From AMS Glossary
Revision as of 18:57, 25 April 2012 by Perlwikibot
(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.