Antarctic Cold Reversal

The Antarctic cold relapse, abbreviated ACR ( for eng. Antarctic Cold Reversal ), was an important phase in the history of the earth, in which took place a global cooling in a time of global glacier melt at the end of the last ice age.

The letzteiszeitliche maximum and minimum sea-level took place 21,000 years BP. After 18,000 BP Antarctic ice cores show a gradual warming. Circa 14,700 BP there was a large meltwater pulse, which either came from the Antarctic ice sheet from the Laurentide ice sheet and or meltwater pulse 1A is called. This meltwater pulse caused a rise in sea level, which raised the global sea level within two centuries around 20 meters. It is believed that this influenced the beginning of the Bolling - interstadial or Alleröd, the big breaks in the glacial cold in the northern hemisphere were. In addition, the meltwater pulse 1A in Antarctica and the Southern Hemisphere has been accompanied by a renewed cooling phase, the Antarctic cold relapse, which began around 14,500 BP and lasted for two thousand years; it is an example of a heating, which led to a cooling. Was a similar trend in the Misox fluctuation. The Antarctic cold relapse brought an average cooling of about 3 ° C. The Younger Dryas began during the Antarctic cold relapse, which ended in the middle of the younger Dryas ..

This pattern of decoupling between the northern and southern hemisphere or " leads south, north lags behind " (English lead southern, northern lag) manifested itself in subsequent climatic events. The cause (s) of this decoupling Erdhemisphären and the mechanisms of heating and cooling trend is / are the subject of study and discussion in climate research. The specific timing and the extent of the Antarctic cold relapse are also the subject of this debate.

On the Antarctic cold relapse followed with approximately 800 years delay in the Oceanic cold relapse in the Southern Ocean.