Comparison With Other Greenland Ice Cores
For a map of the locations of the various Greenland ice cap corings, see .
To investigate the possibility of climatic cooling, scientists drilled into the Greenland ice caps to obtain core samples. The oxygen isotopes from the ice caps suggested that the Medieval Warm Period had caused a relatively milder climate in Greenland, lasting from roughly 800 to 1200. However from 1300 or so the climate began to cool. By 1420, we know that the "Little Ice Age" had reached intense levels in Greenland.
For most of the arctic ice cores up to 1987, regions of the core with high dust concentrations correlate well with the ice having high deformation rates and small crystal diameters, in both Holocene and Wisconsin ice.
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