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Term: Old ice Class:  
 vernacular   (0%)
Created 6 June 2017
Last modified 6 June 2017
Contributed by GCW Glossary

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Definition: Sea ice more than 2-years-old, up to 3 meters (10 feet) or more thick; hummocks on old ice are even smoother than in second-year ice, and the ice is almost salt-free; when old ice is bare of snow, it is blue and lacks the greenish tint of second-year ice.  NSIDCCryosphere 

Sea ice that has survived at least one summer's melt. Most topographic features on old ice are smoother than those on first-year ice. May be subdivided into second-year ice and multiyear ice.  WMOSeaIce 

Sea ice which has survived at least one summer's melt; typical thickness up to 3m or more. It is subdivided into residual first-year ice, second-year ice and multi-year ice.  Bushuyev 

Sea ice terminology describing sea ice which has survived at least one summer's melt. The surface of old ice is generally smoother than first-year ice. Old ice may be subdivided into second-year ice and multi-year ice.  ECCCanada 

Sea ice more than two years old, up to 3 m or more thick. Hummocks on old ice are even smoother than in second-year ice, and the ice is almost salt-free. When old ice is bare of snow, it is blue and lacks the greenish tint of second-year ice.  SPRI 

 GCW 
Examples: