The Glacial-Interglacial Cycle is Driven by Orbital Forcing

[Crick]

The Chick doesn't read her own posts ... let alone her links ... such a foolish lil' girl ...

The OP is completely fraudulent, copy/pasted from some stupid Hysterical site ... just a mess of fancy=pants sciency words that make young ladies "bowels" tingle ... she denies mathematics ... insolation is an algebraic function of irradiation and albedo ... right there in the form of SB we're using ... I guess Chick-e-poo can only add ...

"Global average insolation" is not the same thing as insolation you adolescent. And if you think I have mis-defined the term, show us a REFERENCE SOURCE that says something different. As for the rest, are you denying that ice corers in Greenland hit bedrock and found organic plant material there? The studies and articles covering it are numerous.

Google AI

Scientists have discovered plant material in ice cores from Greenland, including twigs, leaves, liverwort plants, and wooly feather moss. The fossils are so well preserved that they can be seen with the naked eye and are millions of years old. The discoveries provide evidence of Greenland's past climate and plant life, and suggest that the ice sheet may not be as permanent as previously thought.

In 2017, researchers rediscovered a 15-foot-long ice core drilled by U.S. Army scientists in 1966 in northwest Greenland. The core had been abandoned in freezers for decades, but when examined, it contained well-preserved plant remains instead of the usual sand and rock. The fossils were found in ice cores from Camp Century, which were relocated to Rødovre, a Copenhagen suburb, in 2017.

The discoveries suggest that the site was ice-free at some point in the past million years and may have been covered with green tundra. The fossils also provide evidence that the Greenland Ice Sheet has melted entirely during past warm periods, similar to what's happening now due to human-caused climate change. This suggests that Greenland is more sensitive to climate change than previously thought and may be at risk of irreversibly melting. If the Greenland ice sheet completely melts, the sea could rise by as much as 7 meters.

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https://www.pnas.org/doi/10.1073/pnas.2407465121

Scientists stunned to discover plants beneath mile-deep Greenland ice

Scientists found frozen plant fossils, preserved under a mile of ice on Greenland. The discovery helps confirm a new and troubling understanding that the Greenland Ice Sheet has melted entirely during recent warm periods in Earth's history -- like the one we are now creating with human-caused...

www.sciencedaily.com

Fossil Plants at Bottom of the Greenland Ice Sheet Warn of Future Melting

The discovery of fossil plants below a mile of Greenland ice indicates that the ice sheet completely melted in the past, and suggests it could rapidly do so again.

news.climate.columbia.edu

Researchers find 3-million-year-old landscape beneath Greenland ice sheet - NASA Science

An ancient tundra landscape preserved under the Greenland Ice Sheet tells us that the ice sheet has persisted much longer than previously known, enduring through many past periods of global warming.

science.nasa.gov

Researchers discover intact plant fossils beneath Greenland’s ice sheet for the first time

For the first time ever, researchers have found fossils under Greenland's ice sheet that are so large and well preserved that they can be seen with the naked eye. The fossils reveal several million years of details about climate and plant life in Greenland according to the UCPH researcher behind...

news.ku.dk

Intact Plant Fossils Discovered Beneath Greenland’s Ice Sheet After Lucky Find of Ice Cores Drilled by U.S. Military in 1966

For the first time ever, researchers have found fossils under Greenland's ice sheet that are so large and well preserved that they can be seen with the naked eye. The fossils reveal several million years of details about climate and plant life in Greenland according to the UCPH researcher behind the

scitechdaily.com

DEFINITIONS

insolation: a. : solar radiation that has been received. b. : the rate of delivery of direct solar radiation per unit of horizontal surface. broadly : that relating to total solar radiation.

insolation​

(from incoming solar radiation) The solar radiation that is received at the earth's surface per unit area

insolation: the quantity of solar radiation falling upon a body or planet, esp per unit area

Insolation is derived from the words "incoming solar radiation". Insolation is specifically applied to radiation which is arriving at earth’s atmosphere first and then earth's surface. The heat comes from solar energy. Insolation is the solar radiation that reaches the earth's surface. It is measured by the amount of solar energy received per square centimetre per minute. Solar energy received over the planet’s surface varies according to season, latitude, transparency of the atmosphere, and aspect or ground slope.

I'm not the one that's not doing enough reading.

