The Daily Croissant

Eclectic Perambulations in the Noosphere

  • Flying Through a Crack in the Ice

    • 11 Mar 2012
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    • Animation Antarctica Flight Glaciers March 11 2012 Rifts
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    "In October 2011, researchers flying in NASA’s Operation IceBridge campaign made the first-ever detailed, airborne measurements of a major iceberg calving event while it was in progress. Four months later, the IceBridge team has mapped the crack in Antarctica’s Pine Island Glacier in a way that allows glaciologists and the rest of us to fly through the icy canyon.

    The above image is a still frame captured from a three-dimensional, virtual flight through the new rift in the Pine Island Glacier."

    via earthobservatory.nasa.gov

     

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  • Scalloped Blue Ice

    • 6 Nov 2011
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    • 05November11 Glaciers Ice Light color
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    by John Adam  

    "The photo above shows a chunk of scalloped ice, about 65 ft in width that broke off from the Sawyer Glacier near Tracy Arm Fjord in southeastern Alaska. Note the pure blue color emanating from within the “chasm.” The mechanism responsible for producing this robin’s egg blue color, as well as the blue color in deep snow, is essentially the same as that giving deep water its blue color. The longer wavelengths (yellow and red light) present in the incident white sunlight are preferentially absorbed by ice crystals. As a result, what we see is what’s not absorbed -- reflected light that’s dominated by the green and blue portion of the spectrum. In general, the thicker the ice the greater the absorption, and thus the bluer the color."

    via epod.usra.edu

     

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  • Antarctica Ice on the Move...

    • 27 Aug 2011
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    • 26August11 Antarctica Flow Glaciers Ice
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    Scientists have produced what they say is the first complete map of how the ice moves across Antarctica.

    Built from images acquired by radar satellites, the visualisation details all the great glaciers and the smaller ice streams that feed them.

    to see  animation click image or via bbc.co.uk

     

     

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