- #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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In summary, changes in Earth's orbit have been found to drive long-term climate changes, which are amplified by changes in greenhouse gases such as CO2 and CH4, as well as changes in snow and ice coverage. The 100,000 year cycle of temperature is not always consistent, as it was once a 41,000 year cycle. It is still unclear what causes this shift and if there is a true 100,000 year cycle or a combination of shorter cycles. The 413,000 year cycle of eccentricity does not always correspond to changes in insolation or oceanic proxies, indicating that there may be other factors at play. This was one reason why the Milankovitch idea was challenged.
- #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
1. What causes the temperature cycles to occur?
The temperature cycles are primarily caused by natural variations in Earth's orbit and tilt, known as Milankovitch cycles. These cycles affect the amount and distribution of sunlight reaching Earth's surface, which impacts global temperatures.
2. How do these cycles affect the Earth's climate?
The temperature cycles can have significant impacts on Earth's climate, leading to periods of warming or cooling. These changes can affect weather patterns, sea levels, and the distribution of plant and animal species.
3. Are there other factors that contribute to these temperature cycles?
While Milankovitch cycles are the primary cause of the temperature cycles, there are other factors that can also play a role. These include variations in solar activity, volcanic eruptions, and changes in atmospheric composition.
4. How do scientists study these temperature cycles?
Scientists study temperature cycles by examining data from ice cores, tree rings, and other sources that provide records of Earth's past temperatures. They also use computer models to simulate how Earth's climate may have changed in response to different factors.
5. Will these temperature cycles continue in the future?
It is likely that these temperature cycles will continue in the future, as long as the factors that influence them remain unchanged. However, human activities, such as greenhouse gas emissions, can also impact Earth's climate and may affect the intensity and timing of these cycles.
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