 

[ReinyDays]

"Global average insolation" is not the same thing as insolation you adolescent. And if you think I have mis-defined the term, show us a REFERENCE SOURCE that says something different. As for the rest, are you denying that ice corers in Greenland hit bedrock and found organic plant material there? The studies and articles covering it are numerous.

Google AI

Scientists have discovered plant material in ice cores from Greenland, including twigs, leaves, liverwort plants, and wooly feather moss. The fossils are so well preserved that they can be seen with the naked eye and are millions of years old. The discoveries provide evidence of Greenland's past climate and plant life, and suggest that the ice sheet may not be as permanent as previously thought.

In 2017, researchers rediscovered a 15-foot-long ice core drilled by U.S. Army scientists in 1966 in northwest Greenland. The core had been abandoned in freezers for decades, but when examined, it contained well-preserved plant remains instead of the usual sand and rock. The fossils were found in ice cores from Camp Century, which were relocated to Rødovre, a Copenhagen suburb, in 2017.

The discoveries suggest that the site was ice-free at some point in the past million years and may have been covered with green tundra. The fossils also provide evidence that the Greenland Ice Sheet has melted entirely during past warm periods, similar to what's happening now due to human-caused climate change. This suggests that Greenland is more sensitive to climate change than previously thought and may be at risk of irreversibly melting. If the Greenland ice sheet completely melts, the sea could rise by as much as 7 meters.

---

---

https://www.pnas.org/doi/10.1073/pnas.2407465121

Scientists stunned to discover plants beneath mile-deep Greenland ice

Scientists found frozen plant fossils, preserved under a mile of ice on Greenland. The discovery helps confirm a new and troubling understanding that the Greenland Ice Sheet has melted entirely during recent warm periods in Earth's history -- like the one we are now creating with human-caused...

www.sciencedaily.com

Fossil Plants at Bottom of the Greenland Ice Sheet Warn of Future Melting

The discovery of fossil plants below a mile of Greenland ice indicates that the ice sheet completely melted in the past, and suggests it could rapidly do so again.

news.climate.columbia.edu

Researchers find 3-million-year-old landscape beneath Greenland ice sheet - NASA Science

An ancient tundra landscape preserved under the Greenland Ice Sheet tells us that the ice sheet has persisted much longer than previously known, enduring through many past periods of global warming.

science.nasa.gov

Researchers discover intact plant fossils beneath Greenland’s ice sheet for the first time

For the first time ever, researchers have found fossils under Greenland's ice sheet that are so large and well preserved that they can be seen with the naked eye. The fossils reveal several million years of details about climate and plant life in Greenland according to the UCPH researcher behind...

news.ku.dk

Intact Plant Fossils Discovered Beneath Greenland’s Ice Sheet After Lucky Find of Ice Cores Drilled by U.S. Military in 1966

For the first time ever, researchers have found fossils under Greenland's ice sheet that are so large and well preserved that they can be seen with the naked eye. The fossils reveal several million years of details about climate and plant life in Greenland according to the UCPH researcher behind the

scitechdaily.com

DEFINITIONS

insolation: a. : solar radiation that has been received. b. : the rate of delivery of direct solar radiation per unit of horizontal surface. broadly : that relating to total solar radiation.

insolation​

(from incoming solar radiation) The solar radiation that is received at the earth's surface per unit area

insolation: the quantity of solar radiation falling upon a body or planet, esp per unit area

Insolation is derived from the words "incoming solar radiation". Insolation is specifically applied to radiation which is arriving at earth’s atmosphere first and then earth's surface. The heat comes from solar energy. Insolation is the solar radiation that reaches the earth's surface. It is measured by the amount of solar energy received per square centimetre per minute. Solar energy received over the planet’s surface varies according to season, latitude, transparency of the atmosphere, and aspect or ground slope.

I'm not the one that's not doing enough reading.

The question was mathematical ... how does obliquity change irradiation? ... I'm sorry SweatPea ... irradiation is flux per unit area no matter the source, so that includes the Sun ... stupid ... and includes the Earth, ≈ 250 W/m^2 of outgoing irradiation (depending on albedo) ...

Does the Earth have outgoing "insolation"? ... HAHAHAHAHAHAHAHAHAHAHAHAHA ...

