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Is This Enough Forcing?
Some say that these effects are not strong enough
- The periodicity clearly aligns
- Magnitudes seem unexpected
- 96K is weak, but appears dominant recently
- Several 41K peaks have aligned with 96K minimums
- This mitigates the magnitude of the 41K effects
There is a feedback effect at work
- Hemispheric asymmetry and ice amplification
Notes:
The primary objection to this analysis is that the energy differences from orbital variability don't seem to be enough to cause the observed temperature swings and that some kind of amplification is required. Those who assume AGW claim this amplification comes from feedbacks reinforcing temperature changes caused by CO2 changes. An amplification mechanism is present, but it's definitely not CO2 related.
There are 2 things to consider. First, is that while each effect on it's own may not be very strong, the combined effects can be quite large.
Second, is that the argument against this forcing mechanism assumes that orbital variability cancels over a year as the northern and southern hemisphere seasonal influences average out. However, there's substantial asymmetry in the response of the hemispheres to energy changes and it's this which provides the required amplification.