1500 Year warming Cooling Cycles
Posted by greg2213 on April 18, 2010
While reading some stuff on volcanoes and climate change, specifically Toba, I came across this Wiki article on Dansgaard-Oeschger events. D-O events are warming periods that appear in the Greenland ice cores. Temps warmed by as much as 8C over periods of around 40 years, then dropped again over the next couple hundred years.In the current interglacial these are referred to as Bond events.
These cycles don’t appear in the Antarctic ice cores, or if they do then they’re very subtle. This makes sense if the D-O events are caused by northern oceanic changes.
The little ice age of ~400 to 200 years ago has been interpreted by some as the cold part of a D-O cycle, putting us in a period of warming climate (Bond et al.. 1999).