Subj : ES Picture of the Day 09  2022
To   : All
From : Dan Richter
Date : Wed Mar 09 2022 11:00:32

 EPOD - a service of USRA

The Earth Science Picture of the Day (EPOD) highlights the diverse processes
and phenomena which shape our planet and our lives. EPOD will collect and
archive photos, imagery, graphics, and artwork with short explanatory
captions and links exemplifying features within the Earth system. The
community is invited to contribute digital imagery, short captions and
relevant links.


 Ice Blade in Bucket

   March 09, 2022

    IceSail_20220111_083516 (003)

   Photographer:  Pierre Renoult

   Summary Authors:  Pierre Renoult;  Jim Foster

   Imagine my surprise when one morning earlier this winter I found a
   large piece of ice protruding from a bucket of water left out overnight
   on the terrace of my home, in Aurillac, France. The day before it
   rained most of the day, and then the sky cleared allowing overnight
   temperatures to plummet below the freezing point. By the next morning,
   I couldn’t open my mailbox as it was frozen. This protrusion had an
   obvious slope and was about 16 inches (40 cm) in length.

   Once the sky cleared, fast freezing or “ supercooling” of the water
   in the bucket took place. When water is confined in small places, such
   as a pool or a bucket, the water freezes first along the edges and so
   water in the center is slightly raised with respect to the sides. As
   ice  expands beneath the surface it forces out the remaining liquid
   through the hole at center. This is where the hollow ice blade emerged.
   Different shapes can be observed, including spikes, sails and
   needles. The size of the pool of water, just how it’s confined, and
   differential freezing rates all play a role in determining if
   protrusions will form and just what shape they'll take.

   It’s worth noting that because ice expands in  crystalline planes,
   protrusions commonly occur at similar angles, typically about 60
   degrees to the ice-covered surface. If you have a  frost-free
   freezer, maybe you've noticed that sharp spikes sometimes form on ice
   cubes. Photo taken on January 11, 2022.
     * Aurillac, France Coordinates: 44.9310, 2.4450

Related EPODs

    Ice Blade in Bucket  Archive - Heart-Shaped Opening of a
   Michigan Ice Cave  Archive - Rupturing of Perito Moreno Glacier
   Bridge  Plate Crystal with Simple Extensions  Archive - Deep Blue
   Abyss on Godwin's Glacier  Archive - Frost Crystal Congregation
    More...

Cryosphere Links

     *  Guide to Frost
     *  What is the Cryosphere?
     *  Bentley Snow Crystals
     *  Glaciers of the World
     *  Ice, Snow, and Glaciers: The Water Cycle
     *  The National Snow and Ice Data Center Google Earth Images
     *  Snow and Ice Crystals

-
   Earth Science Picture of the Day is a service of the  Universities
   Space Research Association.

https://epod.usra.edu
 
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