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Tiny bits of iron may explain why some icebergs are green

Author: Jeremy Rehm / Source: Science News

green icebergs
GREEN SCENE Maybe only 30 out of 1,000 icebergs have a green hue, earning them the nickname “jade bergs.” Now scientists may know why the ice has this unusual color.

Scientists may have finally figured out why some icebergs are green. Iron oxides could create the emerald hue.

Icebergs often appear mostly white because light bounces off air bubbles trapped inside the ice. But pure ice — ice without air bubbles that often forms on a berg’s underside — appears blue because it absorbs longer light wavelengths (warm colors like red and orange) and reflects shorter ones (the cooler colors).

Since the 1930s, though, mysterious capsized icebergs with green undersides, nicknamed “jade bergs,” have been spotted around Antarctica.

In the early 1990s, glaciologist Stephen Warren of the University in Washington in Seattle and his colleagues proposed…

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