: Paléoclimatologie: blue ice

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blue ice

Blue ice occurs when snow falls on a glacier, is compressed, and becomes part of the glacier. During compression, air bubbles are squeezed out, so ice crystals enlarge. Water ice is blue for the same reason that large quantities of liquid water are blue: it is a result of an overtone of an oxygen–hydrogen (O−H) bond stretch in water, which absorbs light at the red end of the visible spectrum. (Adapted from: https://en.wikipedia.org/wiki/Blue_ice_(glacial))

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