50 year means of oxygen isotope data from ice core NGRIP, supplement to: North Greenland Ice Core Project Members (2004): High-resolution record of Northern Hemisphere climate extending into the last interglacial period. Nature, 431, 147-151

North Greenland Ice Core Project Members
Two deep ice cores from central Greenland, drilled in the 1990s, have played a key role in climate reconstructions of the Northern Hemisphere, but the oldest sections of the cores were disturbed in chronology owing to ice folding near the bedrock. Here we present an undisturbed climate record from a North Greenland ice core, which extends back to 123,000 years before the present, within the last interglacial period. The oxygen isotopes in the ice imply...
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