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Home → Features → Natural Sciences → Geology and Paleontology → Planet Earth

Antarctica’s amazing striped icebergs

Not all icebergs are white and pure.

Mihai Andrei by Mihai Andrei
April 30, 2023
in Great Pics, Planet Earth

When you think of Antarctica, pristine white icebergs usually come to mind; probably the last thing you’d expect is humbug-like striped icebergs, with blue, green, yellow, and even brown — and yet, that’s exactly what you can spot in some parts of the Antarctic.

The different colors can form in various different conditions, but generally speaking, they appear because some layers of ice form in special conditions. For instance, blue stripes are the most common, and they appear when crevices are filled with water and they freeze so fast that no bubbles are formed. Conditions change, and some of the ice is deposited ‘normally’, and other times it is deposited in the no-bubbles fashion, creating the alternation we see here.

However, things are different with the other ones.

Green appears because the water that freezes is extremely rich in algae, hence the color. Brown, yellow, and even black stripes are caused by sediments picked up along the way when the ice sheet was sliding downhill.

Regardless of the color, however, there’s a variation in how the ice is deposited. Sometimes, there’s one color and one stripe, other times, there are multiple colored stripes.

Striped icebergs are not exactly rare, but quite uncommon still. It was Norwegian sailor Oyvind Tangen, on board a research ship that first photographed and described these glaciers (from what I was able to find, I’m not quite sure however). Anyway, they’re an astonishing sight by any standards, and it’s easy to understand why sailors have pictured them as humbugs. If you’re ever lucky enough to go to Antarctica, keep an eye out – you just might see one of these awesome wonders!

Picture sources 1 2 3 4 5 6 7

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