2015-05-05. Ice cores show 200-year climate lag.

posted May 6, 2015, 6:32 PM by Alan Gould
By Stephanie McClellan, BBC News. For GSS Life and Climate chapter 10, Climate Change chapter 4. Excerpt: Scientists have found a 200-year lag time between past climate events at the poles. The most detailed Antarctic ice core provides the first clear comparison with Greenland records, revealing a link between northern and southern hemisphere climate change. ...abrupt and large temperature changes first occurred in Greenland, with the effect delayed about 200 years in the Antarctic. The study appears in Nature journal. ...In the 1990s, scientists took ice cores from Greenland that revealed very abrupt and large swings in temperature approximately 20,000 to 60,000 years ago. But it wasn't clear how this influenced global climate change. The 3,405 metre-long ice core, taken from the centre of West Antarctica, is the longest high resolution ice core. Researchers documented 18 abrupt climate events. "This record has annual resolution, meaning we can see information about every year going back 30,000 years, and close to that resolution all the way back to 68,000 years ago," explains Eric Steig, professor of Earth and Space Sciences at the University of Washington, who co-wrote the paper.... http://www.bbc.com/news/science-environment-32599228 0