FIGURE 3. Time series of ice volume and Northern Hemisphere subarctic surface air temperature between 1.5 and 0.5 Myr ago, across the MPT.
From the following article:
North American ice-sheet dynamics and the onset of 100,000-year glacial cycles
R. Bintanja & R. S. W. van de Wal
Nature 454, 869-872(14 August 2008)
doi:10.1038/nature07158
Left axis, ice volume; global, Eurasian (EAS) and North American (NAM) contributions are shown as black, red and dark blue curves, respectively. Right axis, Northern Hemisphere subarctic surface air temperature (green curve). Vertical black arrows depict inferred 100-kyr interglacials. Horizontal dark blue bars represent the first NAM ice volume minimum following a 100-kyr interglacial. The horizontal light blue line represents the 45 m.s.l.e. level beyond which the Cordilleran and Laurentide ice sheets in North America merged (Supplementary Information), which occurred only after 1 Myr ago. Orange lines connect maxima in global ice volume within a single 100-kyr glacial, highlighting increasing ice volumes during a glacial.
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