So cold the ice is blue

Blue Ice

Blue Ice, photo by HLHigham

You may have seen one or more of these incredible ice photos making the email round as Lake Michigan or Lake Huron ice. The article above says that they and many more were taken Antarctic base of Dumont D’Urville by Tony Travouillon in 2002. A shout-out to TC weatherman Joe Charlevoix who posted a story earlier in the week debunking the hoax!

While we don’t have that level of brilliant blue, our ice does get bluish. Via Shawn Malone at the Earth Science Picture of the Day, I found an informative article by Larry Gedney about blue ice & snow that says:

It is a common misconception that the blue color exhibited by glaciers, old sea ice, or even holes poked into a snow bank is due to the same phenomenon that makes the sky blue–light scattering. But nature has more than one recipe for producing the color blue. In frozen water and in the sky the processes are almost the reverse of each other.

A blue sky results when light bounces off molecules and small dust particles in the atmosphere. Because blue light scatters more than red does, the sky looks blue except in the direction of the sun (particularly when the sun is near the horizon and the blue light is scattered out of the sunlight, leaving the red color of sunrises and sunsets).

When light passes through ice, however, the red light is absorbed while the blue is transmitted. Were the operating process scattering as in the atmosphere, then the transmitted light would be red, not blue. However, because of the large size of snow grains and ice crystals, all wavelengths of visible light are scattered equally. Scattering therefore does not play an appreciable role in determining the color of the transmitted light.

It takes an appreciable thickness of pure ice to absorb enough red light so that only the blue is transmitted. You can see the effect in snow at fairly shallow depths because the light is bounced around repeatedly between ice grains, losing a little red at each bounce. You can even see a gradation of color within a hole poked in clean, deep snow. Near the opening, the transmitted light will be yellowish. As the depth increases, the corer will pass through yellowish-green, greenish-blue and finally vivid blue. If the hole is deep enough, the color and light disappear completely when all the light is absorbed.

The color of ice can be used to estimate its strength and even how long it has been frozen. Arctic Ocean ice is white during its first year because it is full of bubbles. Light will travel only a short distance before it is scattered by the bubbles and reflected back out. As a result, little absorption occurs, and the light leaves with the same color it had when it went in.

There’s more (lots more) on water, snow & ice from the University of Alaska, Fairbanks.

Heather took this photo at Point Betsie last weekend. View it bigger and see more in her Winter slideshow.

More science on Michigan in Pictures and speaking of ice, check out the ice caves off the Leelanau Peninsula in this mLive feature & video.

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