The Glacial-Interglacial Cycle is Driven by Orbital Forcing

[ding]

Probably, but who cares?

Probably? Didn't you make a post about thermohaline circulation causing catastrophic cooling in Europe?

 

[ding]

who cares?

Did you really just say who cares about abrupt climate change?

Isn't your whole purpose here to argue that abrupt climate change is a problem?

 

[daveman]

Obviously, world socialism is the only thing that can moderate the Earth's orbit!

 

[EMH]

The oxygen isotope curve says otherwise, dipshit. Go suck off a 12 gauge.

When was the last one, abrupt climate change?

 

[Crick]

For Greenland, all already linked.

Then you could provide them here without difficulty.

Top was green 2 million years ago.

The top of what? Northern Greenland? The top of Greenland's ice cap?

Middle went forest to ice age 440-800k year ago

Middle? Middle latitudes? Central highlands? Does the middle include the top? Does the top include the middle? Are they two separate areas? And what do you mean by "went forest to ice age"

Viking history

The Viking settlements in Greenland were limited in area and duration. And just like Iceland, the island was named deceptively. The Viking observations are of little value.

Ice core data

Ice core data can show a surface melt, but if the ice melts completely and the area becomes vegetated, there is no ice to record anything.

For North American Ice Age, the comparison is McBullshit vs. Greenland and Antarctica today, and everything McBullshit is off by a factor of 10 or more...

I've become convinced that you speak in this "stylish" manner to make it as difficult as possible to tell what you are actually saying. You are not attempting to convey information, but only to give an impression. You wish to provide as few concrete statements as possible in order to minimize your vulnerability to examination.

How old were the 2.5 mile thick glaciers covering Chicago in the past 20k-5 million years?

This is where the climate debate is now stuck. Every piece of land within 600 miles of a pole is in ice age, everything outside of that is not. Nobody has attempted to dispute that. It is the clear truth of Earth today. Milankovitch Cycles, which I call McBullshit Cycles, take a very...

www.usmessageboard.com

Following the links in your linked post, we find articles about DNA found on the bedrock underneath the ice cap. These indicate arboreal conditions across at least the southern third of Greenland 450,000 - 800,000 years ago and arboreal conditions in Peary Land, Northern Greenland, about 2 million years ago. The intervening timeline you've simply filled in with your imagination. You seem to have no data concerning conditions in North American during those periods, yet they are actually well studied and well established. You have simply chosen to reject all those data just as you reject the entire world's collection of contemporary, instrumented temperature data because they do not support your ignorant contentions.

 

[EMH]

The top of what? Northern Greenland? The top of Greenland's ice cap?

The link documents that 2 million years ago, northern Greenland was green, meaning all of Greenland, save mountain tops, was green.

And what do you mean by "went forest to ice age"

That expedition drilled through the thickest part of Greenland's ice sheet, near the "center latitude," and pulled out pine cones etc. dated 450k-800k years ago... ie the ice started up north and flowed south, getting near the middle during that time frame.

The Viking settlements in Greenland were limited in area and duration. And just like Iceland, the island was named deceptively. The Viking observations are of little value.

Bullshit. The Vikings farmed the southern tip until the 1400s, and their dwellings are buried under ice now. That is the same ice sheet that originated at the top of northern Greenland and moved south. Greenland's continent specific ice age took 1-2 million years to cover the continent as it does today. That translates to a speed of about a mile every thousand years, which if applied to McBullshit's explanation of North American Ice Age, would mean 75k years after the start of North American Ice Age, the glaciers were not even 1/10th the distance needed to get to Chicago. And since we know there were still big glaciers from North American Ice Age 10-20k years ago, it is indisputable truth that


GREENLAND FROZE WHILE NORTH AMERICA THAWED


blowing the entire Co2 and glacials BULLSHIT UP COMPLETELY.

 

[ding]

When was the last one, abrupt climate change?

The melting of the vast continental ice sheets, which began ~20,000 years ago due to gradual changes in the seasonal and spatial distribution of the Sun's energy (Broecker & Von Donk 1970), was interrupted by several abrupt cold climate events. The two largest deglacial events in the North Atlantic — known as Heinrich Stadial 1 and the Younger Dryas — occurred approximately 17,500–14,600 and 13,000–11,500 years ago respectively (Figure 6) (Heinrich 1988, Bond et al. 1992, Grootes et al. 1993).

