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Keywords:

  • D-O cycles;
  • Nordic seas;
  • marine sediment core;
  • Greenland ice core;
  • abrupt changes;
  • sea ice

Multiple times in the Earth's past, the air over Greenland has warmed by 10°C or more in just a few decades before resetting over centuries. First discovered in the 1990s, these so-called Dansgaard-Oeschger (D-O) events are spurred by an unknown cause. Dokken et al. propose that D-O events are driven by cyclic interactions between sea ice and ocean circulation patterns in Nordic seas.