If you think
of the precessional cycle as four seasons instead of just the 65N TSI peak, you have Hot Summer / Cold Winter, Warm Spring / Cool Fall, Mild Summer / Mild Winter Cool Spring / Warm Fall.
Earth eccentricity cycles modulate the amplitude
of precessional forcing of the African monsoonal rains (see upper right panel), and deep lake conditions are observed in several East African basins during some (not all) eccentricity maxima over the 5 Ma (deMenocal, 2011; Trauth et al., 2005; Kingston et al., 2007)
Actually, the oceans have a seesaw where the SH oceans warm more during this phase
of the precessional cycle.
Raymo and Paillard have a good story about the 100KYr cycle arising from the modulation
of the precessional cycle by the changes in the Earth's orbital eccentricity, coupled with some glacial dynamical effects which «rectify» the high frequency precessional signal.
Not exact matches
I am assuming the similarity
of the «low eccentricity and consequently weak
precessional forcing» in the current interglacial and during MIS 11.
The alignment
of obliquity and eccentricity due to precession is a much stronger effect than for the Earth, leading to «great» summers and winters on time scales
of tens
of thousands
of years (the
precessional period is 170,000 years).
The main changes in radiative forcing from the
precessional cycle are in the latitudinal and seasonal distribution, not in the global mean, which is why the nature
of the response can be expected to be different from doubling CO2.
The alignment
of obliquity and eccentricity due to precession is a much stronger effect than for the Earth, leading to «great» summers and winters on time scales
of tens
of thousands
of years (the
precessional period is 170,000 years).
The climate change in this period is generally believed to be associated with
precessional changes in the distribution
of solar radiation, which primarily affect land - sea temperature contrast, and give only a regional warming, plus an enhancement
of certain monsoonal circulations.
That would account for the relative strengths
of the obliquity and
precessional signals in the data.
You'd better hope that the rebound from the coldest depths
of the half
precessional Holocene was natural, because if man did the heavy lifting
of warming, then we really can't keep it up much longer.
The surface
of the oceans are always warmer than the depths
of the oceans > If you change the mixing efficiency, by shifting atmospheric circulations with solar
precessional cycle for example, the mixing efficiency changes and the regions where precipitation falls changes.
And the much longer term ice - age and magnetic cycles may well be regulated by the Earth's
precessional cycle (and this is not simply an effect
of «geometry»).
Extreme weather is the name
of the game when seven
of the past eight interglacials underwent glacial inception at their half
precessional ages.
The interglacial thus lasts an additional
precessional cycle, yielding a total duration
of 28 kyr.