 

[Crick]

The melting of the vast continental ice sheets, which began ~20,000 years ago due to gradual changes in the seasonal and spatial distribution of the Sun's energy (Broecker & Von Donk 1970), was interrupted by several abrupt cold climate events. The two largest deglacial events in the North Atlantic — known as Heinrich Stadial 1 and the Younger Dryas — occurred approximately 17,500–14,600 and 13,000–11,500 years ago respectively (Figure 6) (Heinrich 1988, Bond et al. 1992, Grootes et al. 1993).

Abstract from Broecker & Von Donk 1970

A detailed curve of ice volume versus time is needed in order to test the validity of the hypothesis that changes in the earth's orbital parameters are the cause of oscillations in Pleistocene climate. Although absolute ages available for glacial moraines and raised coral reefs provide a number of key points, they by no means allow a continuous curve to be drawn. Those points that exist, however, are entirely consistent with the hypothesis that the O18/O16 curves from deep-sea cores provide good approximations to the ice volume record. If so, then the primary glacial cycle must be sawtoothed in character; gradual glacial buildups over periods averaging 90,000 years in length are terminated by deglaciations completed in less than one tenth this time. Modulating this primary cycle are secondary oscillations. Those recognized during glacial growth phases average 20,000 years in length and those during the retreats about one thousand years in length. When the ice volume curve obtained in this way is compared with the summer insolation curve for the northern hemisphere, it is seen that the rapid deglaciations occur during times of unusually great seasonal contrast and that the secondary cycles modulating the glacial buildups closely parallel the insolation variations. Although these findings provide convincing evidence for the influence of orbital changes on climate, the cause of the primary sawtoothed cycle is still an open question. In conjunction with this study, we have determined the O18/O16 record for Caribbean core V12-122 and find it to be compatible with those given by Emiliani for cores P6304-8 and P6304-9. Our dating of this core by Pa231-Th230 and by magnetic reversals, however, strongly suggests that the absolute time scale adopted by Emiliani for deep-sea cores must be increased by 25%.

 

[ding]

Abstract from Broecker & Von Donk 1970

A detailed curve of ice volume versus time is needed in order to test the validity of the hypothesis that changes in the earth's orbital parameters are the cause of oscillations in Pleistocene climate. Although absolute ages available for glacial moraines and raised coral reefs provide a number of key points, they by no means allow a continuous curve to be drawn. Those points that exist, however, are entirely consistent with the hypothesis that the O18/O16 curves from deep-sea cores provide good approximations to the ice volume record. If so, then the primary glacial cycle must be sawtoothed in character; gradual glacial buildups over periods averaging 90,000 years in length are terminated by deglaciations completed in less than one tenth this time. Modulating this primary cycle are secondary oscillations. Those recognized during glacial growth phases average 20,000 years in length and those during the retreats about one thousand years in length. When the ice volume curve obtained in this way is compared with the summer insolation curve for the northern hemisphere, it is seen that the rapid deglaciations occur during times of unusually great seasonal contrast and that the secondary cycles modulating the glacial buildups closely parallel the insolation variations. Although these findings provide convincing evidence for the influence of orbital changes on climate, the cause of the primary sawtoothed cycle is still an open question. In conjunction with this study, we have determined the O18/O16 record for Caribbean core V12-122 and find it to be compatible with those given by Emiliani for cores P6304-8 and P6304-9. Our dating of this core by Pa231-Th230 and by magnetic reversals, however, strongly suggests that the absolute time scale adopted by Emiliani for deep-sea cores must be increased by 25%.

And yet the solar radiative forcing in the IPCC's report shows a positive forcing when orbital cycles predict it should be negative. Brilliant.

 

[ding]

Probably, but who cares?

Probably? Didn't you make a post about thermohaline circulation causing catastrophic cooling in Europe?

 

[Crick]

And yet the solar radiative forcing in the IPCC's report shows a positive forcing when orbital cycles predict it should be negative. Brilliant.

So, you've chosen to double down on demonstrating your ignorance.

 

[ding]

who cares?

Did you really just say who cares about abrupt climate change?

Isn't your whole purpose here to argue that abrupt climate change is a problem?

 

[ding]

So, you've chosen to double down on demonstrating your ignorance.

Says the guy who replied who cares about abrupt climate changes.

 

[Crick]

Did you really just say who cares about abrupt climate change?

Isn't your whole purpose here to argue that abrupt climate change is a problem?

No one cares to what ignorant fantasies you've locked your braindead, ratfucked ass