The researchers use x-ray microtomography to create images that show different cross sections of the ice. The grey colour is ice, the white is air and the dark colour is brine. From upper left: young columnar ice (3 weeks); young granular ice (formed from snow); two-month-old ice; old ice after one or two summers(1.5-2.5 years); warmed young ice melting internally.
Lower right: A typical sample after it has been cut from a larger core.
(Picture: Sönke Maus, NTNU)
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