It is fun playing with not standard methods in non-linear thermodynamics on a global scale, but there are not a lot of people that have a clue WTF I am talking about. So making some wild ass predictions that will be called "crack pot" ideas, is par for the course. So above is my latest crack pot theory, the 1940s to 1950s Super Duper La Nina event. The BEST Tmin data above shows very clearly the 1998 Super El Nino. In the blue I have highlighted my Super Duper La Nina.
The normal ENSO cycle is related to the changes in the westerly equatorial winds which increase (decrease) the polar current flow up the western coast of South America. With only a current 2 to 4 year ENSO cycle mainly in the warmer EL Nino sequence, there is not much change in the Circumpolar Current (CC). In a more prolonged negative of la nina ENSO mode, the CC could cause significant cooling of the Antarctic peninsular increasing the western sea ice extent. That increase would cause a more perminate disruption of the CC flow and a more persistent La Nina phase of ENSO. Voi La' Super Duper La Nina!
As crazy as that may sound it fits with the goofy rapid climate change events in the more distant past.
Here is the Western Caribbean with the Milankovic cycles and Antarctic CO2. The Western Caribbean temperatures are extremely stable until some event, and those events have a greater impact on Antarctic CO2 than the Milankovic cycles.
All good "crack pot" theories require more detail, so I will start exploring more regional reconstructions to dot the "i"s and mess with the "t"s here pretty some.