I'm using joules, seconds and meters ... you're using ergs, minutes and centimeters ... how confused are you? ...

 

[EMH]

Scientists have discovered plant material in ice cores from Greenland, including twigs, leaves, liverwort plants, and wooly feather moss. The fossils are so well preserved that they can be seen with the naked eye and are millions of years old. The discoveries provide evidence of Greenland's past climate and plant life, and suggest that the ice sheet may not be as permanent as previously thought

Naturally, since the Greenland Ice Age is only 1-2 million years old, and before that Greenland was further south and hence COMPLETELY UNFROZEN.

There is no "back and forth" dynamic at work on Greenland, and those who claim that are complete liars with ZERO EVIDENCE....

 

[EMH]

Climate cycle ...

1. Climate fanatic makes a prognosis of doom for Earth based on information he doesn't understand.

2. People question or refute said prognostication

3. Climate fanatic insults their intelligence / gets angry

4. Rinse, Repeat

Why do you think Faux "News" will never ask these extremely basic climate questions??


1. Why does one Earth polar circle have 9+ times the ice of the other?
2. Why is there ice age glacier south of Arctic Circle on Greenland but no such ice age glacier north of Arctic Circle on Alaska?
3. If the oceans are "warming" why is the record decade for canes still the 1940s?
4. If the oceans are "rising" why can't we see one single photo of land sinking?
5. How did Co2 thaw North America and freeze Greenland at the same time?

 

[Robert W]

The explanation is given in the OP. If you actually disagree, you could try explaining why.

Hey Superman, is it true you came here to manage global climate?

 

[EMH]

That includes the latest ice age, the Quaternary Period, which began 2.58 million years ago and continues through this day

LMFAO!!

While Greenland and Antarctica added ice during that time, North America lost 5+ million cubic miles of it.

Ice Ages are CONTINENT SPECIFIC, and hence the OP is full of shit Co2 FRAUD bullshit yet again...

 

[ding]

Changes in eccentricity are small and so this factor has a small, but non-zero, effect on the Earth's climate.

So slow, gradual and small. How does that cause glacial periods to begin and end?

 

[ding]

This tends to moderate northern hemisphere (NH) winter and increase the intensity of southern hemisphere (SH) summers. When the angle has rotated 180 degrees, these effects will be reversed.

So slow, gradual, seasonal and no net change to total annual irradiation?

How would this trigger a glacial period and end a glacial period?

 

[ding]

Larger obliquity angles lead to deglaciation. The

How?

 

[ReinyDays]

So slow, gradual and small. How does that cause glacial periods to begin and end?

My problems with eccentricity is I'm too damn lazy to try and find an accurate enough value of the semi-major axis ... what's nominally published is ± 10,000 km, and that effectively gives a zero value for changes in distance ... and irradiation ... and thus climate ...

The OP is falsified ... it's math ...

 

[EMH]

I'm too damn lazy

part of the definition of "taxpayer funded climate scientist"

 

[Robert W]

So slow, gradual and small. How does that cause glacial periods to begin and end?

We must not question Crick since he came to us to save the planet.

 

[ReinyDays]

part of the definition of "taxpayer funded climate scientist"

Which weather service isn't taxpayer supported? ... did you ever find all that 19th Century satellite data NBCNews has? ...

 

[Crick]

The question was mathematical ... how does obliquity change irradiation? ... I'm sorry SweatPea ... irradiation is flux per unit area no matter the source, so that includes the Sun ... stupid ... and includes the Earth, ≈ 250 W/m^2 of outgoing irradiation (depending on albedo) ...

Does the Earth have outgoing "insolation"? ... HAHAHAHAHAHAHAHAHAHAHAHAHA ...

I'm using joules, seconds and meters ... you're using ergs, minutes and centimeters ... how confused are you? ...

Obliquity changes the amount of solar radiation falling on higher latitudes. That will cause glaciation to melt and recede.

Are you teaming up with Ding to contend that the glacial-interglacial cycle is NOT caused by Milankovitch orbital forcing?

 

[EMH]

Which weather service isn't taxpayer supported? ... did you ever find all that 19th Century satellite data NBCNews has? ...

LOL!!!

Satellites went up in the 1970s...

BTW, since you are such the chosen expert on climate change, how about answering a few simple climate questions for us...


