The Original and the Reversed Milankovitch Cycles comparison
This is the Reversed Milankovitch Cycle:
Axial precession is the movement of the rotational axis of Earth
What I have to complement is about the axial precession.
Axial precession is the movement of the rotational axis of Earth. According to the Milankovitch Cycle, precession has a cycle of roughly 21.170 years.
It is moving 1day every 58 years.
So we have 365 days * 58 years/day = 21.170 years
Precession doesn’t change the total amount of solar radiation that hits Earth.
But precession primarily alters the perihelion and aphelion.
Overall, this increases the seasonal differences from one hemisphere to the other.
The warming trend we observe now started some 6.500 years ago. It is a very slow process. The MWP ( the Medieval Warm Period ) is a confirmation of the existence of a long warming trend.
The LIA ( the Little Ice Age ) was observed as a colder atmosphere and more snowy winters. Also the glaciers were increasing.
On the other hand oceans continued accumulating heat.
It is a very long cycle. We are observing the Reversed Milankovitch Cycle culmination period. It will last about a millennia and a half and then there will be a cooling trend.
It is a culmination phase phenomenon.
It is similar to the common Solstice we observe every year.. Around Solstices the day is almost the same, only very tiny changes can be observed. It is a culmination time of a year. When day stops getting shorter and then it starts getting longer. A very slow and small changes can be observed.
The same with the 7.500 years long warming trend. It comes to its culmination now. First it will stop to get warmer, and then very slowly it will change to a cooling trend.
But as I have said it is a very long and a very slow process. It will take some 1.500 years to complete.
That is why I say there is an orbital forced Global Warming Trend.
It is the 21.170 years long Milankovitch Cycle.
Only the Milankovitch Cycle should be read Reversed !
8.000 years ago Earth’s global temperatures were at some minima
This above graph confirms the Reversed Milankovitch cycle the current warming trend, and that 8.000 years ago Earth’s global temperatures were at some minima.
The oceanic temperatures were lower at the time (8.000 years ago) and therefore oceanic waters’ CO2 solubility was much higher. Thus the CO2 concentration in atmosphere was at its lowest.
Also this explains the observed in the graph the gradual lowering of the CO2 content prior 11.000 years ago, when, in accordance, Reversed Milankovitch cycle shows the 11.000 yeas ago existing cooling trend.
The faster a planet rotates (n2>n1) the higher is the planet’s average (mean) temperature T↑mean:
Tmin↑→ T↑mean ← T↓max