Greenland ice may exaggerate magnitude of 13,000-year-old deep freeze
Monday, June 25, 2012 - 17:00
in Earth & Climate
Ice samples pulled from nearly a mile below the surface of Greenland glaciers have long served as a historical thermometer, adding temperature data to studies of the local conditions up to the Northern Hemisphere’s climate. But the method — comparing the ratio of oxygen isotopes buried as snow fell over millennia — may not be such a straightforward indicator of air temperature.