File:Nilas Sea Ice1.jpg

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Nilas Sea Ice Buffin Bay Arctic. In calm water, the first sea ice to form on the surface is a skim of separate crystals which initially are in the form of tiny discs, floating flat on the surface and of diameter less than 2-3 mm. Each disc has its c-axis vertical and grows outwards laterally.

At a certain point such a disc shape becomes unstable, and the growing isolated crystals take on a hexagonal, stellar form, with long fragile arms stretching out over the surface. These crystals also have their c-axis vertical.

The dendritic arms are very fragile, and soon break off, leaving a mixture of discs and arm fragments. With any kind of turbulence in the water, these fragments break up further into random-shaped small crystals which form a suspension of increasing density in the surface water, an ice type called frazil or grease ice.

In quiet conditions the frazil crystals soon freeze together to form a continuous thin sheet of young ice; in its early stages, when it is still transparent, it is called nilas. When only a few centimetres thick this is transparent (dark nilas) but as the ice grows thicker the nilas takes on a grey and finally a white appearance.

Date
Source Own work; The image was taken from an icebreaker
Author Brocken Inaglory
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Nilas Sea Ice.JPG

Related images Nilas sea ice 2.jpgNilas sea ice 3.jpg

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current16:20, 29 March 2008Thumbnail for version as of 16:20, 29 March 20082,200 × 1,467 (2.27 MB)Mbz1 (talk | contribs){{Information |Description=Nilas Sea Ice [http://en.wikipedia.org/wiki/Sea_ice sea ice] w:Buffin Bay w:Arctic. |Source=self-made |Date= |Author= [http://home.comcast.net/~milazinkova/Fogshadow.html Mila Zinkova] |Permission= |other_versions= }} [
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