Greenland Ice May Exaggerate Magnitude of 13,000-Year-Old Deep Freeze
Monday, June 25, 2012 - 16:30
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.