Can Iceberg Surges in the Arctic Trigger Rapid Warming at the Other End of The World?
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Study Unravels the Anatomy of Abrupt Ice Age Climate Changes
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13 APRIL 2021
The last ice age persisted for over 100,000 years. An ice-bound eternity by any stretch of the imagination, but this long winter was not completely frozen into stillness.
During the Last Glacial Period, which ended approximately 12,000 years ago, climate change existed as a powerful phenomenon, much as it does now, albeit for different reasons.
Over the course of the ice age, a series of abrupt warming episodes punctuated the coldness, each of them sending temperatures soaring (by up to 16 degrees Celsius) in temporary heat waves that flared for decades before disappearing.
These sudden phenomena, called Dansgaard-Oeschger events, took place dozens of times over the 100 millennia of the Last Glacial. But what was it that made them spark to life at all?
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Abrupt Ice Age Climate Changes Behaved like Cascading Dominoes
Throughout the last ice age, the climate changed repeatedly and rapidly during so-called Dansgaard-Oeschger events, where Greenland temperatures rose between 5 and 16 degrees Celsius in decades. When certain parts of the climate system changed, other parts of the climate system followed like a series of dominos toppling in succession. This is the conclusion from an analysis of ice-core data by a group of researchers that included postdoc Emilie Capron and associate professor Sune Olander Rasmussen from the Section for the Physics of Ice, Climate and Earth at the Niels Bohr Institute, University of Copenhagen, in Denmark.