Line-scan grey-scale intensity profile from the NGRIP2 ice core, Greenland

A continuous high-resolution record of digital images was obtained from the North Greenland Ice Core Project (NGRIP) ice core in the depth interval from 1330 m to the bedrock at 3085 m during the Greenland field seasons of 2000 and 2001. The images are obtained as dark-field images from an indirect light source and provide detailed visual documentation of the ice core at high depth resolution. The visual stratigraphy grey-scale intensity profile (the line-scan profile) is obtained as an averaged intensity profile from the centre part of the stratigraphy images along the direction of the core. The dataset covers the depth interval 1371.15-2425.00 m in 1 mm depth resolution and with grey scale values in the range of 0-255. The profile is unprocessed and includes all core breaks that give rise high intensity values that should be regarded as contamination. Furthermore, the profile suffers from an intensity saturation issue that is uncorrected for. Finally, the section 1371.15–1750 m depth is hampered by ice relaxation effects as this section of the core was overwintering in Greenland for one year prior to analysis. The dataset was applied to construct the glacial part of the GICC05 ice-core chronology. The analytical technique and the intensity profile are described in Svensson et al. (2005).