88 Cores descends two miles through the Greenland Ice Sheet in one continuous pan. This photo collage allows scrolling through an excerpt of these cores to a depth of -2137 meters. Ice cores are paleo-thermometers, buried signs of ancient time and temperature providing physical evidence of global climate change. These cores were drilled between 1989 and 1993 and are kept at the National Ice Core Lab in Colorado. The variation of the cores reflect the compression as a result of depth, but also the differences in scanning and storage since drilling. The markings and changes show the fragility of the excavated cores and echo the vulnerability of polar ice as the earth warms.
Original scans courtesy National Ice Core Lab/NSF