The shallow core 4B was drilled to 174 m 8 km upstream from DYE-3 (DYE-3 main core position: 65.18N, 43.83W). The exact position is not available. The delta-18O data were all measured immediately after the 1983 drilling operation. The delta-18O data uncertainty is 0.1 per mil. The samples are cut to achieve an average resolution of 8 samples per year, i.e. the depth resolution increases with depth (as annual layers thin). All sample depths are for the bottom of each sample.