Changes in Earth's tilt responsible for global cooldown, ice ages

HankDorsett

Gold Member
80
27
Summary
Recent study I've read
I came across an article regarding a study that claimed ice ages correspond with extreme changes in the tilt of the Earth. I'm curious what others think about this. Is this just another unqualified scientific study put out there to confuse the climate change debate? Is the science behind it accurate?
 

Vanadium 50

Staff Emeritus
Science Advisor
Education Advisor
23,320
5,686

phyzguy

Science Advisor
4,326
1,311
This is not a new idea, try looking up "Milankovitch cycles". However, I don't quite see how you could read the article and call +/- 1 degree changes in the Earth's tilt "extreme changes".
 
44
43
Summary: Recent study I've read

I came across an article regarding a study that claimed ice ages correspond with extreme changes in the tilt of the Earth. I'm curious what others think about this. Is this just another unqualified scientific study put out there to confuse the climate change debate? Is the science behind it accurate?
Milankovitch cycles are viewed as the trigger of those changes. But the rate of changes in temperature cannot be explained by the changes in solar radiation and in the seasons. Neither the Milankovitch cycles are matching exactly the temperature interpreted from ice cores. In fact to explain the changes, feedback cycles are involved. Notably ice-albedo, CO2 and water vapor feedbacks. So the current understanding is that changes in incoming solar radiation and in seasons are triggering changes in greenhouse gases and in ice cover, century after century.

Some scientific publications about this:
1984, Modelling the global climate response to orbital forcing and atmospheric carbon dioxide changes: https://www.nature.com/articles/310757a0
1993, Water vapour, CO2 and insolation over the last glacial-interglacial cycles: https://royalsocietypublishing.org/doi/pdf/10.1098/rstb.1993.0110
2006, Ice-driven CO2 feedback on ice volume: https://www.clim-past.net/2/43/2006/cp-2-43-2006.pdf
2011, The role of orbital forcing, carbon dioxide and regolith in 100 kyr glacial cycles: https://www.clim-past.net/7/1415/2011/cp-7-1415-2011.pdf

About the actual climate change, the Milankovitch (or orbital) parameters are changing in the direction of a cooling since the beginning of the Holocene (so for several millennia).
You can visualize here the changes: https://biocycle.atmos.colostate.edu/shiny/Milankovitch/

Edit: I add this review paper I just found.
2015, Quaternary glaciations: from observations to theories: http://www.science.earthjay.com/instruction/HSU/2015_fall/GEOL_553/discussions/discussion_03/QuatStrat_Discussion_Paper_Week4.pdf
 
Last edited:

phyzguy

Science Advisor
4,326
1,311
@Genava , in addition to this nice list of papers, I would also add the following paper:

2013, Insolation-driven 100,000-year glacial cycles and hysteresis of ice-sheet volume:

I think this paper does a very nice job of showing that, while the Milankovitch cycles are the main driver, other factors, like the rate of rebound of the continents after ice sheet melting, play significant roles as well.
 

HankDorsett

Gold Member
80
27
Thanks for all the responses, it's a lot to go over. All of this seems to prove my belief on climate change, climate science is way more complicated then led to believe.
 

phyzguy

Science Advisor
4,326
1,311
Thanks for all the responses, it's a lot to go over. All of this seems to prove my belief on climate change, climate science is way more complicated then led to believe.
Of course it's complicated. What reputable climate scientist ever said otherwise?
 

HankDorsett

Gold Member
80
27
Of course it's complicated. What reputable climate scientist ever said otherwise?
I wasn't referring to any reputable climate scientists. Most of what we hear about climate change is from non educated sources and unfortunately they only talk about one issue.
 
44
43
I wasn't referring to any reputable climate scientists. Most of what we hear about climate change is from non educated sources and unfortunately they only talk about one issue.
If you are looking for reliable sources with articles and explanations wrote by researchers, there are CarbonBrief and ClimateFeedback.
 

Want to reply to this thread?

"Changes in Earth's tilt responsible for global cooldown, ice ages" You must log in or register to reply here.

Related Threads for: Changes in Earth's tilt responsible for global cooldown, ice ages

  • Last Post
2
Replies
29
Views
7K
  • Last Post
Replies
18
Views
6K
Replies
5
Views
6K
Replies
5
Views
3K
Replies
6
Views
5K
  • Last Post
Replies
4
Views
6K
  • Last Post
Replies
0
Views
2K
  • Last Post
Replies
4
Views
2K

Hot Threads

Top