Milankovitch Cycles and where we are at today

[Old Rocks]

The Milankovitch Cycles are no longer controlling our climate, we are;

 

[Elton]

The Milankovitch Cycles are no longer controlling our climate, we are;

I don't see any real evidence that that is true.

Do you have any?

 

[Old Rocks]

I don't see any real evidence that that is true.

Do you have any?

There is no way you are going to see what you do not wish to see.

 

[ding]

The Milankovitch Cycles are no longer controlling our climate, we are;

If only you had a laboratory experiment quantifying the associated temperature for varying concentrations of atmospheric CO2.

 

[ding]

Milankovitch Cycles didn't cause any glacial cycles prior to the earth transitioning from a greenhouse planet to an icehouse planet. None. Nada. Zip

 

[Old Rocks]

If only you had a laboratory experiment quantifying the associated temperature for varying concentrations of atmospheric CO2.

Now Dingleberry, that experiment has been running for 4.5 billion years. But a willfully ignorant ass like you would not know that;

 

[ding]

In other words Milankovitch Cycles are just one component in a highly complex and adaptive climate system.

 

[ding]

Now Dingleberry, that experiment has been running for 4.5 billion years. But a willfully ignorant ass like you would not know that;

Lot's of variables in that 4.5 billion year experiment that can't be accounted for, dummy.

Why not perform a laboratory experiment to quantify the associated temperature for varying concentrations of CO2?

 

[Old Rocks]

Milankovitch Cycles didn't cause any glacial cycles prior to the earth transitioning from a greenhouse planet to an icehouse planet. None. Nada. Zip

Such a silly ass you remain;

Periodic variations in Earth’s orbit and rotation axis occur over tens of thousands of years, producing rhythmic climate changes known as Milankovitch cycles. The geologic record of these climate cycles is a powerful tool for reconstructing geologic time, for understanding ancient climate change, and for evaluating the history of our solar system, but their reliability dramatically decreases beyond 50 Ma. Here, we extend the analysis of Milankovitch cycles into the deepest stretches of Earth history, billions of years ago, while simultaneously reconstructing the history of solar system characteristics, including the distance between the Earth and Moon. Our results improve the temporal resolution of ancient Earth processes and enhance our knowledge of the solar system in deep time.

Abstract​

The geologic record of Milankovitch climate cycles provides a rich conceptual and temporal framework for evaluating Earth system evolution, bestowing a sharp lens through which to view our planet’s history. However, the utility of these cycles for constraining the early Earth system is hindered by seemingly insurmountable uncertainties in our knowledge of solar system behavior (including Earth–Moon history), and poor temporal control for validation of cycle periods (e.g., from radioisotopic dates). Here we address these problems using a Bayesian inversion approach to quantitatively link astronomical theory with geologic observation, allowing a reconstruction of Proterozoic astronomical cycles, fundamental frequencies of the solar system, the precession constant, and the underlying geologic timescale, directly from stratigraphic data. Application of the approach to 1.4-billion-year-old rhythmites indicates a precession constant of 85.79 ± 2.72 arcsec/year (2σ), an Earth–Moon distance of 340,900 ± 2,600 km (2σ), and length of day of 18.68 ± 0.25 hours (2σ), with dominant climatic precession cycles of ∼14 ky and eccentricity cycles of ∼131 ky. The results confirm reduced tidal dissipation in the Proterozoic. A complementary analysis of Eocene rhythmites (∼55 Ma) illustrates how the approach offers a means to map out ancient solar system behavior and Earth–Moon history using the geologic archive. The method also provides robust quantitative uncertainties on the eccentricity and climatic precession periods, and derived astronomical timescales. As a consequence, the temporal resolution of ancient Earth system processes is enhanced, and our knowledge of early solar system dynamics is greatly improved.

Proterozoic Milankovitch cycles and the history of the solar system

Periodic variations in Earth’s orbit and rotation axis occur over tens of thousands of years, producing rhythmic climate changes known as Milankovitch cycles. The geologic record of these climate cycles is a powerful tool for reconstructing geologic time, for understanding ancient climate...

www.pnas.org

 

[ding]

Any conversation about earth's climate must begin with why the poles have different thresholds for glaciation. As it is northern hemisphere glaciation which is responsible for the ice age of the past 3 million years.

 

[ding]

Without plate tectonics isolating the polar regions from warm marine currents, Milankovitch Cycles didn't produce northern hemisphere glaciation.

 

[ding]

So arguing Milankovitch Cycles in a vacuum is meaningless. Milankovitch Cycles must be placed in their proper context to understand why the planet transitioned to our present icehouse world.

 

[Old Rocks]

Lot's of variables in that 4.5 billion year experiment that can't be accounted for, dummy.

Why not perform a laboratory experiment to quantify the associated temperature for varying concentrations of CO2?

In this experiment that we are currently running, the whole Earth is the lab, and we already have the answer from geological history.

"Carbon dioxide levels today are higher than at any point in at least the past 800,000 years. In fact, the last time the atmospheric CO₂ amounts were this high was more than 3 million years ago, during the Mid-Pliocene Warm Period, when temperature was 2°–3°C (3.6°–5.4°F) higher than during the pre-industrial era, and sea level was 15–25 meters (50–80 feet) higher than today."

Climate Change: Atmospheric Carbon Dioxide

In the past 60 years, carbon dioxide in the atmosphere has increased 100 times faster than it did during the end of the last ice age.

www.climate.gov

 

[ding]

In this experiment that we are currently running, the whole Earth is the lab, and we already have the answer from geological history.

"Carbon dioxide levels today are higher than at any point in at least the past 800,000 years. In fact, the last time the atmospheric CO₂ amounts were this high was more than 3 million years ago, during the Mid-Pliocene Warm Period, when temperature was 2°–3°C (3.6°–5.4°F) higher than during the pre-industrial era, and sea level was 15–25 meters (50–80 feet) higher than today."

Climate Change: Atmospheric Carbon Dioxide

In the past 60 years, carbon dioxide in the atmosphere has increased 100 times faster than it did during the end of the last ice age.

www.climate.gov

Not a valid experiment. Why not perform a controlled experiment in a lab?

 

[Old Rocks]

Not a valid experiment. Why not perform a controlled experiment in a lab?

LOL

 

[ding]

LOL

Why not perform a controlled laboratory experiment?

 

[Old Rocks]

Why not perform a controlled laboratory experiment?

As you have been told many times, that was done in 1859 by John Tyndall. It has been repeated many times. That you deny this is just what we expect from a victim of extreme Dunning-Kruger.

 

[ding]

As you have been told many times, that was done in 1859 by John Tyndall. It has been repeated many times. That you deny this is just what we expect from a victim of extreme Dunning-Kruger.

Not for varying concentrations to quantify the associated temperature of varying concentrations, dummy.

 

[Old Rocks]

Not for varying concentrations to quantify the associated temperature of varying concentrations, dummy.

Svante Arrhenius, 1896.

 

[skookerasbil]

But let's face it....some might find this stuff compelling...but how much of the public? 2%? Maybe 3%...maybe?

If 97% of the country is far more concerned about Brad Pitt hooking up with Jennifer Aniston, is this stuff anything more than a hobby for people living spectacularly boring lives? I think the answer is fairly obvious.

Big picture is....nobody cares.
It's the only thing that matters.

Go on any FACEBOOK feed and check on how much global warming is being discussed