Fast ice

fast ice

(Also called landfast ice.) Sea ice that is immobile due to its attachment to a coast, usually extending offshore to about the 20-m isobath.

In protected bays and inlets, fast ice is smooth and level, typically reaching a thickness of between 2 and 2.5 m. Along exposed coastlines, fast ice may be greatly deformed.

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In meteorological literature, often used with particular reference to the disappearance of free electrons by their attachment to neutral oxygen atoms or molecules, thus forming negative ions.