Mechanism could explain rapid, dramatic, cyclic Arctic warming



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.