The formation of depth hoar in Arctic or Antarctic firn can cause isotopic changes in the accumulating ice.
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Sharing top billing in the rogues'gallery of weak layers is a wily meteorological entity known as " depth hoar ."
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File : LightLTSEM . jpg | Two images of the same depth hoar snow crystal, viewed through a light microscope ( left ) and as an SEM image ( right ).
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In a 32-degree Fahrenheit room in the Institute's field station, researchers Charles Fierz and Thorsten Baunach create depth hoar in a box to determine how quickly it grows under various snow and weather conditions.
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When a temperature gradient greater than 10 �C change per vertical meter of snow is sustained for more than a day, angular crystals called depth hoar or facets begin forming in the snowpack because of rapid moisture transport along the temperature gradient.
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