1. Why does one Earth polar circle have 9+ times the ice of the other?
2. Why is there ice age glacier south of Arctic Circle on Greenland but no such ice age glacier north of Arctic Circle on Alaska?
3. If the oceans are "warming" why is the record decade for canes still the 1940s?
4. If the oceans are "rising" why can't we see one single photo of land sinking?
5. How did Co2 thaw North America and freeze Greenland at the same time?
6. How many land masses within 600 miles of an Earth pole are not in ice age?
7. How many land masses outside of 600 miles of an Earth pole are in ice age?
8. If there has been an ongoing net ice melt, why is Surface Air Pressure dropping for the past 70 years?

 

[Crick]

LOL!!!

Satellites went up in the 1970s...

BTW, since you are such the chosen expert on climate change, how about answering a few simple climate questions for us...


1. Why does one Earth polar circle have 9+ times the ice of the other?
2. Why is there ice age glacier south of Arctic Circle on Greenland but no such ice age glacier north of Arctic Circle on Alaska?
3. If the oceans are "warming" why is the record decade for canes still the 1940s?
4. If the oceans are "rising" why can't we see one single photo of land sinking?
5. How did Co2 thaw North America and freeze Greenland at the same time?
6. How many land masses within 600 miles of an Earth pole are not in ice age?
7. How many land masses outside of 600 miles of an Earth pole are in ice age?
8. If there has been an ongoing net ice melt, why is Surface Air Pressure dropping for the past 70 years?

If we answer all your questions, will you go away?

 

[ReinyDays]

Obliquity changes the amount of solar radiation falling on higher latitudes. That will cause glaciation to melt and recede.

Are you teaming up with Ding to contend that the glacial-interglacial cycle is NOT caused by Milankovitch orbital forcing?

The glaciation melts and recedes every summer ... then receives new snow and grows every winter ... that's called "seasons" and yes obliquity is the cause of the seasons ... but any seasonal changes are offset 6 months later ... the annual difference is nothing ... where this equilibrium point is for any glacier will be mostly the same year-to-year or decade-to-decade ... and no one cares about century-to-century differences ...

Which Milankovitch Cycles matches the Interglacial cycle? ... the OP clearly states Milankovitch Cycles are irregular ... oh right, you didn't read the OP ... God forbid you should have any understanding of periodicity ... show us the math, stupid, F = G (m1m2/d^2) ...

 

[Crick]

The glaciation melts and recedes every summer ... then receives new snow and grows every winter ... that's called "seasons" and yes obliquity is the cause of the seasons ... but any seasonal changes are offset 6 months later ... the annual difference is nothing ... where this equilibrium point is for any glacier will be mostly the same year-to-year or decade-to-decade ... and no one cares about century-to-century differences ...

We aren't discussing the seasons. We are discussing the 41,000 year cycle over which Earth's obliquity varies from 22.1 to 24.5 degrees.

Which Milankovitch Cycles matches the Interglacial cycle? ... the OP clearly states Milankovitch Cycles are irregular ... oh right, you didn't read the OP ... God forbid you should have any understanding of periodicity ... show us the math, stupid, F = G (m1m2/d^2) ...

Initially, the glacial-interglacial cycles had a period of 41,000 years, matching that of obliquity. About one million years ago at a point in time called the MPT for Mid-Pleistocene Transition, the amplitude of the temperature oscillation increased and the period increased to 100,000 years (the period of eccentricity). If you want to debate these points, you need to do a little reading. Just reading ding posts won't do anything for you.

 

[EMH]

If we answer all your questions, will you go away?

LOL!

This is the US Message Board, not the Israel Message Board...

You are TOO CHICKEN to answer BASIC CLIMATE QUESTIONS....

GO BACK TO WHERE YOU CAME FROM!!!

 

[EMH]

the OP clearly states Milankovitch Cycles are irregular

like everything else about the Co2 FRAUD, Milankovitch is complete bullshit, or McBullshit...

destroyed on both poles...

The lies of Milankovich Cycles aka McBullshit - where was land mass Antarctica 70 million years ago

McBullshit claims Antarctica has been on the South Pole forever, it never moved at all. And, while it is on the South Pole, it has rapidly gone from ice age to tropical paradise and back over and over.... a Dennis Quaid theory for sure... We know that Antarctica has 70 million year old...

www.usmessageboard.com

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