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| Photo © Alex Cornell. |
Icebergs are white, right? Well, no, not completely. As seen in this shot
(above) of a recently-flipped iceberg, their undersides can come in
spectacular shades of blue and green. The photograph was captured in
Cierva Cove, Antarctica, by videographer Alex Cornell during a family vacation. “[It] had this arresting alien-green color to it,” Cornell said of the iceberg in an interview with Universe Today. “It looked a lot more like a parked spacecraft than a floating iceberg.”
When icebergs look white, it is because compressed snow at their
surfaces contain large numbers of tiny air bubbles and other reflective
particles that tend to reflect all wavelengths
of visible light equally. When ice gets compressed—such as when it is
trapped under water—the air bubbles and other reflective particles get
squeezed out and washed away, leaving purer ice behind. When light
encounters pure ice, it can penetrate deep into it rather than
reflecting off the surface. As light moves through ice, longer
wavelengths (red and yellow) tend to be absorbed most readily, leaving
shorter-wavelength green and blue light to reflect back. This “leftover”
blue and green light is what gives the undersides of icebergs their
remarkable color.
As impressive as it is to see a close-up view, spotting blue ice is not that uncommon. In 2012, we published an aerial photograph with a striking patch of blue ice. Blue ice also shows up regularly in satellite imagery, such as this image acquired by the Advanced Land Imager on EO-1 in 2011.
To learn more about the color of icebergs, check out these stories from WebExhibits, the National Snow & Ice Data Center, and Seed. PetaPixel has also published an interesting guest blog post
in which Cornell explains how he produced and distributed the
photographs from start to finish. You can find more shots of the flipped
berg on his website and Instagram page.
Cornell’s images were not the only jaw-dropping iceberg photographs I noticed this week. On Tuesday, Antarctic Sun editor Peter Rejcek pointed out that the U.S. Antarctic Program had added several new iceberg photographs to their photo library. The images below
show an overturned iceberg (with some penguins on top) that contains
centuries of windblown sediments and minerals. It really is the stuff of
dreams.
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| Photograph by Ethan Norris, National Science Foundation. |
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| Photograph By: Ethan Norris, National Science Foundation |
Source : nasa
