Figure 1. Melt against age (upper panel) and July insolation against age (lower panel) for the GISP2 site. Years containing melt features are shown by thin dotted lines. The heavier textured line is the 100-a running mean of melt frequency (number of melt features per 100 years), and the heavy black line is the 1000-a running mean. The lower panel shows deviation of July insolation from modern values in calories/cm2/day, from Berger (1978; 1979); positive values indicate more insolation than today. Data from: Alley, R.B. and S. Anandakrishnan. Variations in melt-layer frequency in the GISP2 ice core: implications for Holocene summer temperatures in central Greenland. Annals of Glaciology 21, 64-70 (1995)

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