- #1
keepitmoving
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at the end of these 100,000 year cycles of temperature, what causes the peak temperature to fall?
At the end of these 100,000 year cycles of temperature, what causes
- Thread starter keepitmoving
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SUMMARY
The discussion centers on the causes behind the decline in peak temperatures at the end of 100,000-year cycles, primarily driven by Milankovitch cycles. These long-term climate changes are influenced by variations in Earth's orbit, greenhouse gas concentrations (specifically CO2 and CH4), and changes in albedo due to snow and ice coverage. The conversation also highlights the historical variability of temperature cycles, noting a previous 41,000-year cycle and the complexity of the 413,000-year eccentricity cycle, which does not align with oceanic and ice core proxies.
PREREQUISITES- Understanding of Milankovitch cycles
- Knowledge of greenhouse gas effects on climate
- Familiarity with albedo and its impact on temperature
- Basic grasp of paleoclimate proxies, including benthic foraminifera and ice cores
- Research the mechanisms of Milankovitch cycles in detail
- Examine the role of greenhouse gases in historical climate changes
- Study the implications of albedo changes on global temperatures
- Investigate the discrepancies between insolation cycles and paleoclimate proxies
Climate scientists, geologists, and environmental researchers interested in understanding the long-term climate patterns and their underlying mechanisms.
- #2
DrClapeyron
http://en.wikipedia.org/wiki/Milankovitch_cycles"
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- #3
Xnn
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Changes in Earth's orbit normally drive long term climate changes (warming and cooling) and are amplified by changes in greenhouse gases (CO2 and CH4) along with changes in snow and ice coverage (albedo).
http://stephenschneider.stanford.edu/Publications/PDF_Papers/Ruddiman2003.pdf
BTW, it wasn't always a 100,000 year cycle. For a significant period of time, the temperature cycle was 41,000 years. It's not entirely clear what caused that shift or if there really is a 100,000 year cycle as opposed to a series of 82,000 and 123,000 year cycles that happen to average out at 100,000 years.
- #4
keepitmoving
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thanks.
- #5
Andre
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Not done yet,
Another problem is that the 413,000 years eccentricity cycle clearly shows up in the insolation cycles as amplitude modulation here, but it does not show up in the oceanic benthic foraminifera isotope proxies as well as the ice cores.
The graph shows that the total resulting solar forcing at 65 degrees north in the summer does not resemble the stages of glaciation a lot. Note especially that 400,000 years ago we see one of the biggest spikes in the glaciation together with the one of the least variation in summer forcing compared to 200,000 years ago when one of the strangest variation in summer forcing is seen together with only a small spike.
Apparantly there is some more to it, although this wasn't even the reason why Karner and Muller challenged the Milankovitch idea http://sciencemag.org/cgi/content/summary/288/5474/2143.
full text
Another problem is that the 413,000 years eccentricity cycle clearly shows up in the insolation cycles as amplitude modulation here, but it does not show up in the oceanic benthic foraminifera isotope proxies as well as the ice cores.
The graph shows that the total resulting solar forcing at 65 degrees north in the summer does not resemble the stages of glaciation a lot. Note especially that 400,000 years ago we see one of the biggest spikes in the glaciation together with the one of the least variation in summer forcing compared to 200,000 years ago when one of the strangest variation in summer forcing is seen together with only a small spike.
Apparantly there is some more to it, although this wasn't even the reason why Karner and Muller challenged the Milankovitch idea http://sciencemag.org/cgi/content/summary/288/5474/2143.
full text
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