ended 4.0 billion years ago -Op]), Earth’s collisions with other large planetesimals in our young solar system—including a Mars-sized one whose impact with Earth likely created the Moon—would have melted and vaporized most rock at the surface. Because no rocks on Earth have survived from so long ago, scientists have estimated early Earth conditions based on observations of the Moon and on astronomical models. Following the collision that spawned the Moon, the planet was estimated to have been around 2,300 Kelvin (3,680°F).

What's the hottest Earth's ever been?

Earth’s hottest periods occurred before humans existed. Those ancient climates would have been like nothing our species has ever seen.

www.climate.gov

 

[San Souci]

And what do you say to the massive amounts of evidence that the globe IS warming?

Checked the weather lately? (snicker)

 

[ding]

Why is such an answer absolutely no surprise coming from you. No surprise WHAT SO EVER. Now HERE is a perfect example of Dunning-Krueger.

Nope still not an example.

 

[ding]

We have hard evidence of temperature as well, it's just not as obvious as a gigantic leg bone of an Apatosaurus or the tooth of a Tyrannosaur. There are lots of chemical reactions controlled by temperature. By looking at the ratios between the reactants and the product, we can tell what the temperature was when the reactions took place. Additionally, differences in the molecular mass of isotopes of elements lead to differences in the energy required to vaporize them or given up when they condense. This leads to temperature dependent changes in the ratios of isotopes which can be determined by a process called isotopic fractionation. These and other means allow scientists to work out the temperature when specific geological layers were laid down millions and millions of years ago.

That evidence shows a cooling planet for the last 50 million years punctuated by bipolar glaciation and then really cold temperatures.

 

[Crick]

Checked the weather lately? (snicker)

Are you kidding me or or are you just exceptionally stupid? How many times has the sentiment "weather is not climate" been posted on this forum? A hundred times? A thousand times? And what percentage of the planet's surface do the contiguous 48 states make up? 1.6%. You're not san souci, you're san cerveau.

 

[San Souci]

Are you kidding me or or are you just exceptionally stupid? How many times has the sentiment "weather is not climate" been posted on this forum? A hundred times? A thousand times? And what percentage of the planet's surface do the contiguous 48 states make up? 1.6%. You're not san souci, you're san cerveau.

Sure. Don't let the Sky fall on you.