by K. Richard, July 29, 2022 in NoTricksZone

Dozens of rapid warming and cooling periods episodically occurred throughout the last glacial. However, they have often been dismissed as local-only events. A 2020 study published in Science robustly affirms steeper-than-today warming periods spanned both hemispheres and 23 of 25 were “globally synchronous.” 

Geologists have long recognized that Greenland abruptly warmed up by 5 to 16°C “within a few decades to centuries” about 25 times in the last ~100,000 years (Capron et al., 2021).

These past abrupt climate changes do not even require a clear external trigger to explain their provenance. They can simply be “unforced or noise-induced oscillations” internal to the climate system (Capron et al., 2021, Li and Born, 2019).

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