50 year means of oxygen isotope data from ice core NGRIP ...
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...
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| Format: | Dataset |
| Language: | English |
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PANGAEA
2007
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| Online Access: | https://dx.doi.org/10.1594/pangaea.586886 https://doi.pangaea.de/10.1594/PANGAEA.586886 |
| Summary: | 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 that climate was stable during the last interglacial period, with temperatures 5 °C warmer than today. We find unexpectedly large temperature differences between our new record from northern Greenland and the undisturbed sections of the cores from central Greenland, suggesting that the extent of ice in the Northern Hemisphere modulated the latitudinal temperature gradients in Greenland. This record shows a slow decline in temperatures that marked the initiation of the last glacial period. Our record reveals a hitherto unrecognized warm period initiated by an ... : The initial isotope data series is based on 5 cm continuous sampling from surface to bottom of the core, or 61100 individual measurements. The age model follows the GRIP2001/ss09sea timescale (Johnsen et al., 2001) ... |
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